OB 6 Operation Manual

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Operation Manual

Operation Manual
Version 1.0
March 2016

Dave Smith Instruments LLC
1527 Stockton Street, 3rd Floor
San Francisco, CA 94133
USA

This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference received, including
interference that may cause undesired operation.

This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.

Cet appareil numerique de la classe B respecte toutes les exigences du
Reglement sur le materiel brouilleur du Canada.

For Technical Support, email: support@davesmithinstruments.com

Table of Contents

A Few Words of Thanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Sound Banks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Editing Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comparing an Edited Program to its Original State. . . . . . . . . . . . . . .
Creating a Program from Scratch. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Live Panel Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving a Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canceling Save. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Moving to the Next Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2
2
3
3
4
4
5
6
7

Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Global Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Globals - Top Row . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Globals - Bottom Row. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Oscillator Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Detune . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mixer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Filter Envelope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Changing the Filter Envelope’s Response Curve. . . . . . . . . . . . . . . . 24

Loudness Envelope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Effects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Effects Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Low Frequency Oscillators. . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
X-Mod. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
X-Mod Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Arpeggiator Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Sequencer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Programming the Sequencer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Sequencer Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Portamento. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Unison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Using Chord Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Canceling Save. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Comparing Before You Save . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Globals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Pitch and Mod Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Pitch Wheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Modulation Wheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Aftertouch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Exporting Programs and Banks. . . . . . . . . . . . . . . . . . . . . . . . . 59
Calibrating the OB-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
How and When to Calibrate the Oscillators and Filters . . . . . . . . . . . 60
Calibrating the Pitch and Mod Wheels. . . . . . . . . . . . . . . . . . . . . . . . 61
Resetting the Global Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Using USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Appendix A: Alternative Tunings. . . . . . . . . . . . . . . . . . . . . . . . 63
Appendix B: Troubleshooting and Support . . . . . . . . . . . . . . . 67
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Contacting Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Warranty Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Appendix C: MIDI Implementation. . . . . . . . . . . . . . . . . . . . . . . 71
MIDI Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NRPN Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control NRPN Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sysex Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packed Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

72
76
80
80
83

Credits and Acknowledgements
Sound Design
Cyan Assiter-Clark, Daniel Davis, Peter Dyer, Peter Gorges, Tim Koon, Kurt
Kurasaki, Kevin Lamb, Peter Mahr, Cord Mueller, Drew Neumann, Bob Oxley,
Robert Rich, Matia Simovich, James Terris, Mitch Thomas, Taiho Yamada,
Lorenz Rhode
The DSI Crew
Fabien Cesari, Bob Coover, Carson Day, Chris Hector, Tony Karavidas, Mark Kono,
Justin Labreque, Andy Lambert, Andrew McGowan, Joanne McGowan, Tracy Wadley,
and Mark Wilcox.
Special thanks to Tom Oberheim. Thanks also to Robert Rich for the alternative
tunings content.

A Few Words of Thanks
Thank you for purchasing the OB-6. It’s an awesome-sounding synthesizer and
we’re very proud of it, and I’m very proud to have been able to co-create it with
my old friend, Tom Oberheim.
I’ve known Tom since the late 1970’s when we both shared the heady experience
of creating and selling some of the very first polyphonic synthesizers through
our respective companies, Sequential Circuits and Oberheim Electronics. Back
in those days, people were typically in either the Prophet or the Oberheim camp,
and though we were competitors, we were always friendly competitors, and have
remained good friends ever since.
Now, many years later, with the analog synth revival, Tom and I are again
making the instruments that we love. After I reacquired the Sequential brand and
released the Prophet-6 — and saw how much people liked it — the DSI gang and
I thought it would be fun to work with Tom to help bring back his classic SEMbased polyphonic sound in a modern format. So we did. And the result is the very
synth that you’ve just unboxed.
The OB-6 takes the best qualities of Tom’s classic SEM-based synths and adds some
nice touches that the originals never had, such as stereo outputs, velocity and aftertouch sensitivity, dual digital effects, a polyphonic step sequencer, an arpeggiator, and
of course, MIDI. The result is a modern classic: Pure vintage analog tone with the
reliability of a state-of-the-art, modern instrument.
Working together to bring you the OB-6 has been a real pleasure. We hope you
enjoy it and make some great music with it!
Cheers,

Getting Started
The OB-6 is a six-voice, polyphonic analog synthesizer with voltagecontrolled oscillators, filters, and amplifiers. It was designed to provide
all of the warmth, punch, and presence of a classic, SEM-based Tom
Oberheim synthesizer, with the added convenience and stability of a stateof-the-art, modern instrument.
All of the sound-shaping controls of the OB-6 are accessible on its front
panel, packing a tremendous amount of power and versatility into a
compact, easy-to-use format.
Each of the OB-6’s parameters are explained in later sections of this
manual. But don’t hesitate to dive right in and start turning knobs and
pressing buttons before you begin reading. You can always get back to
where you started, even if you have no idea what you’re doing. So start
exploring and keep your ears and mind open!
PHONES

LEFT

RIGHT

LP FILTER

TAP TEMPO

X-MOD
FILTER ENV

AMOUNT

VOLUME

SUSTAIN SEQUENCER

CLOCK

MODULATION
AFTERTOUCH

BPM

MIDI THRU

FREQUENCY

MIDI OUT

MIDI IN

USB

ARPEGGIATOR
VALUE

ON/OFF

OCTAVES

LFO
VCO 2

SEQUENCER

MODE

RECORD

EFFECTS

PLAY

ON/OFF

EFFECT

TYPE

MIX

CLK SYNC

SINE

SAWTOOTH

REV SAW
SQUARE

OSCILLATORS

RANDOM

VCO 1

VCO 2

VCO 1

LFO AMT

LOUDNESS

PW 1

SHAPE 1

LFO SYNC

SHAPE

MIXER

VCO 1

INITIAL AMT

FREQUENCY

FILTER

ENVELOPES

VCO 2
SYNC

FILTER ENVELOPE

DETUNE

LOW FREQ

VCO 1

VCO 2

PULSE WIDTH

KEYBOARD

SUB OCTAVE

NOISE

FREQUENCY

OUTPUT

FREQUENCY

RESONANCE

ATTACK

DECAY

SUSTAIN

RELEASE

ATTACK

DECAY

SUSTAIN

RELEASE

AMOUNT

PAN SPREAD

PRGM VOL

VELOCITY

VCO 1

VCO 2

PULSE WIDTH
PULSE WIDTH
1

FILTR FREQ FILTR MODE

AMP

NOTCH

TRACK

AMOUNT

MASTER VOLUME

FILTR FREQ FILTR MODE

VELOCITY

HALF FULL

LOUDNESS ENVELOPE
Decrement

TRANSPOSE

WHL RANGE

HOLD

RATE

PORTAMENTO

KEY MODE

DETUNE

UNISON

BANK

BANK PROGRAM

Increment

Transpose

MIDI Clock

Clock Port

TENS

Local Ctrl

Master Tune MIDI Channel
Seq Jack

Pot Mode

Sustain +/-

Alt Tuning

SELECT

MIDI Control

MIDI SysEx

Vel Response AT Response Stereo/Mono

Param Xmit

Param Rcv

Pgm Dump

MIDI Out

WRITE

GLOBALS

MANUAL

SELECT

PITCH

MOD

OB-6 front panel

OB-6 Operation Manual

Getting Started

Sound Banks
The OB-6 contains a total of 1000 programs. 500 are permanent and
500 can be overwritten. Banks 0-4 are User Banks that can be overwritten. Banks 5-9 are Factory Banks that are permanent. You can edit the
programs of either bank, but you can only save them to Banks 0-4. As
shipped from the factory, presets 000-499 are identical to 500-999.
Decrement

BANK

BANK PROGRAM

SELECT

Increment

Transpose

MIDI Clock

Clock Port

TENS

Local Ctrl

Master Tune MIDI Channel
Seq Jack

Pot Mode

Sustain +/-

Alt Tuning

SELECT

Param Xmit

Program bank, tens, and number selectors

Selecting Programs
Use the bank, tens, and program selector buttons to select and recall
programs.
To choose a program:

1. Press a program selector button (0-9) to specify the “ones” digit of the
program.
2. Hold down the tens button then press a program selector button (0-9)
to specify the “tens” digit of the program.
3. Hold down the bank button then press a program selector button (0-9)
to specify the “hundreds” bank of the program.
To choose program 123, for example:

1. Hold bank and press 1. Then release the bank button.
2. Hold tens and press 2. Then release the tens button.
3. Press program selector button 3.

Holding down the decrement button and pressing the increment button
advances the program number by 1 value. Conversely, holding down the increment
button and pressing the decrement button decrements the program number by 1 value.
This is especially useful for going between Tens, as you can wrap around to the next
set.

Getting Started

Param Rcv

Vel Response AT Response Ste

Dave Smith Instruments

It’s not always necessary to enter all 3 digits of a program number to
recall it.
For example:

•

If the current program is 100 and you want to recall program 101,
simply press “1.”

•

If the current program is 100 and you want to recall program 110, hold
down the tens button and press “1.”

•

If the current program is 100 and you want to recall program 115, hold
down the tens button and press “1.” Then release the tens button and
press “5.”

Pressing the globals button three times in a row saves the current program as
the default program that appears when you turn on the OB-6.

Editing Programs
Because all of the sound-shaping controls of the OB-6 appear on its front
panel, editing an existing program is simple: just turn a knob and listen to its
effect. Keep turning knobs and pressing buttons and if you like what you’ve
created, save the program. (See “Saving a Program” on page 5.)

The rotary controls on the front panel are a mixture of “endless” rotary encoders
and potentiometers or “pots.” You can choose between three different modes that
determine how the synth reacts when parameters are edited with a pot. For details,
see “Pot Mode” on page 13.

Comparing an Edited Program to its Original State
When editing a program, it’s often useful to compare its edited state to
its original state to evaluate your edits. Alternatively, before saving a
program to a new location you may want to check the program in the
target location before you overwrite it.
To compare an edited program to a saved version:

1. Edit a program.
2. Press the write button. It starts flashing.
OB-6 Operation Manual

Getting Started

3. Press the global button. Both LEDs on the button light up, indicating
compare mode.
4. Play the keyboard to hear the saved version of the sound.
5. To disable the compare function and return to the edited sound, turn off
the global button. Programs can’t be written while in compare mode.
6. If you want to save the edited sound, the write button is still flashing and ready to save, so enter a location with the program selector
buttons. The sound is saved.
7. Alternatively, if you want to cancel saving and continue editing, press
the write button. It stops flashing and saving is canceled.

When you’re editing a preset, the OB-6 has a convenient way of indicating the
programmed (saved) value for any knob parameter: Whenever you turn a knob and
reach the saved value of the parameter, an LED dot in the main OB-6 display will
illuminate.

Creating a Program from Scratch
An existing program can be very useful as a jumping off point for new
sounds. But it’s also useful (and educational) to create a new sound from
scratch. The OB-6 makes this easy by providing a “Basic Preset” that
you can quickly recall at any time. This preset is very simple, with a
single oscillator as its basis.
To recall the Basic Preset:

1. Hold down the manual button.
2. Press the write button.

Getting Started

Dave Smith Instruments

Live Panel Mode
The OB-6 also features a “live panel” mode in which its sound switches
to the current settings of its knobs and buttons. In other words, the current
preset is ignored and what you see on the front panel is what you hear. This
is a great mode for learning, experimentation, and instant gratification.
To enter live panel mode:

•

Press the manual button to toggle it on. Note that you can’t change
programs or banks with manual on.

To return to preset mode:

•

Press the manual button again to toggle it off.

MANUAL

Toggling on the manual button enables “live panel” mode

Be aware when entering live panel mode that the current settings of the OB-6
knobs and switches may be such that no sound is produced. This could be because
the Mixer levels are all set to zero, or some other reason. See Appendix B: Troubleshooting and Support for a checklist that can help you identify the cause.

Saving a Program
If you’ve created a sound that you like, you’ll probably want to save it.
Saving a program overwrites a previously saved program. Sound designers often save many incremental versions of a program as they continue
to refine it. These intermediate versions often make good jumping off
points for new sounds.
To save a program to the same preset location:

1. Press the write button. Its LED begins blinking.
2. Press a program selector button (0-9) to specify the “ones” digit of the
program.
3. The write button LED stops blinking and the program is saved.

OB-6 Operation Manual

Getting Started

Be careful when write is enabled. You can change banks and tens without
executing write, but once you press a program selector button (0-9) for the “ones”
digit, the write command is executed and the program at that location is overwritten.

To save a program to a different bank location:

1. Press the write button. Its LED begins blinking.
2. Hold down the bank button then press a program selector button to
specify the “hundreds” bank of the program. You can only save to
Banks 0-4.
3. Hold down the tens button then press a program selector button (0-9)
to specify the “tens” digit of the program.
4. Press a program selector button (0-9) to specify the “ones” digit of the
program.
5. The write button LED stops blinking and the program is saved.

Canceling Save
Sometimes you may want to cancel saving a program before you
commit.
To cancel the Save process before you commit:

•

If the write button LED is flashing, press it again. The LED stops flashing and saving is canceled. You can return to editing if you want.

Getting Started

Dave Smith Instruments

Comparing Before You Save
Before saving a program to a new location, it’s a good idea to listen to the
program in the target location to make sure you really want to overwrite it.
To evaluate a program before you overwrite it:

1. Get ready to save by pressing the write button. It starts flashing.
2. Press the global button. Both LEDs on the button light up, indicating
compare mode.
3. Use the program buttons to navigate to the sound you want to compare
and play the keyboard to hear the sound.
4. To disable the compare function and go back to the edited sound, turn
off the global button. Programs can’t be written while in compare
mode.
5. If you want to save the edited sound, the write button is still flashing
and ready to save, so enter a location with the program buttons. The
sound is saved.
6. Alternatively, if you want to cancel saving and continue editing, press
the write button. It stops flashing and saving is canceled.

Moving to the Next Level
Before you start exploring the sound creation capabilities of the OB-6
we’d like to point you toward a few things that will help you tailor the
instrument to your needs.
First, check out the Global Settings section of this manual. Read about
Pot Modes and determine which works best for you when you’re editing
sounds. You’ll also find information about MIDI setup. Read this to more
effectively integrate the OB-6 into your MIDI rig. To get the most out of
the OB-6’s live performance capabilities, read up on using a footswitch
or expression pedal.
And finally, be on the lookout for tips and notes scattered throughout
this manual to gain a better working knowledge of the OB-6. The better
you know it, the more you’ll get out of it. We wish you many hours of
musical exploration!

OB-6 Operation Manual

Getting Started

Connections

1. AC Power Connector—Accepts a standard, grounded IEC power
cord. Operates over a range of 100 to 240 volts and 50 to 60 Hz.
2. USB—For bidirectional MIDI communication with a computer. The

OB-6 is a Class Compliant USB device and does not require additional
drivers when used with Mac OS or Windows. See Using USB on page
62 for more information.

3. MIDI In, Out, and Thru—Standard 5-pin MIDI DIN connectors.
4. Footswitch-Sequence—Accepts a momentary, normally open or
normally closed footswitch to turn the sequencer or arpeggiator on and
off. Alternatively, an audio signal connected to this jack can be used to
either control sequencer/arpeggiator playback, or to gate the filter and
loudness envelopes while notes are held. See “Seq Jack” on page 13
for more information about choosing the appropriate mode for these
behaviors.

Audio signals used to drive the arpeggiator/sequencer should not exceed 5
volts peak-to-peak.

5. Footswitch-Sustain—Accepts a momentary, normally open or
normally closed footswitch to control sustain. See Sustain” on page
14 for more information.

Connections

Dave Smith Instruments

6. Expression Pedal-Volume—Accepts a standard expression pedal
that has a variable resistor on a TRS (tip-ring-sleeve) ¼ inch phone plug.
Once connected, you can use the pedal to control volume to add expressiveness and dynamics to live performance.
7. Expression Pedal- Filter—Accepts a standard expression pedal that
has a variable resistor on a TRS (tip-ring-sleeve) ¼ inch phone plug.
Once connected, you can use the pedal to control the cutoff frequency of
the filter to add expressiveness to live performance.
8. Audio Outputs—Unbalanced, ¼ inch audio outputs. The OB-6
sounds great in stereo, but can be switched to mono if needed. See
“Mono/Stereo” in Global Settings on page 14.
9. Headphones—A ¼ inch stereo headphone jack. Headphone volume is
controlled by the master volume knob on the front panel.

OB-6 Operation Manual

Connections

Global Settings
Global settings are parameters that affect all programs. These include
settings such as Master Tune, MIDI Channel, MIDI Clock, and others.
Global parameters are printed above the numeric program selector
switches (0 - 9). Use the Globals switch to choose between the two sets.
The red LED indicates that the upper row is active. The yellow LED
indicates that the lower row is active
GLOBALS

The Globals button

Transpose

MIDI Clock

Clock Port

Local Ctrl

Master Tune MIDI Channel
Seq Jack

Pot Mode

Sustain +/-

Alt Tuning

Param Xmit

Param Rcv

Globals 0-4

Clock Port

Alt Tuning

MIDI Control

MIDI SysEx

Vel Response AT Response Stereo/Mono

Param Xmit

Pgm Dump

Param Rcv

MIDI Out

Globals 5-9
Decrement

BANK

Increment

BANK PROGRAM

SELECT

TENS

SELECT

Use the Bank and Tens buttons to scroll forward and backward, respectively, through parameter settings

Global Settings

Vel Response AT Response S

Dave Smith Instruments

To set a Global parameter:

1. Press the globals button. Pressing it once activates the upper set of
parameters. Pressing it a second time enables the lower set of parameters.
2. Press the program selector button (0 - 9) that corresponds to the desired
parameter. The parameters are printed above each switch.
3. Use the bank and tens buttons as decrement and increment buttons to
step through available settings.
4. Once you’ve chosen the desired setting, press the globals button again
to exit.

Globals - Top Row
0. Transpose: -12…12—Master Transpose control, 0 is centered. Steps

in semitones up to one octave up (+12) or down (-12).

1. Master Tune: -50…50—Master Fine Tune control; 0 centered. Steps

in cents as much as a quarter-tone up (+50) or down (-50).

2. MIDI Channel: All, 1…16—Selects which MIDI channel to send and
receive data, 1 to 16. all receives on all 16 channels.
3. MIDI Clock: Sets the OB-6’s ability to send and receive MIDI clock

messages:
•

Off: MIDI Clock is neither sent nor received

•

Out: MIDI Clock is sent, but not received

•

In: MIDI Clock is received, but not sent

•

Slave Thru (i-0): MIDI Clock is received and passed to MIDI Out

•

In, No Start/Stop (n55): Receives MIDI Clock but does not respond to
MIDI Start or Stop commands.

When set to in or slave thru, if no MIDI clock is present at the selected input,
the arpeggiator and sequencer will not function.

OB-6 Operation Manual

Global Settings

4. Clock Port: MID, USB—Sets the ports, MIDI or USB, by which MIDI

clock signals are received.

5. Param Xmit: Off, CC, NR—Changes to the values of front panel

controls are transmitted via MIDI as Continuous Controllers (CC) or Nonregistered Parameter Number (NR). Transmission of parameters can also be
turned off. You could, for example, turn the filter frequency knob on the
OB-6 and have it affect the cutoff frequency of another synthesizer. For a list
of OB-6 CCs and NRPNs, see Appendix D.

NRPNs are the preferred method of parameter transmission, since they cover
the complete range of all parameters, while CCs are limited to a range of 128.

6. Param Rcv: Off, CC, NR—Sets the method by which parameter changes are
received via MIDI. As with transmission, NRPNs are the preferred method.
7. MIDI Control: Off, On—When On, the synth will respond to MIDI
controllers, including Pitch Wheel, Mod Wheel, Pedal, Volume.
8. MIDI Sysex: MID, USB— When set to MIDI (MID) it will receive

and transmit them using the MIDI ports/cables When set to USB it
will receive and transmit them using the USB port/cable. MIDI SysEx
messages are used when sending and receiving a variety of data including, programs, alternative tunings, system updates, and more.

9. MIDI Out: MID, USB—Sets the port by which MIDI data will be trans-

mitted (MIDI or USB).

Globals - Bottom Row
0. Local Control: Off, On—When on (the default), the keyboard and

front panel controls directly affect the OB-6. When off, the controls are
transmitted via MIDI but do not directly affect the “local” synth (that is,
the OB-6). This is primarily useful for avoiding MIDI data loops that can
occur with some external sequencers.

Global Settings

Dave Smith Instruments

1. Seq Jack: NOR, Tri, Gat, T-g (Normal, Trigger, Gate, T-G)—Selects

the mode for signals received on the rear-panel Sequencer jack.
•

With normal selected, a footswitch will start sequencer playback.

•

With trig selected, an audio signal connected to the sequencer jack will
step the sequencer when the sequencer’s play button is on.

•

With gate selected, an audio signal connected to the sequencer
jack will trigger and gate the envelopes while you hold a note or
chord. Additionally, turning on the sequencer or arpeggiator will add
sequencer or arpeggiator playback—but controlled by the OB-6’s clock
bpm and value settings and not the audio trigger.

•

With t-g (trigger+gate) selected, an audio signal connected to the
sequencer jack will trigger and gate the envelopes while you hold a
note or chord. Additionally, pressing the sequencer’s play button will
also add synchronized sequencer playback.

For best results when triggering the sequencer with an audio signal, use a loud
signal with a sharp attack/decay and little or no sustain.

2. Pot Mode: Rel, Pas, Jup (Relative, Passthru, Jump)—The rotary controls

on the front panel are a mixture of “endless” rotary encoders and potentiometers or “pots.” The pots are identifiable by their lined knobs and the
fact that they have about 300° of travel. There are three pot modes to determine how the synth reacts when the programmable parameters are edited.
(Master volume is not programmable, so these modes don’t apply.)

In Relative mode, changes are relative to the stored setting. In Relative mode, the
full value range is not available until either the minimum or maximum value and
the respective lower or upper limit of the pot’s travel is reached. For example,
the resonance parameter has an internal value range of 0 to 127. Let’s
say the physical position of the resonance pot is the equivalent to a
value of 100. If you switch to a program that has a stored Resonance
setting of 63 and turn the pot all the way up, it will only go to 90. To get
to the maximum value of 127, you first have to turn down until the value is
at the other extreme and the pot is at the limit of its travel (in this case, 0
and fully counter-clockwise, respectively).
In Passthru mode, turning the pot has no effect until after the edited
value equals the preset value (that is, until the edited value “passes
through” the stored value).
OB-6 Operation Manual

Global Settings

Jump mode uses an absolute value based upon the position of the pot
when edited: turn a pot and the value jumps immediately from the stored
value to the edited value.
3. Sustain +/- : Nor, Rev, n-r, r-n (Normally Open, Normally Closed,
Sustain Normally Open/Sequencer Normally Closed, Sustain Normally
Closed/Sequencer Normally Open)—The Sustain pedal polarity param-

eter affects both the sustain pedal and sequencer jack input ports. There
are two types of momentary footswitches, normally open and normally
closed. Either type can be used with the OB-6. Not sure which type
you have? If the behavior of the footswitch is the opposite of what is
expected — that is, down is off and up is on — changing this setting will
correct that.
4. Alt Tuning: Nor, 1…16 (Normal, 1…16)—Selects one of the OB-6’s built-

in tunings. Set to normal, the tuning is standard, chromatic tuning. Choosing
1 through 16 selects an alternative, non-chromatic, non-Western scale that can
be used to emulate ethnic instruments or in other creative ways.
See “Appendix A: Alternative Tunings” on page 63 for a description of
each tuning. Additional tunings can be imported into the OB-6 as a SysEx
message. For more information, see Appendix A.
5. Vel Response: 0-3 (Curve 0, Curve 1, Curve 2, Curve 3)—Sets one of four

velocity curves to adjust the keyboard’s velocity response to your playing style.

6. AT Response: 0-3 (Curve 0, Curve 1, Curve 2, Curve 3)—Sets one of

four pressure curves to adjust the keyboard’s aftertouch response to your
playing style.

7. Stereo/Mono: Ste, Mon (Stereo, Mono)—The OB-6 defaults to stereo

operation. When set to Mono, this parameter defeats all pan settings and
modulation, effectively making each of the outputs a mono output.
8. Pgm Dump: Prg, Ten, Ban, usr, All (Program, Tens, Bank, User
Banks, All)—Transmits the current program, ten programs from the

currently selected bank and tens location, the current bank, all user
banks (0-4), or all banks (both user and factory) in SysEx format via the
selected MIDI port. (See: “MIDI Sysex.”) Dumped programs will load
back into the same bank and program location in memory when received by
the OB-6 via MIDI.
14

Global Settings

Dave Smith Instruments

Oscillators
Oscillators provide the raw building blocks of the OB-6’s sound by
producing waveforms, each of which has its own inherent sound character based on its harmonic content. The OB-6 has two oscillators, plus a
sub oscillator and a noise generator per voice. Level controls for each of
these are located in the Mixer section.
Oscillator 1 is capable of generating sawtooth, and variable-width pulse
waves. Oscillator 2 generates triangle, sawtooth, and variable-width
pulse waves. These waveshapes are continuously variable and smoothly
transition from one shape to the next as you turn the shape knob. This
provides a variety of “in-between” waveshapes.

The oscillators on the OB-6 are extremely stable. To emulate the random pitch
drift and oscillator instability of vintage instruments, use the detune parameter (next to
the unison button) to dial in as little or as much drift as you like.

OSCILLATORS
VCO 1
FREQUENCY

VCO 2
SYNC

PULSE WIDTH

FREQUENCY

DETUNE

LOW FREQ

PULSE WIDTH

KEYBOARD

Oscillators 1 and 2

Oscillator 1 can be hard-synced to Oscillator 2 for complex, harmonically-rich sounds when modulated.
Oscillator 2 features a detune knob for detuning and thickening sounds,
a low freq switch that allows it to function as an LFO for modulation
purposes, and a keyboard switch that disables keyboard control over its
pitch (useful when used as an LFO, or for drones and other effects).

OB-6 Operation Manual

Oscillators

Oscillator Parameters
Frequency: Sets the base oscillator frequency over a 9-octave range from
16 Hz to 8KHz (when used with the Transpose buttons). Adjustment is in
semitones.

The global Master Tune settings affect the pitch of all oscillators. See “Globals Top Row” on page 11 for more information.

Detune: Fine tune control with a range of a quartertone up or down. The

12 o’clock position is centered. Steps are in cents (50 cents = 1/2 semitone).

Shape: Sawtooth, Pulse (and Triangle on Osc 2) —Used to select the

waveshape generated by the oscillator. Waveshapes are continuously
variable and smoothly transition from one shape to the next as you turn
the shape knob. This provides a variety of “in-between” waveshapes.

Pulse Width: Changes the width of the pulse wave from a square wave

when the pulse width knob is at center position, to a very narrow pulse
wave when the pulse width knob is full left or right.

Applying pulse width modulation using X-Mod or the low frequency oscillator
is a great way to add movement and thickness to a sound, especially when creating
pad or string-like sounds.

Sync: Off, On—Turns Oscillator 1 hard sync on. Sync forces Oscillator
1 (the slave) to restart its cycle every time Oscillator 2 (the master) starts
a cycle. This provides a way to create more complex, harmonically rich
shapes from simple waveforms—especially when the frequency of Oscillator 1 is set to a different interval than Oscillator 2.

Oscillators

Dave Smith Instruments

Oscillator 1
Oscillator 2
Oscillator 1
synced to
Oscillator 2
Oscillator hard sync

Use X-Mod to sweep the pitch of Oscillator 1 when it is synced to generate the
classic, hard-edged sync sound.

Low Frequency: Off, On—Turns Oscillator 2 into a low-frequency
oscillator, essentially providing another LFO source for modulation
using X-Mod. The frequency, detune, shape, and pulse width controls
still apply and will affect the character of any low-frequency modulation
applied using Oscillator 2.
Keyboard: Off, On—When off, the Oscillator 2 ignores the keyboard

and note data received via MIDI and plays at its base frequency setting.
Oscillator 2 pitch can still be affected by modulation from other sources
when in this mode.

OB-6 Operation Manual

Oscillators

Detune
Detune (next to the unison button) adds randomized detuning to the
oscillators to emulate the tuning instability of vintage analog oscillators.
This tuning instability is a big part of what made vintage instruments sound
characteristically warm and fat.
Because the OB-6 oscillators are extremely stable, small amounts of
can help impart a very vintage tone to what is otherwise a very
stable, modern instrument. detune amount is adjustable from subtle to
wildly out of tune.
detune

When unison is enabled, detune detunes the unison voices by a fixed
amount. Using the pan spread feature, if an odd number of voices is
stacked, one of the voices is placed in the center of the stereo field with
the other voices spread right and left. The higher the pan spread setting,
the wider the stereo spread in unison.
DETUNE

UNISON

The detune knob

The global Master Tune settings affect the pitch of all oscillators. See “Globals Top Row” on page 11 for more information.

Detune

Dave Smith Instruments

Mixer
The Mixer section is where you set the levels of the various sound generators on the OB-6. These include VCO 1, VCO 2, Sub Octave (Oscillator
1 sub oscillator) and the white noise generator. You must turn up at least
one of these in order to make sound with the OB-6.

Rather than limit the OB-6’s outputs to keep the instrument from clipping, we
allow you to adjust levels at various points in its signal path. This gives you the option
to “overload” things in interesting ways, if you wish to do so. If not, try reducing the
levels of the oscillators in the mixer section, the env amount parameter in the Loudness
Envelope, or the resonance parameter in the filter.

MIXER
VCO 1

VCO 2

SUB OCTAVE

NOISE

The Mixer

VCO 1: Sets the output level of Oscillator 1.
VCO 2: Sets the output level of Oscillator 2.
Sub Octave: Controls the level of a square wave oscillator pitched one

octave below Oscillator 1. Adding a sub octave to sounds such as bass are
a great way to increase their low-register presence.

Noise: Sets the output level of the white noise generator.

OB-6 Operation Manual

Mixer

Filter
The Filter takes the basic, raw sound of the oscillators and noise generator and subtracts frequencies, changing the harmonic content and character of their sound. This change can be varied over time using the Filter
Envelope to produce more dynamic, animated timbres.
The OB-6’s filter is a 2-pole, 12 dB per octave, analog, state-variable filter
with low-pass, notch, high-pass, and band-pass modes.
The filter mode knob sets the filter’s mode of operation. It transitions
smoothly from low-pass to notch to high-pass operation, allowing a
blending of these modes. Band-pass operation is selected with the BP
switch. Each filter mode has its own characteristic sound and function:
•

Low-pass: passes frequencies below the cutoff frequency

•

Notch: removes frequencies in a notch centered around the cutoff frequency

•

High-pass: passes frequencies above the cutoff frequency

•

Bandpass: passes a band of frequencies centered around the cutoff frequency

Band-pass mode is selectable only through the bp on/off switch. However, you
can actually smoothly transition between normal and band-pass operation by choosing
norm-bp as a X-Mod destination in the mod matrix.

FILTER
FREQUENCY

NOTCH

RESONANCE

TRACK

HALF FULL

The OB-6 Filter

Filter

Dave Smith Instruments

Frequency: Sets the filter’s cutoff frequency. In Low-Pass mode,
frequencies are reduced from the top down — cutting the high frequencies and passing the low, hence the name “low-pass.” In High-Pass mode,
frequencies are reduced from the bottom up — cutting the low frequencies and passing the high, hence the name “high-pass.” In Notch mode,
frequencies are removed in a notch centered around the cutoff frequency.
In Bandpass mode, a band of frequencies are passed through the filter
centered around the cutoff frequency — while frequencies on either side
of that band are removed.
Resonance: Emphasizes a narrow band of frequencies around the cutoff

frequency. Unlike low-pass filters on some synthesizers, the OB-6 LowPass filter does not self oscillate. This is faithful to the original Oberheim
SEM design.

High levels of resonance can sometimes cause the OB-6 outputs to clip if
its sound generators are also set to high output in the Mixer. Monitor your outputs
carefully to ensure optimal, clean signal levels. If you experience signal clipping, try
reducing the levels of the oscillators in the mixer section, the amount parameter in the
Loudness Envelope, or the resonance parameter in the filter.

Track: off, half, full—Sets the amount of modulation from the keyboard

to the filter’s cutoff frequency. Selecting half or full means that the
higher the note played on the keyboard, the more the filter opens. This
is useful for adding brightness to a sound as higher notes are played, which
is typically how acoustic instruments behave. If both half and full are off,
keyboard filter tracking is off, meaning that filter frequency is unaffected by
playing higher or lower notes on the keyboard.

OB-6 Operation Manual

Filter

Filter Envelope
The OB-6 filter has a dedicated, four-stage envelope generator. The Filter
Envelope is used to shape the harmonic characteristics of a synthesized
sound by giving you filtering control over its attack, decay, sustain, and
release stages.
This is one of the most important factors in designing a sound. Without
an envelope, the filters would be completely static. They would stay
open or closed by a fixed amount that wouldn’t change over the duration
of a sound. That’s not very interesting to listen to and it’s not how instruments behave in the real world.
In general, sounds produced by an instrument are brighter at their beginning (the attack stage) and grow mellower as they die out (the decay
and release stages). In other words, their harmonic content changes over
time. This is exactly what the filter envelope is designed to emulate.

ENVELOPES
FILTER ENVELOPE
ATTACK

DECAY

SUSTAIN

RELEASE

AMOUNT
VELOCITY

Amplitude

Release

Sustain

Decay

Attack

Filter Envelope

Time

A typical 4-stage envelope

Filter Envelope

Dave Smith Instruments

Attack: Sets the attack time of the envelope. The higher the setting, the

slower the attack time and the longer it takes for the filter to open from
the level set with the filter frequency knob to the level set by the filter
envelope amount. Percussive sounds typically have sharp (short) attacks.

Decay: Sets the decay time of the envelope. After a sound reaches the

filter frequency set at its attack stage, decay controls how quickly the
filter then transitions to the cutoff frequency set with the sustain knob.
The higher the setting, the longer the decay. Percussive sounds, such as
synth bass, typically have shorter decays (and a generous amount of lowpass filter resonance).
Sustain: Sets the filter cutoff frequency for the sustained portion of the
sound. The sound will stay at this filter frequency for as long as a note is
held on the keyboard.
Release: Sets the release time of the envelope. This controls how

quickly the filter closes after a note is released.

Velocity: on, off—When enabled, allows key velocity to influence filter

frequency. If the amount is set to a positive value in low-pass filter
mode, the harder you play, the more the filter will open and the brighter
the sound will be. Conversely, if the amount is set to a negative value,
the harder you play, the more the filter will close and the less bright the
sound will be. This control makes for more touch-sensitive sounds
Amount: Sets the amount of modulation from the filter envelope to the

filter. Higher amounts more dramatically affect the cutoff frequency. This
control is bipolar. Positive settings produce standard behavior. Negative
settings invert the envelope.

The description of envelope behavior above is true when the amount parameter
is set to a positive value. But since this control is actually bi-polar, it is possible to set
a negative amount of modulation. In this case, the envelopes are inverted and their
behavior changes. The best way to get a feel for the difference is to experiment with
both positive and negative settings of the envelope amount parameter.

The cutoff frequency setting may limit the effect of the envelope on the filter. For
example, in low-pass filter mode , if frequency is at its highest setting, a positive envelope amount will have no effect on the filter since the filter is already completely open.

OB-6 Operation Manual

Filter Envelope

Changing the Filter Envelope’s Response Curve
By default, the envelopes of all synthesizers are designed to have certain
type of response curve that is largely dependent on the preference of the
designer. In most cases, this can’t be changed. The current preference is
that the faster or snappier the envelopes, the better.
However, in the case of the OB-6, there is a hidden feature in the X-Mod
section that allows you to modify the responsiveness of the Filter Envelope’s ADSR controls. This opens up a new level of fine adjustment of
these controls that is subtle but powerful. Try it and see.
To adjust the responsiveness of the filter envelope:

1. Select a program — such as a synth brass sound — that has a slightly
soft but bright attack.
2. Repeatedly play a series of notes or chords on the keyboard, so you can
hear the effect of the adjustments as you follow the steps below.
3. In the X-Mod section, enable the filtr freq as the only destination
(disable all other X-Mod destinations such as vco 1, shape 1, etc.).
4. In the X-Mod section, turn the filter env control slightly counterclockwise. Try a setting of about 11 o’clock.
5. Continue to play a series of chords and turn the amount knob in the
filter envelope section. Try moving it back and forth between 1
o’clock and 3 o’clock.
6. As you do this, compare different settings of the X-Mod filter env
control, the Filter Envelope amount, and different Attack, Decay,
Sustain, and Release settings on the Filter Envelope.

The interaction of these controls is worth exploring for greater flexibility
and control of the Filter Envelope.

Filter Envelope

Dave Smith Instruments

Loudness Envelope
After passing through the filters, a synthesized sound goes into an analog
voltage controlled amplifier or VCA, which controls its overall loudness.
The VCA has a dedicated, four-stage envelope generator.
The Loudness Envelope is used to shape the volume characteristics of
a sound over time by giving you control over its attack, decay, sustain,
and release stages. Along with the filter envelope, this is one of the most
important factors in designing a sound.
Without a loudness envelope, the volume of a sound wouldn’t change
over the duration of a note. It would begin immediately, remain at its full
volume for the duration of the note, then end immediately when the note
was released. Again, that’s not very interesting sonically and it’s not typically how instruments behave in the real world.
To give you a real-world example, the main difference between the
sound of the wind and the sound of a snare drum is that they have very
different loudness envelopes. Otherwise, they are essentially both white
noise. Wind has a relatively slow attack, a long sustain, and a long decay
and release. A snare drum has a sharp attack, no sustain, and virtually no
decay or release. But again, they are both fundamentally white noise.
ATTACK

DECAY

SUSTAIN

RELEASE

AMOUNT

VELOCITY

LOUDNESS ENVELOPE

Amplitude

Release

Sustain

Decay

Attack

Loudness Envelope

Time

A typical four-stage, ADSR envelope shape

OB-6 Operation Manual

Loudness Envelope

Attack: Sets the attack time of the envelope. The higher the setting, the

slower the attack time and the longer it takes for a sound to reach its full
volume. Pads typically have softer (longer) attacks. Percussive sounds
have sharper (shorter) attacks.

Decay: Sets the decay time of the envelope. After a sound reaches its full

volume at its attack stage, decay controls how quickly the sound transitions to the level set with the sustain control. The higher the setting, the
longer the decay. Percussive sounds, such as synth bass, typically have
shorter decays.

Sustain: Sets the sustain level of the envelope. The higher the setting,
the louder the sustained portion of the sound will be. The sound will stay
at this level for as long as a note is held on the keyboard.
Release: Sets the release time of the envelope. This controls how

quickly a sound dies out after a note is released.

Amount: Sets the amount of modulation from the Loudness Envelope to

the VCA. In most cases you will probably want to set this fully clockwise
for maximum VCA volume. If you experience signal clipping, try reducing the env amount or the levels of the oscillators in the mixer section.

To recreate the “gated VCA” effect used on certain classic rock anthems,
choose an organ sound, then set the loudness envelope amount to zero, route the LFO
square wave to amp with an initial amt setting of 100% and hold a few chords.

Velocity: This button enables keyboard velocity to modulate the Loudness Envelope amount. The harder you play, the more the Loudness
Envelope is affected. This makes for more touch-sensitive sounds.

Loudness Envelope

Dave Smith Instruments

Effects
The OB-6 effects section allows you to add up to two, 24-bit, 48 kHz digital
effects to any sound. Though the OB-6 sounds great on its own, adding a
touch of reverb or delay can enhance many sounds with a subtle (or not
so subtle) sense of ambience and depth. Other effects such as the chorus
and phaser are useful for adding more conspicuous tonal enhancement as
well as emulating classic instruments such as string ensembles and so on.
While the effects themselves are digital, the main signal path of the OB-6
is analog. The on/ off switch enables and disables both Effect A and
Effect B, using a true bypass, ensuring a pure analog signal path.
Effects settings are saved individually with each program. Time-based
effects such as the Delays can be synchronized to the arpeggiator, sequencer,
or MIDI clock to produce repeats that occur on the beat.
EFFECTS
ON/OFF

EFFECT

TYPE

MIX

CLK SYNC

The Effects section

Effects are divided into sets A and B. You can choose a single effect from
each set. Effect A and B are applied one after another, in series. For this
reason, reverb effects are only available as Effect B, since it’s the last
stage in the serial effects chain — where reverb is traditionally applied.
Either effect can also be set to “off.”

OB-6 Operation Manual

Effects

Effect A:
• Delay 1 (“bbd”) - vintage bucket-brigade emulation
• Delay 2 (“ddl”) - classic digital delay
• Chorus (“CHO”) - vintage chorus
• Flanger 1 (“FL1”) vintage flanger, high resonance
• Flanger 2 (“FL2”) vintage flanger, no feedback
• Phase Shifter 1 (“PH1”) vintage 6-stage phaser, high resonance
• Phase Shifter 2 (“PH2”) vintage 6-stage phaser, lower resonance
• Phase Shifter 3 (“PH3”) faithful emulation of Tom Oberheim’s
original 6-stage phaser
• Ring Modulator (“Ri n ”) faithful emulation of Tom Oberheim’s
original ring modulator design

Effect B:
• Delay 1 (“bbd”) - vintage bucket-brigade emulation
• Delay 2 (“ddl”) - classic standard digital delay
• Chorus (“CHO”) - vintage chorus
• Flanger 1 (“FL1”) vintage “through-zero” flanger, high resonance
• Flanger 2 (“FL2”) vintage “through-zero” flanger, no feedback
• Phase Shifter 1 (“PH1”) vintage 6-stage phaser, high resonance
• Phase Shifter 2 (“PH2”) vintage 6-stage phaser, lower resonance
• Phase Shifter 3 (“PH3”) faithful emulation of Tom Oberheim’s
original 6-stage phaser
• Ring Modulator (“Ri n ”) faithful emulation of Tom Oberheim’s
original ring modulator design
• Reverb 1 (“HAL”) - classic hall emulation
• Reverb 2 (“rOO”) - classic room emulation
• Reverb 3 (“PLA”) - classic plate emulation
• Reverb 4 (“SPr”) - vintage guitar-amp-style spring emulation
28

Effects

Dave Smith Instruments

To use Effects:

1. Press the on/off switch to turn on Effects.
2. Press effect and choose A or B, depending on which you want to apply
and configure.
3. Turn the type knob to select an effect. Names are abbreviated. For
instance “bbd” is the bucket-brigade delay. Refer to the list above.
4. Turn the mix knob to the right to blend in a good amount of the processed
signal. You’ll want to be able to clearly hear the effect when you tweak its
settings. You can dial it down afterward.
5. Use the parameter 1 and parameter 2 knobs to adjust the effect’s parameters to your taste. See “Effects Parameters” on page 29 for details
on the adjustable parameters on each effect type.
6. Finally, adjust the mix knob to optimize the amount of the effect. Full
left is completely dry. Full right is completely wet (a 100% processed
signal).
7. Repeat as needed to add a second effect.

Effects Parameters
On/Off: Turns both effects, A and B, on and off. The on/off switch uses a

true bypass, ensuring a pure analog signal path.

Effect: A, B—Selects either effect A or B for editing. Once selected, all

adjustments apply to that effect.

Type: Off, bbd, ddl, CHO, FL1, PH1, PH2, PH3, RNG, HAL, rOO, PLA, SPr—Selects

the effect type.

Mix: 0...127—Sets the balance between the processed (wet) signal
and unprocessed (dry) signal. Full left is completely dry. Full right is
completely wet.

OB-6 Operation Manual

Effects

Clock Sync: On, Off—When a delay effect is chosen, this enables syncing

of the timed delay repeats (feedback) to the Arpeggiator, Sequencer, or MIDI
clock. When Sync is on, delay time provides the following values:
Value

Delay Time

1
2d
2
4t
4d
4
8d
8
8t
16d
16

4 beats
3 beats
2 beats
1 beat
1 1/2 beat
1 beat
3/4 of 1 beat
1/2 of 1 beat
1/2 of 1 beat
3/8 of 1 beat
1/4 of 1 beat

Maximum delay time is 1 second. The combination of longer synced delay
times with slower tempos can result in delay times that would be greater than 1
second. When that happens, the delay time is divided by 2 until it no longer exceeds
the 1 second limit. For example, if the BPM is set to 60 and Delay Time is set to Half,
the expected delay time would be 2 seconds. The actual delay time will be 1 second
(i.e. 2 seconds divided by 2).

Parameter 1: Variable, depending on the effect—This knob adjusts
parameter 1 for the chosen effect. Each effect has two adjustable parameters, which differ depending on the effect.
Parameter 2: Variable, depending on the effect—This knob adjusts
parameter 2 for the chosen effect. Each effect has two adjustable parameters, which differ depending on the effect.

Effects

Dave Smith Instruments

Display
bbd

Effect Type
bucket-brigade delay

Parameter 1
delay time

Parameter 2
feedback amount

ddl

digital delay

delay time

feedback amount

cho

chorus

rate

depth

fl1

flanger

rate

depth

fl2

flanger

rate

depth

PH1

phaser 1

rate

depth

PH2

phaser 2

rate

depth

PH3

phaser 3

rate

depth

Rin

ring modulator

HAL

hall reverb

modulator
frequency
time

low-note pitch
tracking on/off
early reflections

rOO

room reverb

time

early reflections

PLA

plate reverb

time

early reflections

SPr

spring reverb

decay

tone

bbd: This is a vintage bucket-brigade delay emulation. Bucket-brigade

delays were originally a type of analog delay characterized by relatively
short delay times and a warmer character than digital delays due to their
loss of treble and clarity in the delayed analog signal. Adjustable parameters are delay time and feedback amount.

To recreate a classic bucket-brigade time-shifting effect, try adjusting the time
parameter in real time.

ddl: This is a classic digital delay. Adjustable parameters are delay time

and feedback amount.

CHO: This is a vintage chorus emulation. Use it to thicken and add

animation to any sound. Adjustable parameters are rate and depth.

FL1: This is a vintage flanger emulation. Use it to add a sweeping resonant effect to a sound. This effect has true through zero flanging capability. Adjustable parameters are rate and depth.

OB-6 Operation Manual

Effects

FL2: This is a vintage flanger without a feedback path and is designed to
emulate the through zero capability of tape deck flanging. Use it to add
a sweeping flanged effect to a sound. Adjustable parameters are rate and
depth.
PH1: This is a vintage phaser emulation with high resonance. Use it to

add a deep, sweeping, swirling resonant effect to a sound. Adjustable
parameters are rate and depth.

PH2: This is a vintage phaser emulation with lower resonance. Use it to

add a swirling resonant effect to a sound. Adjustable parameters are rate
and depth.
PH3: This is a faithful emulation of Tom Oberheim’s original phaser
design. Use it to add a swirling resonant effect to a sound. Adjustable
parameters are rate and depth.
rin: This is a faithful emulation of Tom Oberheim’s original ring modulator design. Use it to add a complex harmonic effect to a sound. Adjustable parameters are the modulation frequency and low note pitch tracking on/off.

The ring modulator’s mode of operation is determined by the setting of Parameter 2, (pitch tracking) which can be set to either on or off. With this parameter off, the
ring modulator functions like the original Oberheim unit. In this mode, pitch tracking is
off, and Parameter 1 sets the modulation frequency, which remains the same regardless of what note you play on the keyboard. With parameter 2 on, the ring modulator
tracks the pitch of the lowest note that you play on the keyboard. In this case the
Parameter 1 sets a ratio between the lowest note that you play and the modulator note
(instead of setting a fixed frequency). The modulation frequency will then change as
you change the lowest note that you’re playing, so that the ratio will remain constant
between the note that you play and note of the modulator. If you are only playing one
note at a time, then the ring modulator will modulate with the same ratio as you play
up and down the keyboard.

Set Parameter 2 to the “on” position to get more musical results from the ring
modulator.

Effects

Dave Smith Instruments

HAL: This is a Hall reverb. It’s the largest of the available reverbs. Adjust-

able parameters are reverb time and early reflection amount.

rOO: This is a Room reverb. It’s the second largest of the available reverbs.

Adjustable parameters are reverb time and early reflection amount.

PLA: This is a Plate reverb. It emulates a classic reverb plate. Adjustable

parameters are reverb time and early reflection amount.

SPr: This is a Spring reverb. It emulates a vintage, guitar-amp-style

reverb. Adjustable parameters are decay and tone.

Distortion
The OB-6 provides an analog distortion effect. This can be used to
add warmth, harmonic complexity, and an aggressive edge to sounds.
The character of the distortion is affected by the harmonic content of a
program. Sounds with more high-end will sound different than sounds
with fewer harmonics.
To add distortion:

1. Press and hold the effect button.
2. Turn the mix knob to set the distortion amount.
3. Release the effect button.
Press and hold
for 1 second

Display changes
to “Dist”

Turn Mix knob
to set amount

EFFECTS
ON/OFF

EFFECT

TYPE

MIX

Adding the Distortion effect

OB-6 Operation Manual

Distortion

Low Frequency Oscillator
The LFO is a special-purpose oscillator that produces a frequency below
the range of human hearing. The LFO is typically used for periodic
modulation such as vibrato (periodic pitch modulation) and tremolo
(periodic amplitude modulation).
The LFO on the OB-6 produces a variety of waveshapes, including sine,
sawtooth, reverse sawtooth, square, and random. Though most often used
for low-frequency modulation, the OB-6 LFO can actually function at speeds
that extend into the audible range for extreme effects.
LFO
FREQUENCY

SHAPE

SINE
SAWTOOTH
REV SAW
SQUARE
RANDOM

LFO SYNC

VCO 1

INITIAL AMT

VCO 2

PULSE WIDTH

AMP

FILTR FREQ FILTR MODE

The Low-Frequency Oscillator

Sine and Random waves are bipolar. That is, their waveshape is positive for
half of their cycle and negative for the other half. In the case of the sine
wave, this makes it possible to generate a natural-sounding vibrato that
goes alternately sharp and flat in equal amounts on either side of a center
frequency. Random, also known as “sample and hold,” generates a series
of random values, each held for the duration of one cycle
The square wave, sawtooth, and reverse sawtooth generate only positive
values. In the case of the square wave this makes it possible to generate naturalsounding trills.

Low Frequency Oscillator

Dave Smith Instruments

Triangle

Sawtooth

Reverse
Sawtooth

Square

Random

0
LFO waveshapes

The OB-6 has a sixth “hidden” LFO waveshape that you can use as a modulation source — noise. To access this, choose random then turn frequency all the way
clockwise. This generates a white noise waveform.

The LFO can be free-running or synced to the arpeggiator, sequencer, or
MIDI clock for tempo-synced effects such as filter sweeps, tremolo, and so on.
Frequency: Sets the frequency of the LFO waveshape routed to the
destination from a slow .022Hz to a fast 500Hz. See also “LFO Sync”
below.
LFO Sync: When on, the LFO synchronizes with the arpeggiator,

sequencer, or MIDI clock. By default, the LFO wave cycle is reset when
you press a key (but is not reset if you press a key while other notes are
held).

Shape: Sine, Sawtooth, Reverse Sawtooth, Square, Random—The

wave shape of the LFO. A sixth waveshape, noise, can be generated by
selecting random and turning the frequency knob all the way to the right.
Initial Amount: Sets the amount of LFO modulation routed to the
selected destinations. Setting an amount here applies the selected modulation continuously. If you set this parameter to zero but still select a
modulation destination, modulation is only applied when you use the
Mod Wheel.
VCO 1: Selects the frequency of Oscillator 1 as a modulation destina-

tion. Use a sine wave as a source to create vibrato. Use a square wave to
create trills.

VCO 2: Selects the frequency of Oscillator 2 as a modulation destina-

tion. Use a sine wave as a source to create vibrato. Use a square wave to
create trills.

OB-6 Operation Manual

Low Frequency Oscillator

Pulse Width: (Individually selectable for Oscillator 1 and Oscillator 2)

When Oscillator 1 or 2 are set to square wave, this modulates the pulse
width of the wave. Use a sine wave LFO to create a chorus-like effect
often used to emulate strings.

Amp: Selects the amplitude level as a modulation destination. Use a sine

wave LFO to create a tremolo effect.

Filtr Freq: Selects the filter cutoff frequency as a modulation destination.

Use a sine wave LFO to create an auto-wah effect when in low-pass filter
mode. Modulating the filter at high frequencies can create interesting
timbres.
Filtr Mode: Selects the filter mode as a modulation destination, changing

smoothly between low-pass, notch, and high-pass modes. Modulating the
filter at high frequencies can create interesting timbres.

X-Mod
Although the overall sonic character of the OB-6 is determined by its
analog oscillators and filters, much of its power to make truly unique and
unusual sounds comes from the X-Mod section.
X-MOD
FILTER ENV

VCO 1

VCO 2

SHAPE 1

PW 1

FILTR FREQ

FILTR MODE

The X-Mod section

X-Mod

Dave Smith Instruments

X-Mod modulation sources:

•

Filter envelope

•

VCO 2 frequency

X-Mod modulation destinations:

•

VCO 1 frequency

•

VCO 1 waveshape

•

VCO 1 pulse width

•

Filter cutoff frequency

•

Normal to Bandpass filter mode

•

Filter mode (Low-Pass, Notch, High-Pass)

You can control how much the source affects the destination by dialing
in a specific modulation amount with the filter env or VCO 2 knobs.
Modulation amount can either be positive or negative.
Use X-Mod to create complex harmonic effects ranging from FM
(frequency modulation) to audio-rate filter modulation and beyond. Many
classic sounds on the original Oberheim OB-series of synthesizers were
created through clever use of X-Mod.

X-Mod Parameters
Filter Env: Selects the amount of modulation from the Filter Envelope
that is applied to a selected destination. Modulation amount can be either
positive or negative.
VCO 2: Selects the amount of modulation from Oscillator 2 that is

applied to a selected destination. Modulation amount can be either positive or negative.

When using VCO 2 as a modulation source, the modulation character is
affected by the waveshape currently chosen for Oscillator 2 (triangle, sawtooth, or
square/pulse). Try setting Oscillator 2 to low frequency (using the low freq switch) to
further increase modulation possibilities.

OB-6 Operation Manual

X-Mod

VCO 1: Selects Oscillator 1 frequency as a modulation destination.
Choose VCO 2 as a modulation source to produce FM effects with their

characteristic complex harmonics and metallic timbre.

Shape 1: Selects the Oscillator 1 waveshape as a modulation destination.

This can animate the timbre of Oscillator 1 in interesting ways.

PW 1: When Oscillator 1 is set to pulse wave, choosing this as a destination modulates its pulse width. This will animate the timbre of Oscillator 1
in interesting ways.
Norm - BP: Selects the filter mode as a modulation destination, changing

smoothly between normal filter behavior (low-pass, notch, and high-pass
modes) and bandpass mode.

Filtr Freq: Selects the filter cutoff frequency as a modulation destination.
Use a sine wave LFO to create an auto-wah effect when in low-pass filter
mode. Modulating the filter at high frequencies can create interesting
timbres.
Filtr Mode: Selects the filter mode as a modulation destination, changing

smoothly between low-pass, notch, and high-pass modes. Modulating the
filter at high frequencies can create interesting timbres.

Arpeggiator
The OB-6 has a full-featured Arpeggiator. Turn it on, hold a chord and
the OB-6 will play a pattern based on the individual notes held. Choose
a mode (up, down, random, etc.), an octave range (1, 2, or 3), and a
tempo, then pair it with an appropriately percussive sound, and you’ll be
surprised at the number of creative things you can do.
When hold is active, the Arpeggiator is in “relatch” mode, where playing a new chord latches to the new chord rather than adding notes to the
existing chord.

X-Mod

Dave Smith Instruments

If you enable hold, you can release the notes on the keyboard and the
Arpeggiator will continue to play. In addition, the Arpeggiator features
auto-latching: With hold on, played notes are held on and arpeggiated,
and any additional notes you play are added to the arpeggio—as long as
at least one key is continuously held.
You can sync the Arpeggiator to external MIDI clock, or even an external
audio signal. When the Arpeggiator is playing, the Sequencer is disabled.
CLOCK
TAP TEMPO

BPM

ARPEGGIATOR
VALUE

ON/OFF

OCTAVES

MODE

SEQUENCER
RECORD

PLAY

1
2
3

The Arpeggiator section

To use the Arpeggiator:

1. Press the Arpeggiator on/off switch to turn it on.
2. Hold down one or more notes on the keyboard. The Arpeggiator plays
them according to the settings you’ve chosen.
3. To latch arpeggiation on (so that you don’t have to continuously hold
down notes) press the hold button.
4. Adjust settings such as mode, octave, repeats, bpm and value.
5. To synchronize a delay effect to the Arpeggiator, turn on clock sync in
the Effects section, choose a delay, and adjust its delay time setting as
desired.

An audio signal connected to the rear-panel footswitch - sequence jack can be
used to control arpeggiator (and sequencer) playback. This makes it possible to tempo
sync the arpeggiator to a recorded drum track or other audio source. Audio signals used
to drive the arpeggiator/sequencer should not exceed 5 volts peak-to-peak. See “Seq
Jack” on page 13 for more information about choosing the appropriate mode for these
behaviors.

OB-6 Operation Manual

X-Mod

Arpeggiator Parameters
Tap Tempo—Tapping the tap tempo button sets the tempo from 30 to

250 BPM. The LED flashes at the BPM rate you set. Tap the button at
least 4 times to set the tempo.
BPM: 30…250—Sets the tempo for the arpeggiator in BPM (beats per

minute). The tap tempo LED flashes at the BPM rate. When lfo sync is
enabled on the low-frequency oscillator, or clock sync is enabled in the
Effects section, the BPM rate affects the LFO frequency and/or delay effect.
When syncing to an external MIDI clock source, the BPM setting has no effect.

Value—Selects a basic note value relative to the BPM. See the table below:
Name
Half
Qtr

Tempo
BPM/2
BPM

Timing Division
Half note
Quarter note

8th
8th D
8th S
8th T

BPM x 2
BPM x 2
BPM x 2
BPM x 3

Eighth note
Eighth note, dot
Eighth note, swing timing
Eighth note triplets

16th
16th S
16th T
32nd

BPM x 4
BPM x 4
BPM x 6
BPM x 8

Sixteenth note
Sixteenth note, full swing timing
Sixteenth note triplets
Thirty-second note

On/Off—Turns the Arpeggiator on and off.
Octave: 1 Octave, 2 Octaves, 3 Octaves—Set to 1 Octave, only the

keyed notes are arpeggiated. Set to 2 Octaves, the keyed notes and the
notes one octave above them arpeggiate. Set to 3 Octaves, the keyed
notes and the notes one and two octaves above them arpeggiate.

X-Mod

Dave Smith Instruments

Mode: Sets the order in which notes play when Arpeggiator is on. See the table.
Arp Mode

Behavior

Plays from lowest to highest note

Down

Plays from highest to lowest note

Up + Down

Plays from lowest to highest and back to lowest

Random

Plays notes in random order

Assign

Plays notes in the order the keys were pressed

Sequencer
The OB-6’s sequencer is similar to a classic step sequencer. It allows you
to create a single sequence of up to 64 steps, including rests and ties, with
up to 6 notes per step. In addition, you can play along with a sequence
(provided there is available polyphony), making it a powerful live performance tool. When the Sequencer is playing, the Arpeggiator is disabled.
CLOCK

TAP TEMPO

BPM

ARPEGGIATOR

VALUE

ON/OFF

OCTAVES

MODE

SEQUENCER

RECORD

PLAY

The Sequencer/Arpeggiator

An audio signal connected to the rear-panel footswitch - sequence jack can
be used to control sequencer playback. This makes it possible to tempo sync the
sequencer (or arpeggiator) to a recorded drum track or other audio source. Audio
signals used to drive the arpeggiator/sequencer should not exceed 5 volts peak-topeak. See “Seq Jack” on page 13 for more information about choosing the appropriate mode for these behaviors.

Programming the Sequencer
Though programming the sequencer is simple, you can create sequences that
are rhythmically and melodically complex by combining a repeating phrase
or bass line with chords, ties, and rests. You can play up to 64 steps with up
to 6 notes held simultaneously per step. For most sequences you’ll probably
want to use sounds with a relatively sharp attack and short release.
OB-6 Operation Manual

Sequencer

Most factory programs have a sequence associated with them. Recall a
program and press the Sequencer’s play button to hear its associated sequence.

To program a note sequence:

1. Press the record button.
2. Perform the sequence on the keyboard. The display indicates the
current step as you play.

When recording a chord as a step, as long as you continue to hold at least one
note down, you can keep adding notes to the chord/step, and even use the transpose
buttons to extend the keyboard range while doing it.

3. To add a rest as you play, press the tens/increment button for that step,
then continue playing.
4. To add a “tie” that extends the length of a note, continue to hold down
the note(s) and press the tens/increment button repeatedly to extend the
note the number of steps you want.
5. To step back a step in the sequence, press the bank select/decrement
button. This will step back to the previous step so that you can rerecord
it. (Stepping back erases the step.)
6. When you’re done, press play to listen to your sequence.
7. To save the sequence, save the program and they are saved together.
(See “Saving a Program” on page 5.)

If you want to play live along with the sequencer, be sure to leave voices available. In other words, don’t play 6-note chords for every step in the sequence!

To play a sequence:

1. Press play. The sequence plays back at the current BPM setting.
2. To stop playback, press play again.

Alternatively, you can start and stop sequencer playback using a footswitch
connected to the rear-panel seq jack or using MIDI start/stop messages sent from a
DAW or other MIDI device. See “Seq Jack” on page 13 for more information.

Sequencer

Dave Smith Instruments

Use the bpm, value, or tap tempo controls to adjust sequencer playback speed.

To transpose a sequence:

1. Press play. The sequence begins playback.
2. Press and hold record and press a key on the keyboard. “Middle C”
is the reference point. Playing a note above middle C transposes the
sequence higher by that interval. Playing a note below middle C transposes the sequence lower by that interval.

Sequencer Parameters
Here are the controls and parameters used when interacting with the sequencer.
Record: On, Off—This switch turns sequencer recording on and off.
Play: On, Off—This switch turns sequencer playback on and off.
BPM: 30…250—Sets the tempo for the Sequencer and Arpeggiator in BPM
(beats per minute). The tap tempo LED flashes at the BPM rate. When lfo
sync is turned on, the BPM rate affects the LFO frequency. When syncing to
an external MIDI clock source, the BPM setting has no effect.
Tap Tempo: 30…250—Tap this button at least 4 times to quickly set the

tempo for the Sequencer and Arpeggiator. The LED flashes at the BPM
rate you set.

OB-6 Operation Manual

Sequencer

Value: Sets the note value for each sequencer/arpeggiator step relative
to the BPM. value works with both internal and external clock sources.
The following table lists the values:
Name
Half
Qtr

Tempo
BPM/2
BPM

Timing Division
Half note
Quarter note

8th
8th D

BPM x 2
BPM x 2

Eighth note
Eighth note, dot

8th S

BPM x 2

Eighth note, swing timing

8th T

BPM x 3

Eighth note triplets

16th
16th S
16th T
32nd

BPM x 4
BPM x 4
BPM x 6
BPM x 8

Sixteenth note
Sixteenth note, full swing timing
Sixteenth note triplets
Thirty-second note

Sequencer

Dave Smith Instruments

Master Volume/Program Volume
The master output level of the OB-6 is controlled by the front-panel
master volume knob in the output section. In addition, the volume of an
individual program can be set with the prgm vol knob in same section.
This is useful for ensuring that your sounds have roughly the same
volume from program to program. Unison sounds in particular can be
very loud compared to other programs.

OUTPUT
PAN SPREAD

PRGM VOL

MASTER VOLUME

The Output section

To set the volume of an individual program:

1. Choose a program.
2. In the output section, turn the prgm vol knob to set its volume.
3. Save the program. (See “Saving a Program” on page 4.)

MIDI volume can also influence the overall volume of the OB-6 if you are
controlling it from an external MIDI source.

OB-6 Operation Manual

Sequencer

Pan Spread
Pan Spread pans audio in the stereo field individually per voice. Set to
0, all voices are panned to the center. As you turn the pan spread knob
up, the audio in each voice is gradually moved away from the center by
greater amounts. Every other voice goes in a different direction, left or
right. This creates a broader stereo field while playing..

Transpose
The up and down buttons in the transpose section transpose the keyboard
up or down in octaves. The LED indicates the current keyboard transposition state. Transposing the keyboard also changes the MIDI note
numbers of the keys so that MIDI notes sent are also transposed. Transpose settings are global and are not saved with individual programs.
TRANSPOSE
0

The Transpose controls

Hold
When hold is on, any notes played will continue to play until hold is
turned off. When used in conjunction with the Arpeggiator, notes are
latched on and replaced by any new note(s) struck. If hold is on and at
least one key continuously held down, any new notes played are added to
the arpeggio.
HOLD

The Hold button

Sequencer

Dave Smith Instruments

Portamento
Portamento causes the pitch of a note to glide up or down from the pitch
of the previously played note. Portamento is turned on and off using
the portamento switch, but the rate must also be set. If the portamento
button is on, but rate amount is set to 0, portamento has no effect.
RATE

PORTAMENTO

The Portamento controls

There are four modes that determine how portamento behaves.
Fixed Rate (FR):The time to transition between notes varies with the

interval between the notes; the greater the interval, the longer the transition time. The portamento rate is fixed. This is the default portamento
mode.

Fixed Rate A (FRA): The same as Fixed Rate, but portamento is only
applied when playing legato. That is, portamento only occurs when a
note is held until the next note is played. This effectively allows portamento to be turned on and off from the keyboard.
Fixed Time (FT): Portamento is set to a fixed time, regardless of the
interval between notes.
Fixed Time A (FTA): The same as Fixed Time, but portamento only
occurs when playing legato.
To select a portamento mode:

1. Press and hold the portamento switch. The numeric display shows the
currently selected portamento mode.
2. To select a different mode, continue to hold down the portamento
switch then press the bank/decrement and tens/increment switches to
step through the other choices.
3. When finished, release the portamento switch.

OB-6 Operation Manual

Portamento

Unison
When unison is on, the OB-6 functions like a monophonic synthesizer in
that only 1 note can be played at a time. However, that one note can be
powered by as many as six voices, depending on how many you choose
to use. With up to 12 oscillators powering a single note (2 oscillators
per voice x 6 voices), you can create some very dense, speaker-rattling
sounds.

If you want to create an ultra heavy synth bass, try using Unison!

Unison gives you control over not only how many voices to stack,
but also the amount of detuning (with the detune knob) between the
oscillators, and what note gets priority if you happen to play more than
one note on the keyboard. (This is called the key assign mode or note
priority. See “Key Assign Modes” on page 50 for details.)
When Unison is enabled, the detune knob not only detunes the unison
voices but also spreads them out in the stereo field. If an odd number of
voices are stacked, one voice is placed in the center of the stereo field
with the other voices spread right and left. The higher the detune setting,
the wider the stereo spread.
DETUNE

UNISON

The Unison button

Unison

Dave Smith Instruments

To use Unison:

1. Press and hold the unison switch.
2. With the Unison switch held down, use the bank/decrement and tens/
increment switches to choose the number of voices to stack, then
release the Unison switch.
3. To detune the oscillators, use the detune knob.

Using Chord Memory
Unison has another useful feature: chord memory. Instead of assigning
voices to a single note, hold down a chord on the keyboard and press the
Unison switch. The OB-6 memorizes the notes of the chord. Single notes
played on the keyboard will then trigger all notes of the stored chord,
transposing them as you play up or down the keyboard. Try using this
feature to create powerful chord stabs and hits.
If you save a program that uses chord memory, the chord is saved with
the program. “CHD” will then appear as a choice if you step through
voice stacking options using the banks/decrement and tens/increment
buttons while holding down unison.

If low-note priority is chosen in Global settings, the note that you play corresponds to the lowest note of the chord voicing. Changing the Key Assign Mode to
high-note priority will make the note that you play correspond to the highest note in
the chord voicing.

To use chord memory:

1. Hold down a chord on the keyboard (6 notes maximum).
2. Press the unison switch. The chord voicing is memorized. Play a few
notes to listen to the result.
3. If you save the program, the unison chord memory is saved with it.
To clear chord memory:

1. Turn off Unison.
2. Hold down a single note.
3. Press the unison button.
4. Save the program again.
OB-6 Operation Manual

Unison

Key Assign Modes

Key Assign (sometimes called note priority) determines what note has
priority when more than one note is played on the keyboard or via MIDI:
•

Low-Note Priority (LO) is most common in vintage synths and is often
used for playing trills by holding a note and repeatedly tapping a lower
note.

•

Low Retrigger (LOr) causes the envelopes to be retriggered with each
keystroke.

•

High Note (Hi) and High Retrigger (Hir) are similar to the low note
settings, except that the highest note is given priority.

•

Last Note (LAS) and Last Retrigger (LAr) give priority to the last note
played.

To choose the Key Assign mode:

1. Press and hold key mode. The numeric display shows the currently
selected mode.
2. To select a different mode, continue to hold down the key mode switch
then press the bank/decrement and tens/increment switches to step
through the other choices.
3. Release the key mode switch when you’re finished.

Key Assign settings are only relevant to Unison mode. They do not affect polyphonic playback.

KEY MODE

DETUNE

UNISON

The key mode button

Unison

Dave Smith Instruments

Write
The write button saves the currently active program. Saving a program
overwrites a previously saved program.
The OB-6 contains a total of 1000 programs. 500 are permanent and
500 can be overwritten. Banks 0-4 are User Banks that can be overwritten. Banks 5-9 are Factory Banks that are permanent. You can edit the
programs of either bank, but you can only save them to Banks 0-4. As
shipped from the factory, presets 000-499 are identical to 500-999.
WRITE

The Write button
Decrement

BANK

BANK PROGRAM

SELECT

Increment

Transpose

MIDI Clock

Clock Port

TENS

Local Ctrl

Master Tune MIDI Channel
Seq Jack

Pot Mode

Sustain +/-

Alt Tuning

SELECT

MIDI Control

MIDI SysEx

Vel Response AT Response Stereo/Mono

Param Xmit

Pgm Dump

Param Rcv

MIDI Out

Program bank, tens, and number selectors

To save a program to the same preset location:

1. Press the write button. Its LED begins blinking.
2. Press a program selector button (0-9) to specify the “ones” digit of the program.
3. The write button LED stops blinking and the program is saved.
To save a program to a different bank location:

1. Press the write button. Its LED begins blinking.
2. Hold down the bank button then press a program selector button (0-9)
to specify the “hundreds” bank of the program. You can only save to
Banks 0-4.
3. Hold down the tens button then press a program selector button (0-9)
to specify the “tens” digit of the program.
4. Press a program selector button (0-9) to specify the “ones” digit of the
program.
5. The write button LED stops blinking and the program is saved.
OB-6 Operation Manual

Write

Canceling Save
Sometimes you may want to cancel saving a program before you commit.
To cancel the Save process before you commit:

•

If the write button LED is flashing, press it again. The LED stops flashing and saving is canceled. You can return to editing if you want.

Comparing Before You Save
Before writing a program to a new location, it’s a good idea to listen to the
program in the target location to make sure you really want to overwrite it.
To evaluate a program before you overwrite it:

1. Get ready to save by pressing the write button. It starts flashing.
2. Press the global button. Both LEDs on the button light up, indicating
compare mode.
3. Use the program buttons to navigate to the sound you want to compare
and play the keyboard to hear the sound.
4. To disable the compare function and go back to the edited sound, turn off
the global button. Programs can’t be written while in compare mode.
5. If you want to save the edited sound, the write button is still flashing
and ready to save, so enter a location with the program buttons. The
sound is saved.
6. Alternatively, if you want to cancel saving and continue editing, press
the write button. It stops flashing and saving is canceled.

Write

Dave Smith Instruments

Globals
Global settings are parameters that affect all programs. These include
settings such as Master Tune, MIDI Channel, MIDI Clock, and others.
Global parameters are printed in two rows the program number switches
(0 - 9). Press the globals button once to access the top row. Press it twice
to access the bottom row. For details on the various Global parameters,
see “Global Settings” on page 10.
GLOBALS

The Globals button

To change a Global setting:

1. Press the globals button. Pressing it once accesses the top row of
Global parameters. Pressing it twice accesses the top row of Global
parameters. The LED indicates which row is active.
2. Press the program selector button that corresponds to the Global
parameter you want to change.
3. Use the bank/decrement and tens/increment buttons to step through
the available settings until you reach the one you want.
4. When finished, press globals again to exit.

Pressing the globals button three times in a row saves the current program as
the default program that appears when you turn on the OB-6.

OB-6 Operation Manual

Globals

Manual
The manual switch toggles “live panel” mode on and off. In live panel
mode the OB-6 ignores the currently active preset and reverts to the
current front-panel settings of its knobs and switches. In other words,
what you see on the front panel is what you hear. This is a great mode for
learning, experimentation, and instant gratification.
MANUAL

The Manual button

To enter live panel mode:

•

Press the manual button to toggle it on. The OB-6 is now in live panel
mode. What you see on the front panel is what you hear. Note that you
can’t change programs or banks with manual on.

To return to preset mode:

•

Press the manual button again to toggle it off. The LED is off. The
current program is what you hear.

Be aware when entering live panel mode that the current settings of the OB-6
knobs and switches may be such that no sound is produced. This could because the
Mixer levels are all set to zero, or some other reason. See Appendix B: Troubleshooting and Support for a checklist that can help you identify the cause.

Manual

Dave Smith Instruments

Pitch and Mod Wheels
The OB-6 has a spring-loaded Pitch wheel and a Mod wheel. You can
use these controls to enhance live performance by bending notes and
adding modulation in real time as you play.
In the same way that guitar players use note bends and vibrato to give
their playing expressiveness and character, these two controls can really
help you define your sound as a performer and take you beyond just
playing notes on the keyboard.

Pitch

Mod

The Pitch and Modulation wheels

Pitch Wheel
You can set a range in semitones for the Pitch wheel, depending on your
playing preference. The range is up to 12 semitones (1 octave). Many
musicians use a range of 2 semitones (a whole step) since this is the bend
range of many acoustic instruments. For guitar whammy bar effects, you
many wish to set a wider range.
To set the pitch bend range:

1. Press and hold the whl range button.
2. With the button still held down, use the bank/decrement and tens/
increment switches to choose the number of semitones (up to 12) for
the pitch bend range, then release the whl range button.

OB-6 Operation Manual

Pitch and Mod Wheels

Modulation Wheel
The Mod wheel controls the amount of modulation applied to any destinations chosen in the low-frequency oscillator section. This allows you to
“perform” LFO modulation in real time by moving the Mod wheel. This is a
great way to add expressiveness to a sound or performance.
To choose a modulation destination for the Mod wheel:

1. In the low-frequency oscillator section, choose a modulation destination as well as a shape and frequency for the LFO. (See “Low
Frequency Oscillators” on page 34 for more details.)
2. To apply modulation only when using the Mod wheel, set the initial
amt knob to zero. (Turning this knob up will apply LFO modulation
continuously — not just when the Mod wheel is used.)

Many programs use the Mod wheel to add vibrato. In this case, vco 1 and vco 2
are enabled as modulation destinations in the low-frequency oscillator section. This
adds vibrato when you push the mod wheel forward. Set the initial amt knob to zero to
apply vibrato only when using the Mod wheel.

Aftertouch
Aftertouch is a performance feature that allows you to add modulation to
a sound by applying additional pressure to a key after the key is already
down. The greater the pressure applied, the more modulation is applied.
The OB-6 provides monophonic (or “channel”) aftertouch, which means
that applying pressure to any key within a chord will apply modulation
to all notes currently held.
The Aftertouch section lets you choose the amount of modulation
applied using aftertouch and which parameters are modulated (oscillator
frequency, filter frequency, etc.). You can set either a positive or negative
amount.
For example, if you select the filter cutoff frequency as destination (filt
freq), set a positive amount of aftertouch, then press the keys harder, the
filter cutoff frequency will increase, making the filter open wider and the
sound become brighter.

Aftertouch

Dave Smith Instruments

Conversely, if you select the filter frequency as destination, set a negative amount of aftertouch, then press the keys harder, the filter cutoff
frequency will be lowered, making the filter close more and the sound
become more muted.

The OB-6 provides four different aftertouch response settings for your convenience. The default setting provides a linear response. To choose a different response
curve, use the at response button in the globals section. See page 14 for more
details.

AFTERTOUCH
AMOUNT

VCO 1

VCO 2

LFO AMT

LOUDNESS

FILTR FREQ FILTR MODE

The Aftertouch controls

Amount: Selects the amount of aftertouch applied to a selected destination. Positive amount settings apply positive amounts of modulation.
Negative amount settings apply negative amounts of modulation.
VCO 1: Selects Oscillator 1 frequency as an aftertouch modulation destination. With a positive amount setting, pressing the keys harder will shift
the Oscillator 1 pitch upward. With a negative amount setting, pressing
the keys harder will shift the Oscillator 1 pitch downward.

OB-6 Operation Manual

Aftertouch

VCO 2: Selects Oscillator 2 frequency as an aftertouch modulation destination. With a positive amount setting, pressing the keys harder will shift
the Oscillator 2 pitch upward. With a negative amount setting, pressing
the keys harder will shift the Oscillator 2 pitch downward.
LFO Amount: Selects the lfo amount parameter as an aftertouch modu-

lation destination. With a positive amount setting, pressing the keys
harder will increase the amount of LFO modulation to any destination selected in the low-frequency oscillator section. With a negative
amount setting, pressing the keys harder will increase the amount of
LFO modulation — with the LFO waveform inverted.

Loudness: Selects Amplitude as an aftertouch modulation destination.
With a positive amount setting, pressing the keys harder will increase
the volume of a sound. With a negative amount setting, pressing the keys
harder will decrease the volume of a sound.

If the Loudness Envelope’s amount is set to full, positive amounts of loudness
aftertouch will have no effect since the VCA is already at its maximum output level.

Filtr Freq: Selects the filter cutoff frequency as a modulation destination.

With a positive amount setting, pressing the keys harder will open the
filter wider and make a sound become brighter. With a negative amount
setting, pressing the keys harder will close the filter more and make a
sound more muted.
Filtr Mode: Selects the Filter Mode as a modulation destination. With a

positive amount setting, pressing the keys harder will move smoothly
between low-pass, notch, and high-pass filter modes.

Aftertouch

Dave Smith Instruments

Exporting Programs and Banks
You can use the pgm dump command in the globals section to transmit the
current program, bank, or all banks in SysEx format via the selected
MIDI port. This allows you to save your programs so that you can share
them or archive them.
To export a program or bank as a SysEx file over MIDI:

1. Press the globals button once (this enables the upper set of parameters)
then press program selector 8 to select the midi sysex command.
2. Use the bank/decrement and tens/increment buttons to select the
appropriate MIDI port — MIDI (MID) or USB (usb).
3. Press globals a second time (this enables the lower set of parameters)
then press program selector 8 to select the pgm dump command. The
write button begins flashing.
4. Use the bank/decrement and tens/increment buttons to select the
desired option — program (PRO), tens (ten), bank (ban), user banks
(USR), all (all).
5. Press write. The program or bank is exported.

Dumped programs will load back into the same bank and program location in
memory when received by the OB-6 via MIDI.

OB-6 Operation Manual

Exporting Programs and Banks

Calibrating the OB-6
The OB-6 is calibrated at the factory. Controls such as the pitch and mod
wheels shouldn’t require re-calibration. However, because its oscillators and filters are voltage controlled and can be affected by extremes of
temperature, you may need to use the built-in calibration function to tune
them occasionally.

How and When to Calibrate the Oscillators and Filters
The first time you use the OB-6, please run its built-in oscillator and
filter calibration procedure. Let it warm up for several minutes and come
to its normal operating temperature before doing so.
Repeat the calibration procedure as needed over the next few days of
use. The OB-6 learns the range of temperatures at your location and will
keep itself in tune over this range.
Later, if you use the OB-6 in a different environment that is measurably
warmer or cooler (on stage, in an air-conditioned studio, and so on) run
the calibration procedure again.
To calibrate the oscillators and filters:

1. Hold down the manual button and press 0.
2. The front panel LEDs and display begin flashing as the OB-6 performs
its auto-calibration procedure. Don’t turn off the power while it’s doing
this.
3. When finished, the front panel controls will return to normal and you
can play the OB-6 again.

Calibrating the OB-6

Dave Smith Instruments

Calibrating the Pitch and Mod Wheels
In general, the Pitch and Mod wheels shouldn’t require re-calibration.
However, if you experience what seems like a persistent problem with
either of them, the OB-6 has built-in auto-calibration procedure that you
can use to remedy the problem.
To calibrate the Pitch and Mod wheel’s low position:

1. Rotate and hold both wheels in their low position.
2. Hold down the manual button and press 7.
To calibrate the Pitch wheel’s center position:

•

With the Pitch wheel centered, hold down the manual button and press 8.

To calibrate the Pitch and Mod wheel’s high position:

1. Rotate and hold both wheels in their high position.
2. Hold down the manual button and press 9.

Resetting the Global Parameters
If you’re trying to track down a problem, it’s sometimes a good idea to
reset the Global parameters to their defaults. This is a quick way to make
sure that the OB-6 returns to its factory settings.
To reset all Global parameters to their default settings:

•

Hold down the global button and press write.

OB-6 Operation Manual

Calibrating the OB-6

Using USB
The OB-6’s USB 2.0 port enables bidirectional MIDI communication
with a computer. A MIDI interface and MIDI cables are not necessary, just a USB cable. The OB-6 is a Class Compliant USB device.
That means it does not require any additional drivers to be installed to
communicate with a Mac or Windows computer. The OB-6 transmits and
receives MIDI data via USB, but does not transmit audio.

MIDI In and USB should not be used at the same time, as overlapping
messages from different sources may cause the OB-6 to respond unpredictably. MIDI
Out and USB can be used at the same time and transmit the same data.

USB Notes
Under Mac OS X, “OB-6 Keyboard” will appear as a MIDI port when
connected via USB and can be configured using the Mac’s Audio MIDI
Setup utility (typically found in Applications/Utilities).
Under Windows, the first time the OB-6 is connected via USB, the
“Found new hardware” alert appears and it is automatically installed as
“OB-6 Keyboard.”
In Windows, if you unplug the USB cable and plug it back in while a
program has the OB-6 port open, you may have to resync. That usually
means going to the OB-6 Keyboard Properties — in the Windows
Device Manager under “Sound, video, and game controllers” — and
clicking OK. If OB-6 Keyboard is no longer listed in the Device
Manager, power the OB-6 down and back up again while it is connected
via USB. It should be detected on power up.

Using USB

Dave Smith Instruments

Appendix A: Alternative Tunings
By default, the OB-6 is set to standard, chromatic western tuning. Additionally it supports up to 16 additional alternative tunings, which you can
access using the alt tuning button in the globals section.
From the factory, the OB-6 ships with 16 preset alternative tunings
ranging from Equal temperament to Indonesian Gamelan tunings. If you
want, you can replace these with other tunings that you can find on the
Internet. These must be in SysEx format. You can download them into
the OB-6 using SysEx Librarian for Mac or MIDI-OX for Windows.
Here are descriptions of the default alternative tunings:
Nor (Normal) 12 Tone Equal Temperament (non-erasable)
The default Western tuning, based on the twelfth root of two.
1. Harmonic Series
MIDI notes 36-95 reflect harmonics 2 through 60 based on the fundamental of A = 27.5 Hz. The low C on a standard 5 octave keyboard acts
as the root note (55Hz), and the harmonics play upwards from there. The
remaining keys above and below the 5 octave range are filled with the
same intervals as Carlos’ Harmonic 12 Tone that follows.
2. Carlos Harmonic Twelve Tone
Wendy Carlos’ twelve note scale based on octave-repeating harmonics.
A = 1/1 (440 Hz). 1/1 17/16 9/8 19/16 5/4 21/16 11/8 3/2 13/8 27/16 7/4
15/8
3. Meantone Temperament
An early tempered tuning, with better thirds than 12ET. Sounds best in
the key of C. Use this to add an authentic touch to performances of early
Baroque music. C=1/1 (260 Hz)
4. 1/4 Tone Equal Temperament
24 notes per octave, equally spaced 24root2 intervals. Mexican composer
Julian Carillo used this for custom-built pianos in the early 20th century.

OB-6 Operation Manual

Appendix A: Alternative Tunings

5. 19 Tone Equal Temperament
19 notes per octave (19root2) offering better thirds than 12 ET, a better
overall compromise if you can figure out the keyboard patterns.
6. 31 Tone Equal Temperament
Many people consider 31root2 to offer the best compromise towards just
intonation in an equal temperament, but it can get very tricky to keep
track of the intervals.
7. Pythagorean C
One of the earliest tuning systems known from history, the Pythagorean
scale is constructed from an upward series of pure fifths (3/2) transposed
down into a single octave. The tuning works well for monophonic melodies against fifth drones, but has a very narrow palate of good chords to
choose from. C=1/1 (261.625 Hz)
1/1 256/243 9/8 32/27 81/64 4/3 729/512 3/2 128/81 27/16 16/9 243/128
8. Just Intonation in A with 7-limit Tritone at D#
A rather vanilla 5-limit small interval JI, except for a single 7/5 tritone
at D#, which offers some nice possibilities for rotating around bluesy
sevenths. A=1/1 (440 Hz) 1/1 16/15 9/8 6/5 5/4 7/5 3/2 8/5 5/3 9/5 15/8
9. 3-5 Lattice in A
A pure 3 and 5-limit tuning which resolves to very symmetrical derived
relationships between notes. A=1/1 (440 Hz)
1/1 16/15 10/9 6/5 5/4 4/3 64/45 3/2 8/5 5/3 16/9 15/8
10. 3-7 Lattice in A
A pure 3 and 7-limit tuning which resolves to very symmetrical derived
relationships between notes. Some of the intervals are very close
together, offering several choices for the same nominal chords. A=1/1
(440 Hz)
1/1 9/8 8/7 7/6 9/7 21/16 4/3 3/2 32/21 12/7 7/4 63/32

Appendix A: Alternative Tunings

Dave Smith Instruments

11. Other Music 7-Limit Black Keys in C
Created by the group Other Music for their homemade gamelan, this
offers a wide range of interesting chords and modes. C=1/1 (261.625 Hz)
1/1 15/14 9/8 7/6 5/4 4/3 7/5 3/2 14/9 5/3 7/4 15/8
12. Dan Schmidt Pelog/Slendro
Created for the Berkeley Gamelan group, this tuning fits an Indonesianstyle heptatonic Pelog on the white keys and pentatonic Slendro on the
black keys, with B and Bb acting as 1/1 for their respective modes. Note
that some of the notes will have the same frequency. By tuning the 1/1 to
60 Hz, Dan found a creative way to incorporate the inevitable line hum
into his scale. Bb, B = 1/1 (60 Hz)
1/1 1/1 9/8 7/6 5/4 4/3 11/8 3/2 3/2 7/4 7/4 15/8
13. Yamaha Just Major C
When Yamaha decided to put preset microtunings into their FM synth
product line, they selected this and the following tuning as representative
just intonations. As such, they became the de-facto introduction to JI for
many people. Just Major gives preferential treatment to major thirds on
the sharps, and a good fourth relative to the second. C= 1/1 (261.625)
1/1 16/15 9/8 6/5 5/4 4/3 45/32 3/2 8/5 5/3 16/9 15/8
14. Yamaha Just Minor C
Similar to Yamaha’s preset Just Major, the Just Minor gives preferential
treatment to minor thirds on the sharps, and has a good fifth relative to
the second. C= 1/1 (261.625) 1/1 25/24 10/9 6/5 5/4 4/3 45/32 3/2 8/5
5/3 16/9 15/8

OB-6 Operation Manual

Appendix A: Alternative Tunings

15. Harry Partch 11-limit 43 Note Just Intonation
One of the pioneers of modern microtonal composition, Partch built
a unique orchestra with this tuning during the first half of the 20th
century, to perform his own compositions. The large number of intervals
in this very dense scale offers a full vocabulary of expressive chords
and complex key changes. The narrow spacing also allows fixedpitched instruments like marimbas and organs to perform glissando-like
passages. G = 1/1 (392 Hz, MIDI note 67)
1/1 81/80 33/32 21/20 16/15 12/11 11/10 10/9 9/8 8/7 7/6 32/27 6/5 11/9
5/4 14/11 9/7 21/16 4/3 27/20 11/8 7/5 10/7 16/11 40/27 3/2 32/21 14/9
11/7 8/5 18/11 5/3 27/16 12/7 7/4 16/9 9/5 20/11 11/6 15/8 40/21 64/33
160/81
16. Arabic 12-Tone
A 12-tone approximation of an Arabic scale, which appears in some electronic keyboards designed for use with Arabic music. Not a JI scale, nor
equal tempered. These are the intervals in Cents relative to C:
60 = Cents 0.
61 = Cents +151.
62 = Cents +204.
63 = Cents +294.
64 = Cents +355.
65 = Cents +498.
66 = Cents +649.
67 = Cents +702.
68 = Cents +853.
69 = Cents +906.
70 = Cents +996.
71 = Cents +1057.
72 = Cents +1200

Appendix A: Alternative Tunings

Dave Smith Instruments

Appendix B: Troubleshooting
and Support
Troubleshooting
If you’re experiencing problems or unexpected behavior from your
OB-6, here are a few typical scenarios and their solutions:
If the OB-6 isn’t producing sound in live panel mode:

1. Enable live panel mode by pressing the manual button.
2. Initialize a basic program by holding the manual button and pressing
the write button.
3. If the problem is still there, return the instrument to live panel mode
again and check all parameters to make sure they are at non-zero
values. These parameters include:
•

VCO 1 & 2 pitch

•

VCO 1 & 2 mixer levels

•

Program volume

•

Master volume

•

Set the Loudness Envelope amount to max. Use a fast envelope with Sustain at max.

•

Set VCO 1 & 2 to sawtooth

•

Set filter cutoff to max

•

Check all other parameters by physically changing them.

If the sequencer or arpeggiator has stopped running:

•

Check the MIDI Clock setting in the Globals to ensure the OB-6 is set
to out or, if set to in or slave thru, make sure the OB-6 is receiving
MIDI clock.

If some of the programs sound different than usual:

•

Check the Mod Wheel position. The Mod Wheel can do more than
just add vibrato. Also, check the Clock settings in the Global menu to
ensure the OB-6 is set to out or, if set to in or slave thru, make sure
the OB-6 is receiving MIDI clock.

OB-6 Operation Manual

Appendix B: Troubleshooting and Support

If there is a ground hum in the audio output:

•

USB can cause ground loops, so try to resolve any grounding issues
between the computer and the OB-6. Or use MIDI, which is opto-isolated.

If the OB-6 is behaving erratically.

•

This is almost always caused by a MIDI data loop. Make sure that any
MIDI Thru functionality is turned off on the MIDI interface/hardware
or in the MIDI software application. Disconnect all the OB-6’s MIDI
connections—MIDI and USB cables—and see if the problem persists.
You can also monitor the MIDI traffic with MIDI Monitor (Mac OS) or
MIDI-OX (Windows) to see if the OB-6 is being overrun with duplicate messages.

If the OB-6 doesn’t seem to respond to its controls:

•

Make sure Local Control is on in the Global settings.

If MIDI System Exclusive data is not transmitted/received:

•

Make sure that the MIDI SysEx setting in the Global settings is set to
usb or midi depending on which you are using to transmit or receive
MIDI messages.

If the OB-6 plays out of tune:

•

Check Transpose and Master Tune parameters in the Global settings. If
they seem correct, you may need to retune the oscillators. See “Calibrating the Prophet-6” on page 56. If this doesn’t help, recalibrate
the pitch and mod wheels. “Calibrating the Pitch and Mod Wheels” on
page 57.

If the pitch or mod wheel doesn’t go go full range:

•

Recalibrate the pitch and mod wheels. See “Calibrating the Pitch and
Mod Wheels” on page 57.

If the filter sounds strange or out of tune:

•

You may need to retune the filters. See “Calibrating the Prophet-6” on
page 56.

If the OS Fails to Load Correctly When You Update:

•

The OB-6 is equipped with a MIDI bootloader, which will allow you
to reload the OS in the event the you accidentally “brick” your synth
(permanently freeze it) while updating its OS.

Appendix B: Troubleshooting and Support

Dave Smith Instruments

To restore your OB-6 if it is frozen.

1. Power on the OB-6 while holding the Write switch to enter bootloader
mode. You’ll see an animation in the Effects Parameter 1 display.
2. Use a MIDI cable (not USB) to transmit the new OS to your synth. You
must use a standard MIDI cable for this. USB MIDI doesn’t work in
bootloader mode.
3. As the OS loads, you will see the main display count backwards from
999. When it gets to 0, another countdown will begin between the main
display and the FX Parameter 1 display. Do not power down until this
countdown has finished. The OB-6 will restart itself when it is done.

Contacting Technical Support
If you are still having a problem with the OB-6, contact Technical
Support at support@davesmithinstruments.com. Please include your
OB-6’s serial number, the version of the operating system (displayed in
the Global screen), and the purchase date.

If you have not already reset the Global parameters and run the calibration
routines (see Troubleshooting), you should do it before contacting Technical Support.
It’s probably the first thing they’ll ask you to do.

OB-6 Operation Manual

Appendix B: Troubleshooting and Support

Warranty Repair
Dave Smith Instruments warrants that the OB-6 will be free from defects
in materials and/or workmanship for 1 year from the date of purchase.
Please register your product online at www.davesmithinstruments.com
to establish the date of purchase. (This is not a requirement for warranty
service, but it will help expedite the process.)
Please contact support@davesmithinstruments.com to determine the best
course of action for getting your OB-6 repaired. For your own protection, as well as ours, please do not return any product to Dave Smith
Instruments without a return authorization (RA) number. To issue an RA
number, Technical Support needs:
•
•
•
•
•
•

Your name
Your return address
Your email address
A phone number where you can be reached
Your OB-6’s serial number
The date of purchase and where purchased

If you need to return your instrument for repair, you are responsible
for getting it to DSI. We highly recommend insuring it and packing in
the original packaging. Damage resulting from shipping a product with
insufficient packaging is not covered by warranty.

Appendix B: Troubleshooting and Support

Dave Smith Instruments

Appendix C: MIDI Implementation
The OB-6 receives MIDI data according to the settings you have chosen
in the global settings. In addition, there is interaction between some of
the Program parameters that determine the overall response of OB-6 to
MIDI data. Following are the Global parameters that affect response to
MIDI:
MIDI Channel: All, 1…16—Selects which MIDI channel to send and
receive data, 1 to 16. All receives on all 16 channels.
MIDI Clock: Sets the OB-6’s ability to send and receive MIDI clock

messages:
•

Off: MIDI Clock is neither sent nor received

•

Out: MIDI Clock is sent, but not received

•

In: MIDI Clock is received, but not sent

•

Slave Thru (i-0): MIDI Clock is received and passed to MIDI Out

•

In, No Start/Stop (n55): Receives MIDI Clock but does not respond to
MIDI Start or Stop command.

When set to in or slave thru, if no MIDI clock is present at the selected input,
the arpeggiator and sequencer will not function.

Clock Port: MID, USB—Sets the port(s), MIDI or USB, by which MIDI

clock signals are received.

Param Xmit: Off, CC, NR—Changes to the values of front panel controls

are transmitted via MIDI as Continuous Controllers (CC) or Non-registered
Parameter Number (NR). Transmission of parameters can also be turned off.

NRPNs are the preferred method of parameter transmission, since they cover
the complete range of all parameters, while CCs are limited to a range of 128.

Param Rcv: Off, CC, NR—Sets the method by which parameter changes are

received via MIDI. As with transmission, NRPNs are the preferred method.

OB-6 Operation Manual

Appendix C: MIDI Implementation

MIDI Control: Off, On—When On, the synth will respond to MIDI

controllers, including Pitch Wheel, Mod Wheel, Pedal, Volume.

MIDI Sysex: MID, USB— When set to MIDI (MID) it will receive and
transmit them using the MIDI ports/cables When set to USB it will
receive and transmit them using the USB port/cable. MIDI SysEx
messages are used when sending and receiving a variety of data including, programs, alternative tunings, system updates, and more.
MIDI Out: MID, USB—Sets the port by which MIDI data will be transmit-

ted (MIDI or USB)..

MIDI Messages
System Real-Time Messages
Status

Description

1111 1000

MIDI Timing Clock

Received Channel Messages
Status

Second

Third

Description

1000 nnnn

0kkkkkkk

0vvvvvvv

Note Off. Velocity is ignored

1001 nnnn

0kkkkkkk

0vvvvvvv

Note On. Note off if vvvvvvv = 0

1010 nnnn

0kkkkkkk

0vvvvvvv

Polyphonic Key Pressure

1011 nnnn

0vvvvvvv

Control Change; see “Received Controller Messages”

1100 nnnn

0ppppppp

1101 nnnn

0vvvvvvv

1110 nnnn

0vvvvvvv

Program change, 0-99 for Programs 1-100 within
current Bank
Channel Pressure
0vvvvvvv

Pitch Bend LS Byte then MS Byte

Notes: 0kkkkkkk
Note number 0 — 127
nnnn
Channel number 0 to 15 (MIDI channel 1-16).

Ignored if MIDI channel set to ALL
0vvvvvvv Value

Appendix C: MIDI Implementation

Dave Smith Instruments

Received Controller Messages
Status

Second

Third

Description

1011 nnnn

0vvvvvvv

Mod Wheel: directly assignable controller

1011 nnnn

0vvvvvvv

Foot Controller: directly assignable controller

1011 nnnn

0vvvvvvv

Volume: Combined with Master Volume and Voice
Volume

1011 nnnn

0vvvvvvv

Brightness: Added to filter cutoff frequency

1011 nnnn

0vvvvvvv

Bank Select: 0 - 4 select user banks 0 - 4; 5 - 9 select
factory banks 0 - 4; others ignored

1011 nnnn

0vvvvvvv

Damper pedal: Holds envelopes in Sustain if 0100 0000
or higher

1011 nnnn

123

0vvvvvvv

All Notes Off: Clear all MIDI notes

1011 nnnn

121

0vvvvvvv

Reset All Controllers: Clears all MIDI controllers to 0,
MIDI volume to maximum

See sections below for additional Continuous Controller (CC) and Nonregistered Parameter Number (NRPN) messages received.
Transmitted Channel Messages
Status

Second

Third

Description

1000 nnnn

0kkkkkkk

0000000

Note Off.

1001 nnnn

0kkkkkkk

0vvvvvvv

Note On.

1011 nnnn

0vvvvvvv

Control Change; see “Transmitted Controller Messages”

1100 nnnn

0ppppppp

1101 nnnn

0vvvvvvv

1110 nnnn

0vvvvvvv

Program change, 0-99 for Programs 00-99 within
current Bank
Channel Pressure
0vvvvvvv

Pitch Bend LS Byte then MS Byte

Notes: 0kkkkkkk
Note number 0 — 127
nnnn
Channel number 0 to 15 (MIDI channel 1-16).

Ignored if MIDI channel set to ALL
0vvvvvvv Value

OB-6 Operation Manual

Appendix C: MIDI Implementation

Transmitted Controller Messages
Status

Second

Third

Description

1011 nnnn

0000 0001

0vvvvvvv

Mod Wheel

1011 nnnn

0000 0100

0vvvvvvv

Foot Controller: When assigned to Pedal 1 or Pedal 2

1011 nnnn

0000 0111

0vvvvvvv

Volume: When assigned to Pedal 1 or Pedal 2

1011 nnnn

0100 1010

0vvvvvvv

Brightness: When assigned to Pedal 1 or Pedal 2

1011 nnnn

0010 0000

0vvvvvvv

Bank Select: 0 - 9

1011 nnnn

0100 0000

0vvvvvvv

Damper pedal: Sends 0 if off, 0111 1111 when on

1011 nnnn

0000 0111

0vvvvvvv

Volume knob

See sections that follow for additional Continuous Controller (CC) and
Non-registered Parameter Number (NRPN) messages transmitted.

Appendix C: MIDI Implementation

Dave Smith Instruments

Additional Continuous Controllers Transmitted/Received
The following table details how MIDI Continuous Controllers (CCs) are
mapped to OB-6 controls. They are transmitted when Param Xmit is set
to CC, and recognized/received when MIDI Rcv Receive is set to CC.
CC#

Param

CC#

Param

Bank Select MSB

Brightness

Mod Wheel

Osc 2 Freq

BPM

Osc 2 Detune

Foot Controller

Osc 2 Level

Portamento Time

Osc 2 Shape

Data Enttry MSB

Osc 2 Pulse Width

MIDI Volume

Data Increment

Sub Octave Level

Data Decrement

Distortion Amount

NRPN Param LSB

Data Entry LSB

NRPN Param MSB

Volume LSB

100

RPN Param LSB

VCA Env Amt

101

RPN Param MSB

VCA Env Vel Amt

102

Filter Freq

VCA Env Attack

103

Filter Resonance

VCA Env Decay

104

Filter Key Amt

VCA Env Sustain

105

Filter Vel On/Off

VCA Env Release

106

Filter Mode

Filter Env Amt

107

Band Pass On/Off

Filter Env Attack

120

All Sound Off

Filter Env Decay

121

Reset Controllers

Filter Env Sustain

122

Local Control On/Off

Filter Env Release

123

All Notes Off

Arp On/Off

124

Omni Mode Off

Arp Mode

125

Omni Mode On

Arp Octave

126

Mono Mode On

Arp Clock Division

127

Poly Mode On

Damper Pedal

Portamento On/Off

Osc 1 Freq

Osc 1 Level

Osc 1 Shape

Osc 1 Pulse Width

OB-6 Operation Manual

Appendix C: MIDI Implementation

NRPN Messages
The Non-Registered Parameter Number (NRPN) MIDI messages are
used to transmit and receive both global and program parameters. They
are transmitted when MIDI Parameter Send is set to NRPN in Global,
and received when MIDI Parameter Receive is set to NRPN in Global.
The messages are handled in standard MIDI format using the NRPN CC
commands in running status byte format. Below is the format used for
transmitting a NRPN parameter.
Transmitted NRPN Messages
Status

Description

1011 nnnn

Control Change

0110 0011

NRPN parameter number MSB CC

0vvv vvvv

Parameter Number MSB

0110 0010

NRPN parameter number LSB CC

0vvv vvvv

Parameter Number LSB

0000 0110

NRPN parameter value MSB CC

0vvv vvvv

Parameter value MSB

0010 0110

NRPN parameter value LSB CC

0vvv vvvv

Parameter value LSB

The parameter number can be found in the two tables below, one for
Global parameters, and the other for Program parameters. The parameter
numbers and the parameter values are broken into two 7-bit bytes for
MIDI transmission; the LSB has the seven least-significant bits, and the
MSB has the seven most-significant bits, though in most cases the MSB
will be zero or one, and never more than two.
When receiving an NRPN, all messages do not necessarily need to be
transmitted, since the synth will track the most recent NRPN number,
though it is usually good practice to send the entire message above.
Once an NRPN is selected, the synth will also respond to NRPN Data
Increment and Decrement commands, which some controllers utilize.
Finally, it responds to one RPN (Registered Parameter Number)
command, the RPN/NRPN Reset command, which can be handy for
resetting the currently selected parameter to a known state.

Appendix C: MIDI Implementation

Dave Smith Instruments

Received NRPN Messages
Status

Second

Third

Description

1011 nnnn

0110 0011

0vvvvvvv

NRPN parameter number MSB CC

1011 nnnn

0110 0010

0vvvvvvv

NRPN parameter number LSB CC

1011 nnnn

0000 0110

0vvvvvvv

NRPN parameter value MSB CC

1011 nnnn

0010 0110

0vvvvvvv

NRPN parameter value LSB CC

1011 nnnn

0110 0000

0xxxxxxx

NRPN parameter value Increment

1011 nnnn

0110 0001

0xxxxxxx

NRPN parameter value Decrement

1011 nnnn

0010 0101

0111111

RPN parameter number MSB CC - Reset NRPN parameter number (when both MSB and LSB received)

1011 nnnn

0010 0100

0111111

RPN parameter number LSB CC - Reset NRPN parameter number (when both MSB and LSB received)

Global Parameter Data
The table shows the Global data sent and received on global parameter
dumps, and corresponding NRPN number when sent/received individually.
NRPN

Range

Description

NRPN

Range

Description

1024

0-100

Master Fine Tune

1033

0-3

1025

0-24

Master Coarse Tune

1026

0-16

MIDI Channel
0 = All

MIDI Out Select
0 = Off
1 = MIDI
2 = USB
3 = MIDI+USB

1027

0-3

MIDI Clock Mode
0 = Off
1 = Master
2 = Slave
3 = Slave Thru

1035

0-1

Local Control*
0 = Off
1 = On

1037

0-2

Pot Mode
0 = Relative
1= PassThru
2 = Jump

1039

0-3

Seq Jack
0 = normal
1= trigger
2= gate
3= trigger+gate

1040

0-3

Sustain Polarity
0 = normally open
1= normally closed
2= Sustain Normally Open/
Sequencer Normally Closed
3= Sustain Normally Closed/
Sequencer Normally Open

1028

0-1

MIDI Clock Port
0 = MIDI Port
1 = USB

1029

0-2

MIDI Param Send*
0 = NRPN
1 = CC
2= Off

1030

0-2

MIDI Param Receive†
0 = NRPN
1 = CC
2= Off

1031

0-1

MIDI Control Enable
0 = Off
1 = On

1041

0-3

Velocity Response

1042

0-3

Aftertouch Response

1032

0-1

MIDI SysEx Enable
0 = Off
1 = On

1043

0-1

Mono/Stereo
0 = Stereo
1 = Mono

1044

0-16

Alt Tuning

*Controller received, but not transmitted.
†Controller transmitted, but ignored when received.

OB-6 Operation Manual

Appendix C: MIDI Implementation

Program Parameter Data
The following table lists OB-6’s program parameters.
NRPN

Value

NRPN

Description

Value

Description

0-60

Osc 1 Freq

0-127

VCA Env Sustain

0-1

Osc 1 Sync

0-127

VCA Env Release

0-127

Osc 1 Level

0-1

VCA Env Vel On/Off

0-255

Osc 1 Shape

0-254

Filter Env Amt

0-255

Osc 1 Pulse Width

0-127

Filter Env Attack

0-60

Osc 2 Freq

0-127

Filter Env Decay

0-254

Osc 2 Freq Fine

0-127

Filter Env Sustain

0-127

Filter Env Release

0-127

Osc 2 Level

0-254

Osc 2 Shape

0-254

LFO Freq

0-255

Osc 2 Pulse Width

0-255

LFO Initial Amt

0-1

Osc 2 Low Freq

0-4

LFO Shape

0-1

Osc 2 Key On/Off

0-1

LFO Sync

0-127

Osc 1 Sub Level

0-1

0 -3

Portamento Mode

LFO Freq 1
Dest On/Off

0-1

Portamento On/Off

0-1

LFO Freq 2
Dest On/Off

0-127

Portamento Rate

0-1

0-12

Pbend Range

LFO PW 1, 2
Dest On/Off

0-127

Noise Level

0-1

LFO Amp Dest
On/Off,

0-127

Detune

0-1

LFO Filter Mode
Dest On/Off

0-1

LFO Amp Dest
On/Off

0-164

Filter Freq

0-255

Filter Res

0-2

Filter Key Amt

109

0-254

Pressure Amt

0-1

Filter Vel On

110

0-1

Pressure Freq 1
Dest On/Off

0-1

Filter mode

111

0-1

Filter Normal Bandpass

Pressure Freq 2
Dest On/Off

112

0-1

0-127

Voice Volume

Pressure Low-pass
Dest On/Off

0-127

Pan Spread

113

0-1

Pressure Filter
Mode Dest On/Off

0-127

Distortion Amt

0-127

VCA Env Amt

114

0-1

Pressure VCA
Dest On/Off

115

0-1

Pressure LFO Amt
Dest On/Off

0-127

VCA Env Attack

0-127

VCA Env Decay

Appendix C: MIDI Implementation

Dave Smith Instruments

NRPN

119

Value

Description

0-5

FX 1 Type

NRPN

Value

Description

448-511

0-127

Seq Step 1-64 Vel 2

512-575

12-108

Seq Step 1-64
Note 3

576-639

0-127

Seq Step 1-64 Vel 3

640-703

12-108

Seq Step 1-64
Note 4

120

0-127

FX 1 Mix

121

0-255

FX 1 Param 1

122

0-127

FX 1 Param 2

123

0-1

FX 1 Sync

127

0-9

FX 2 Type

704-767

0-127

Seq Step 1-64 Vel 4

128

0-127

FX 2 Mix

768-831

12-108

129

0-255

FX 2 Param 1

Seq Step 1-64
Note 5

130

0-127

FX 2 Param 2

131

0-1

FX 2 Sync

135

0-1

FX On/Off

143

0-254

832-895

0-127

Seq Step 1-64 Vel 5

896-959

12-108

Seq Step 1-64
Note 6

960-1023

0-127

Seq Step 1-64 Vel 6

XMod Filter Env Amt

1024

0-100

Tuning Fine

0-24

Tuning Coarse

144

0-254

XMod Osc 2 Amt

1025

145

0-1

XMod Freq 1 Dest
On/Off

1026

0-16

MIDI Channel

146

0-1

XMod Shape 1 Dest
On/Off

1027

0-4

MIDI Clock

147

0-1

XMod PW
1 Dest On/Off

148

0-1

XMod Filter Dest
On/Off

149

0-1

XMod Filter Mode
Dest On/Off

1028

0-1

MIDI Clock Port

1029

0-2

MIDI Param Send

1030

0-2

MIDI Param Receive

1031

0-1

MIDI MIDI Control

1032

0-1

MIDI SysEx Control

1033

0-3

MIDI Out

150

0-1

XMod Norm-Bandpass Dest On/Off,

1035

0-1

Local Control

156

0-1

Unison On/Off

1037

0-2

Pot Mode

157

0-6

Unison Mode

1039

0-3

Seq Jack

158

0-5

Key Mode

1040

0-3

Sustain Polarity

160

0-1

Arp On/Off

1041

0-3

Velocity Response

161

0-4

Arp mode

1042

0-3

At Response

162

0-2

Arp Range

1043

0-1

Stereo Mono

163

0-9

Arp Tim Sig

1044

0-16

Alt Tuning

1089

0-127

Seq Transpose

167

30-250

BPM

236-255

32 - 125

Name 0-19

256-319

12-108

Seq Step 1-64
Note 1

320-383

0-127

Seq Step 1-64 Vel 1

384-447

12-108

Seq Step 1-64
Note 2

OB-6 Operation Manual

Appendix C: MIDI Implementation

Control NRPN Data
The following table lists the OB-6’s control NRPN data. It is received
and transmitted but not saved as part of a program.
NRPN

Value

Description

1088

0-1

Seq Play/Stop

16256

0-1

Seq Rec On/Off

Sysex Messages
Universal System Exclusive Message (Device Inquiry)
Status

Description

1111 0000

System Exclusive (SysEx)

0111 1110

Non-realtime message

0vvv vvvv

If MIDI channel is set to 1 - 16, 0vvvvvvv must match (unless MIDI Channel = ALL); always
responds if 0vvvvvvv = 0111 1111.

0000 0110

Inquiry Message

0000 0001

Inquiry Request

1111 0111

End of Exclusive (EOX)

The OB-6 responds with:
Status

Description

1111 0000

System Exclusive (SysEx)

0111 1110

Non-realtime message

0vvv vvvv

If MIDI Channel = ALL, 0vvvvvvv = 0111 1111. Otherwise 0vvvvvvv = Channel Number
0 - 15.

0000 0110

Inquiry Message

0000 0010

Inquiry Reply

0000 0001

DSI ID

0010 1101

OB-6 ID (Family LS)

0000 0001

Family MS

0000 0000

Family Member LS

0000 0000

Family Member MS

0jjj nnnn

Main Software version: jjj - Minor rev; nnnn - Major rev

1111 0111

End of Exclusive (EOX)

Appendix C: MIDI Implementation

Dave Smith Instruments

Request Program Dump
Status

Description

1111 0000

System Exclusive (SysEx)

0000 0001

DSI ID

0010 1110

OB-6 ID

0000 0101

Request Program Transmit

0000 00vv

Bank Number, 0 - 9

0vvv vvvv

Program Number, 0 - 99

1111 0111

End of Exclusive (EOX)

The OB-6 will respond by sending out the Program Data in the format
described below in Program Data Dump.
Request Program Edit Buffer Dump
Status

Description

1111 0000

System Exclusive (SysEx)

0000 0001

DSI ID

0010 1110

OB-6 ID

0000 0110

Request Program Edit Buffer Transmit

1111 0111

End of Exclusive (EOX)

The OB-6 will respond by sending out the current Program edit buffer in
the format described below in Program Edit Buffer Data Dump.
Request Global Parameter Dump
Status

Description

1111 0000

System Exclusive (SysEx)

0000 0001

DSI ID

0010 1110

OB-6 ID

0000 1110

Request Global Parameter Transmit

1111 0111

End of Exclusive (EOX)

The OB-6 will respond by sending out the current values of Global
Parameters in the format described in Global Parameters Data Dump.

OB-6 Operation Manual

Appendix C: MIDI Implementation

Program Data Dump
Status

Description

1111 0000

System Exclusive (SysEx)

0000 0001

DSI ID

0010 1110

OB-6 ID

0000 0010

Program Data

0000 00vv

Bank Number: 0 - 9

0vvv vvvv

Program Number: 0 - 99

0vvv vvvv

1024 bytes expanded to 1171 MIDI bytes in “packed MS bit” format

1111 0111

End of Exclusive (EOX)

Program Edit Buffer Data Dump
Status

Description

1111 0000

System Exclusive (SysEx)

0000 0001

DSI ID

0010 1110

OB-6 ID

0000 0011

Edit Buffer Data

0vvv vvvv

1024 bytes expanded to 1171 MIDI bytes in “packed MS bit” format

1111 0111

End of Exclusive (EOX)

Global Parameters Data Dump
Value

Description

1111 0000

System Exclusive (SysEx)

0000 0001

DSI ID

0010 1110

OB-6 ID

0000 1111

Main Parameter Data

0vvv vvvv

50 nibbles (LS then MS) for 25 Global parameters

1111 0111

End of Exclusive (EOX)

The Global Parameters Data Dump is not recognized when received; it is only
transmitted when requested. NRPN messages are used to change Globals.

Appendix C: MIDI Implementation

Dave Smith Instruments

Packed Data Format
Data is packed in 8 byte “packets”, with the MS bit stripped from 7 parameter bytes, and packed into an eighth byte, which is sent at the start of the 8
byte packet.
Example:
Input Data Packed MIDI data
1 A7 A6 A5 A4 A3 A2 A1 A0
2 B7 B6 B5 B4 B3 B2 B1 B0
3 C7 C6 C5 C4 C3 C2 C1 C0
4 D7 D6 D5 D4 D3 D2 D1 D0
5 E7 E6 E5 E4 E3 E2 E1 E0
6 F7 F6 F5 F4 F3 F2 F1 F0
7 G7 G6 G5 G4 G3 G2 G1 G0

1
2
3
4
5
6
7
8

00
00
00
00
00
00
00
00

G7
A6
B6
C6
D6
E6
F6
G6

F7
A5
B5
C5
D5
E5
F5
G5

E7
A4
B4
C4
D4
E4
F4
G4

D7
A3
B3
C3
D3
E3
F3
G3

C7
A2
B2
C2
D2
E2
F2
G2

B7
A1
B1
C1
D1
E1
F1
G1

A7
A0
B0
C0
D0
E0
F0
G0

This explains why it takes 1171 MIDI bytes to transmit 1024 Program data bytes.

OB-6 Operation Manual

Appendix C: MIDI Implementation

Dave Smith Instruments

Dave Smith Instruments LLC
1527 Stockton Street, 3rd Floor
San Francisco, CA 94133
USA
www.davesmithinstruments.com
DSI-10139R

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