Created in collaboration with fellow synth titan Dave Smith, the OB-6 offers a classic Oberheim sound derived heavily from the circuits of the iconic SEM from 1975. Old-school sound, modern convenience. Supplier's Notes: The chart-topping Oberheim sound is here in the OB-6, a 6-voice analogue poly synth, marrying Tom's engineering artistry with Dave Smith's modern instrument design, adding more control, more nuance and more sonic flexibility than ever before. The OB-6 takes the classic bold Tom Oberheim sound - with its true voltage-controlled oscillators, 2-pole filter, and amplifiers - and adds modern enhancements such as studio-quality effects, a polyphonic step sequencer, an arpeggiator, and more. OB-6 includes 500 factory preset programs, ready to tweak and save in 500 rewritable user program slots. Quickly move from inspiration to creation, using your latest and greatest sounds. 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. 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. The OB-6 began the historic partnership between Oberheim and Sequential, ushering in a new era of instruments using Tom's classic designs. From its bold and powerful oscillators to the versatile and distinctive multimode state-variable filter, the OB-6 is a true analog masterpiece, perfectly suited for the rigors of studio and stage. The knob-per-function front panel puts virtually all OB-6 functions at your fingertips. 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. The OB-6 features X-Mod, which expands the tonal palette and makes it easy to create dramatic and unconventional sounds. Modulation sources are filter envelope and oscillator 2, both with bi-polar control. Destinations include oscillator 1 frequency, oscillator 1 shape, oscillator 1 pulse width, filter cutoff, and filter mode. The polyphonic step sequencer allows up to 64 steps and up to 6 notes per step. You can create sequences polyphonically, with rests, and sync to an external MIDI clock. The full-featured arpeggiator can be synced to external MIDI clock as well. Unison mode features configurable voice count (1-6 voices), chord memory, and key modes. This analogue powerhouse is packed into a four-octave, semi-weighted keyboard with velocity and channel aftertouch, making it perfect for stage or studio. Ins & outs Left/mono and right audio outputs (2 x 1/4" phone jack) Headphone output (stereo, 1/4" phone jack) MIDI In, Out, Thru USB for bidirectional MIDI communication Filter cutoff expression pedal input Volume expression pedal input Sustain footswitch input Sequencer start/stop footswitch input IEC AC power inlet for internal power supply (Operates worldwide on voltages between 100 and 240 volts at 50 to 60 Hz; 30 watts maximum power consumption)