The Sequential Prophet 5 Rev1 is the first of three iterations of the original Prophet 5. All 3 models feature 2 oscillators per voice with saw, triangle, pulse and square waves. It also contains an LFO, 24db/octave low pass filter, VCA & cv/gate controls.The Rev1 is known to be fairly unreliable but has become a collector’s item due to its scarcity. For a more consistently reliable version of this synth the Prophet 5 Rev3, or the newly released Prophet 5 are great options.