Synths ⇝ Sequential Circuits ⇝ Sequential Circuits Prophet 600

The Prophet 600 is an analog subtractive synthesizer and was the first commercial synthesizer to support MIDI.

It uses Curtis 3340 chips for its VCOs and and Curtis 3372 chips for its VCA and VCF and has two oscillators per voice with triangle, saw, and pulse waveforms available. It also has an arpeggiator and a rudimentary two-track realtime-only sequencer.