Available as an assembled Module and as a DIY project.
This Module is currently available.
Elby Designs IF117 Wavolver II Waveshaper
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. Ian Fritz used a circuit inspired by the Haible folder in the wavefolder part.
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?