SEQUENTIAL OB-6 Keyboard

Sequential OB-6 Keyboard — 6-voice analog synthesizer with a 49-key semi-weighted keyboard, aftertouch, dual digital effects engine (24-bit/48kHz), 2-pole filter, and 64-step polyphonic sequencer.

A collaboration between legends Dave Smith and Tom Oberheim, the OB-6 combines Oberheim’s classic bold SEM sound with modern features like studio-grade effects, a powerful step sequencer, arpeggiator, and intuitive knob-per-function interface. With two discrete VCOs per voice, a classic state-variable 2-pole filter, and analog VCAs, the signal path remains purely analog for warm and expressive tones.

OB-6 offers deep modulation via X-Mod, allowing dramatic timbral shifts using the filter envelope and oscillator 2 as bipolar sources. The 64-step polyphonic sequencer and flexible arpeggiator expand creative potential, supporting rests, synced playback, and unison voice stacking. A dual FX section adds stereo reverb, delay, chorus, flanger, plus Oberheim-style phaser and ring mod — with true analog bypass to maintain full signal integrity.

With 500 factory and 500 user presets, plus a ‘Live Panel’ mode that reflects real-time knob positions, the OB-6 is a sound designer’s dream with immediate hands-on control. Its semi-weighted 4-octave keyboard with velocity and aftertouch makes it equally suited for live performance and studio work.

KEY FEATURES

• 6-voice analog synthesizer with discrete VCOs and VCAs
• 49-key semi-weighted keyboard with velocity and aftertouch
• 2-pole resonant state-variable filter with LP, HP, BP, and notch modes
• Filter and amplifier ADSR envelopes
• LFO with 5 waveforms
• X-Mod section for extended modulation routing
• 64-step polyphonic sequencer with rests and per-step note memory
• Arpeggiator with multiple timing options and sync
• Dual 24-bit/48kHz digital effects with analog distortion and true bypass
• 500 factory + 500 user presets with Direct Program Access
• Walnut side panels and live panel mode

TECHNICAL SPECIFICATIONS

• Sound engine: All-analog signal path with digital effects
• Polyphony: 6 voices
• Keyboard: 49 keys, semi-weighted, velocity and aftertouch sensitive
• Sequencer: 64-step polyphonic
• Arpeggiator: Yes
• Modulation: X-Mod section and 1 LFO
• Presets: 1000 (500 factory + 500 user)
• Audio outputs: Stereo L/R (1/4” TRS), headphones (1/4” TRS)
• Pedal inputs: Sustain, Volume, Expression, Sequencer Start/Stop
• MIDI: In, Out, Thru; USB MIDI
• Dimensions (W x H x D): 80.2 x 10.3 x 31.8 cm
• Weight: 9.5 kg
• Power: Internal PSU, 100–240V universal input