Used to generate complex, repetitive waveforms. The desired waveform is approximated by setting the instantaneous amplitude of each of 32 increments. Aural feedback, random knob-twiddling, and (desirably) and accessory oscilloscope contribute to achieving the desired sound. Frequency is continuously variable from 1 cps to 2 kc and may be controlled internally or with an externally applied voltage. The instrument may be frequency modulated and a synchronizing trigger is provided to facilitate oscilloscope monitoring.