A musical demo of the Roland Promars Compuphonic from 1978. This guy accompanied the release of the Jupiter-4 and is basically its monophonic sibling, although it has some differences. The Promars has a “dual VCO” and it works as follows: The master VCO has sawtooth, square, variable pulse, sub oscillator and separate white noise. There is a second VCO (which also has its own sub oscillator) which is slaved to the waveshape and modulation of the master VCO, but can be tuned independently.