OB-6 Keyboard

Born from a collaboration between Sequential and Tom Oberheim, this synth revives the iconic SEM filter in a modern 6-voice analog powerhouse, delivering that classic Oberheim warmth with a twist of contemporary control.

At its core, two discrete VCOs per voice offer continuously variable waveforms from sawtooth to pulse and triangle, complete with hard sync, sub-octave generators, and detune for everything from subtle chorusing to wild instability. The standout SEM-inspired filter provides low-pass, high-pass, band-pass, and notch modes with resonance that sings, paired with cross-modulation and dual envelopes for dynamic shaping. A 49-key semi-weighted keyboard with velocity and channel aftertouch feels responsive under your fingers, while backlit pitch and mod wheels, plus a spring-loaded pitch bend, make performance intuitive. Multimode arpeggiator, 64-step polyphonic sequencer, unison with chord memory, stereo analog distortion, and dual digital effects like lush reverbs, synced delays, and Oberheim's signature phaser round out the signal path—all with true bypass to keep the analog pure. MIDI, USB, and pedal inputs ensure seamless integration.

Players love its fat, organic tones that cut through mixes, praising the hands-on panel and vast preset library of 500 factory plus 500 user sounds. Some note the digital effects can feel secondary to the raw analog core, but that's part of its charm for purists.