Toppobrillo Triple Wavefolder DIY (TWF)

Toppobrillo Triple Wavefolder DIY (TWF) with Grayscale panel

The Triple Wavefolder (TWF) module contains three independent, voltage-controlled waveshapers that were designed to accomplish simple but useful waveshaping tasks, as well as combine to produce a nearly infinite variety of complex non-linear synthesis functions such as those implemented by the Buchla and Serge modular systems in the 70's.
http://www.toppobrillo.com/TWF/TWF.html
http://www.toppobrillo.com/TWFDIY.html

This panel will fit existing factory-built Triple Wavefolder (TWF) modules, and will also work with the DIY PCBs available from SynthCube and Thonk.

http://grayscale.info/panels/toppobrillo-triple-wavefolder-twf-diy/