multi-band distortion processor

This is the 1st prototype of this module, though it only needs a few tweaks to get the gains of each channel more equal and some minor changes to the panel.

Basically it splits the input signals into 4 frequency bands, these go into fuzz circuits and vactrol based VCAs, then summed to the output or use the individual channel outputs. You can blend the clean/distorted signal and vary the fuzz characteristics.

note: current panels are white/gold