This video, via MAKEN0ISE, takes a look at using the Make Noise Rene Cartesian sequencer as a non-linear quantizer.
The Rene is used to quantize external voltages by CV-addressing the X-CV input in Snake mode. Since each location’s value can be set independently, quantization can be as linear or non-linear as you prefer.
See James Cigler’s Rene 101: Charming the Snake for more info about Snake Mode:
For more info on the Rene, see the Make Noise site.