I’ve been playing around with filters lately, especially the popular WSG resonant low-pass filter. It’s a really simple build and is ideal for putting a bit of warmth into the harsh square waves of my logic-based synths.
I did a quick experiment today, adding a home-brew vactrol to the cut-off pot, to make a junky LFO. Here’s a schematic, if you’re interested. You can hear it in this demo, where I’ve used the sinister tone generator as a source. There’s plenty more work to do on it yet but it’s pretty fun just as is.