Homebuilt XR2206 (Thomas Henry design, Bugbrand PCB layout). Excellent little VCO. Modulated by SAS-VCO :).
Hey! Found a small and easy to build schematic based on the Roland TR-606. LM2904 is replaced with LM358 in my build. Recording is just as dry as it gets.
GEM F-20 has a built in reverb, standard springs. Sounds really nice in a modular setup.