The OB-6 is a once-in-a-lifetime collaboration between the two most influential designers in poly synth history, Dave Smith and Tom Oberheim. 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. No other modern analog poly synth can boast such a pedigree or such a massive, in-your-face sonic signature.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.Also present is 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.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.This analog powerhouse is packed into a four-octave, semi-weighted keyboard with velocity and channel aftertouch, making it perfect for stage or studio.Dave Smith Instruments OB-6 Keyboard Specifications:Oscillators:Two discrete VCOs per voiceContinuously variable wave shape (sawtooth and variable-width pulse, plus triangle on oscillator 2) per oscillatorPulse width per oscillatorHard sync: oscillator 1 syncs to oscillator 2Square wave sub-octave generator (oscillator 1) per voiceLow frequency mode (oscillator 2)Keyboard tracking on/off (oscillator 2)Oscillator detune amount for increased tuning instability, from subtle to extremeMixer:Oscillator 1 amountOscillator 1 sub-octave amountOscillator 2 amountWhite noise amountState-Variable Filter:Two-pole, resonant, filter per voice with low-pass, high-pass, band-pass, and notch functionality inspired by the original Oberheim SEM filterBi-polar filter envelope amountVelocity modulation of envelope amountKeyboard tracking: off, half, fullFilter Envelope:Four-stage (ADSR) envelope generatorVelocity modulation of envelope amountAmplifier Envelope:Four-stage (ADSR) envelope generatorVelocity modulation of envelope amountLow Frequency Oscillator:Five wave shapes: sine, sawtooth, reverse sawtooth, square, and random (sample and hold)Clock sync (internal or external MIDI clock)Initial amountMod destinations: oscillator 1 frequency, oscillator 2 frequency, oscillator 1 and 2 pulse width, filter cutoff, filter mode, ampX-Mod:Sources: filter envelope (bi-polar) and oscillator 2 (bi-polar)Destinations: oscillator 1 frequency, oscillator 1 shape, oscillator 1 pulse width, filter cutoff, filter mode, normal to bandpass filterAftertouch:Source: channel (mono) aftertouch with bi-polar amountDestinations: oscillator 1 frequency, oscillator 2 frequency, LFO amount, amplifier envelope amount, filter envelope amount, filtermodeClock:Master clock with tap tempoBPM control and displayMIDI clock syncArpeggiator:Selectable note value: 16th note, 8th note triplet, 8th note, dotted 8th note, quarter noteOne, two, or three octave rangeUp, down, up/down, random, and assign modesSequencer:Polyphonic step sequencer with up to 64 steps and restsEffects:Stereo analog distortionDual, 24-bit, 48 kHz digital effects, including: reverb (room, hall, plate, spring), delay (full bandwidth digital delay and emulated bucket brigade), chorus, flanger, phase shifters, and ring modulatorDelay syncTrue bypass maintains fully analog signal path when digital effects are offPerformance Controls:Full-sized, semi-weighted, 4-octave keyboard with velocity and aftertouchBacklit pitch and mod ... Sequential OB-