The CV Twister / Wave Warper is a Eurorack Module that uses a circuit adapted from the Sandin Image Processor. The original circuit was used to give ‘solarized’ effects to video signals, and has been redesigned to make a nice low-parts count control voltage twister / wave warper circuit for audio synthesis.
The bandwidth is limited by the op-amp type, and should extend above 20 Khz with this design. The sections could also be 3/4 of a quad op-amp. The 5.1K resistors and 10K pots could also be 47K or 51K and the pots 100K. The higher current of the 10K makes the breakpoints a little sharper, but it should still work with the higher resistances.
BOM & Schematic – Bomono CV Twister