It derives a rectangle signal with adjustable pulsewidth from an external triangle, sawtooth or sine wave. The external signal can be an LFO, VCO or any other signal with falling/rising slopes (e.g. ADSR). In addition the pulsewidth can be modulated by a CV signal (e.g. LFO or ADSR).

The typical application is the generation of a rectangle signal with PWM from VCOs or LFOs which do not yet have this feature (for example: A-110-4, A-145, A-147-2, A-143-4, A-143-9).