The Prophet VS Rackmount is one of the most unique synths from Sequential. It is a digital synth utilizing vector synthesis for sound generation. It contains 4 oscillators per voice with 127 waveforms. It also features 2 LFOs, a Curtis low pass analog filter with digital controls, envelopes, arpeggiator, built-in effects and is MIDI equipped. It is also available in a 61-Key keyboard version with the Sequential Prophet VS.