Wavefolder

Wavefolder with built-in VCA

The wavefolder has a five diode folder and two VCAs built in.
The idea of wavefolding is to create new harmonics to an input signal. It works best with non or less harmonic signals, like sinewave or triangle. To achieve timevariant foldings you need dynamic control of input signal. Add some modulated bias to input signal to obtain PWM of spectra.
VCA1 is input to folder.
VCA2 is normlised to 5V. So you can add some bias to create PWM in spectral sphere. Put a jack in VCA2 and use it as a standalone VCA, or use VCA2 as a second sound input to creat strange harmonic mixes.

https://klangbauköln.de/cologne/wavefolder-wave-multiplyer/