Phase Modulation

Some would say this is the pedantically correct term for frequency modulation (FM), as the act of causing a carrier oscillator to play back faster and slower (quickly changing its frequency to be higher and lower) is the same as advancing and retarding position (phase) of the normal playback of a waveform. But don’t get bogged down by terminology when creating an FM patch; just connect the output of one oscillator to the pitch input of another and go for it.