Have built a Thomas Henry LM-VCO and in the middle of building an Eddy Bergman / YuSynth ADSR and a VCA. Hooked up to an AI Synthesis Stereo Matrix Mixer and Hexinverter Mutant Brain with an Alesis QX-49 keyboard and SR-18 drum machine.
Unfortunately, not yet, my synthdiy skill is still introductory. I do have an idea of what filter I’d like to build (Steiner-Parker, but it’s in a queue with a slow rate of dequeue, right now :/