Available as an assembled Module and as a DIY project.
This Module is currently available.
The Wavolver II produces a wide variety of evolving waveforms in response to an external control voltage. Driven by a triangle wave, it can produce an output wave that continuously evolves from a triangle to an antisymmetric pulse waveshape. In addition, the section of the antisymmetric waveform that is at a zero-volt level can be replaced by an evolving series of successively folded triangular sections, somewhat in the spirit of the popular Serge Wave Multiplier.
Also available with 4mm jacks for running alongside the EuroSerge system.
http://www.elby-designs.com/webtek/panther/if117-wavolver/if117.htm
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These merchants probably sell this module. Huh?