Dave Smith Instruments OB-6 6-voice Polyphonic Analog Synthesizer Designed by Dave Smith Six discrete analog voices 64-step sequencer Arpeggiator, phase shifter Deadly ring modulator The OB-6 is a once-in-a-lifetime collaboration between two of the most influential synth designers in history  Dave Smith and Tom Oberheim Its an all-analog, 6-voice poly synth with voltage-controlled oscillators, a state-variable filter, and voltage-controlled amplifiers, inspired by Toms original SEM design  the bedrock of his legendary 4-voice and 8-voice synthesizers Manufactured and sold by Dave Smith Instruments, the OB-6 features six discrete analog voices with two oscillators (plus sub oscillator) per voice, continuously variable waveshapes with triangle, sawtooth, and variable-width pulse waves, X-mod with 2 sources and 5 destination, a 64-step polyphonic step sequencer, dual digital effects that include faithful recreations of Toms acclaimed phase shifter and ring modulator, a full-featured arpeggiator, and a powerful, in-your-face, sonic signatur... This analog powerhouse is packed into a four-octave, semi-weighted keyboard with velocity and channel aftertouch, making it perfect for stage or studio