The bold, classic Oberheim poly sound – in a compact desktop module. The Sequential OB-6 Desktop is a 6-voice analog polyphonic synthesizer created by Tom Oberheim and Dave Smith. Its sound engine is inspired by Tom’s original SEM, with true voltage-controlled oscillators, a 2-pole multimode filter and analog amplifiers, plus modern effects, a sequencer and an arpeggiator. The module has all the same controls as the keyboard version, with no menu diving.
Why customers choose it
- SEM roots: two discrete VCOs per voice with continuously variable sawtooth and pulse (plus triangle on oscillator 2), hard sync, a square-wave sub-octave and white noise.
- The famous filter: a 2-pole resonant filter per voice that sweeps through low-pass, notch, high-pass and band-pass, inspired by the original Oberheim SEM filter.
- X-Mod: filter envelope and oscillator 2 modulate oscillator 1, its shape and pulse width, filter cutoff and filter mode for dramatic sounds.
- Effects: stereo analog distortion and dual 24-bit / 48 kHz digital effects – reverbs, delays (standard and BBD), chorus, flanger, phase shifter and ring modulator – with true bypass.
- Ready to play: 500 factory and 500 user programs, arpeggiator, polyphonic step sequencer up to 64 steps, unison with chord memory and tap tempo.
- Grow it: poly chain any two OB-6s for 12-voice polyphony.
Who it is for
Producers with a MIDI keyboard or controller who want the Oberheim analog sound in a smaller space, and players who want to add voices to an OB-6 keyboard by poly chaining.
Specifications
| Type | Analog polyphonic synthesizer, desktop module |
|---|---|
| Voices | 6 |
| Oscillators | 2 discrete VCOs per voice + sub-octave, white noise |
| Filter | 2-pole resonant multimode (LP, HP, BP, notch), SEM-inspired |
| Envelopes | ADSR filter, ADSR amp, with velocity |
| LFO | 1, syncable, 5 wave shapes |
| Effects | Stereo analog distortion; dual 24-bit / 48 kHz digital effects |
| Sequencer | Polyphonic, up to 64 steps; arpeggiator |
| Programs | 500 user + 500 factory |
| Outputs | Left/mono and right (2 x 1/4″), stereo headphone (1/4″) |
| MIDI | MIDI in, out, thru; USB MIDI |
| Pedal inputs | Filter cutoff expression, volume expression, sequencer start/stop footswitch |
| Power | Internal supply, IEC inlet, 100-240 V, 50-60 Hz, 30 W max |
| Dimensions | 52.0 x 19.8 x 11.2 cm |
| Weight | approx. 5.9 kg |
Good to know
- Manual switch on = live panel: what you see is what you hear.
- No keyboard – play it from a MIDI keyboard, controller or DAW over 5-pin MIDI or USB.
- USB is class compliant – no drivers needed on Mac or Windows.
FAQ
Is it fully analog?
The voices (VCOs, filters, amplifiers) are analog. The effects are digital, with true bypass so the path stays fully analog when they are off.
Can it sync with my DAW?
Yes. The clock, arpeggiator and sequencer sync to external MIDI clock over MIDI or USB.
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