Project #2

Simple VCF found on electro-music.com. I like how the voltage control doesn't require an OTA (I'd like to save the precious few I've salvaged).

And right after I say this, I see on MFOS that there are some simple schematics from the WP-20 Synth.

While I have yet to breadboard it, the circuit looks simple enough. Most of the VCF schematics I've found have been like this from Scott Stites's site. I'm thinking the op-amp with the diodes in its feedback path could be extracted and used almost by itself to do some waveshaping. We shall see.