Vintage SEM Tone
The OB-6 sound engine is inspired by Tom’s original SEM, the core of his acclaimed 4-voice and 8-voice synthesizers. It features two discrete voltage-controlled oscillators (plus sub-oscillator) per voice with continuously variable waveshapes (sawtooth and variable-width pulse, plus a triangle wave on oscillator 2). The classic Oberheim-inspired 2-pole, state-variable, resonant filter provides low-pass, high-pass, band-pass, and notch functionality. Voltage-controlled amplifiers complete the all-analog signal path.
Dual Effects
The dual effects section provides studio-quality reverbs, delays (standard and BBD), chorus, flangers, and faithful recreations of Tom’s original phase shifter and ring modulator. While the effects themselves are digital, with 24-bit, 48 kHz resolution, a true bypass maintains a full analog signal path.

X-Mod and Poly Step Sequencing
The knob-per-function front panel puts virtually all OB-6 functions at your fingertips. Included are 500 permanent factory programs and 500 rewritable user programs. Turning on the Manual button enables live panel mode, in which the sound of the OB-6 switches to its current front panel settings. In this state, what you see is what you hear.
Easy to Program
The knob-per-function front panel puts virtually all OB-6 functions at your fingertips. Included are 500 permanent factory programs and 500 rewritable user programs. Turning on the Manual button enables live panel mode, in which the sound of the OB-6 switches to its current front panel settings. In this state, what you see is what you hear.
Sequential OB-6 Features:
- 2 oscillators and sub oscillator per voice
- Continuously variable waveshapes
- State-variable filter
- 64-step polyphonic step sequencer
- Full-function arpeggiator
- 2 digital effects engines
- Knob-per-function top panel
- 49-note semi-weighted, velocity- and aftertouch-enabled keybed
Tech Specs
- Type:Keyboard Synthesizer with Sequencer
- Analog/Digital:Analog
- Number of Keys:49
- Type of Keys:Semi-weighted
- Aftertouch:Yes
- Velocity Sensitive:Yes
- Other Controllers:Pitchbend, mod wheel
- Polyphony:6 Notes
- Number of Presets:500 user, 500 factory programs
- Effects Types:Analog distortion, reverbs, delay, chorus, flanger, phase, ring modulator
- Sequencer:Polyphonic 64-step sequencer
- Audio Outputs:2 x 1/4″ (left, right)
- Headphones:1 x 1/4″
- USB:1 x USB Type B
- MIDI I/O:In/Out/Thru/USB
- Pedal Inputs:1 x volume expression, 1 x sustain, 1 x sequencer start/stop, 1 x filter cutoff expressoin
- Mod Matrix:2 Sources, 6 Destinations
- Height:4.6″
- Width:31.8″
- Depth:12.7″
- Weight:20.9 lbs.





















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