Electric Druid. http://www.electricdruid.net/index.php?page=projects.lfo9 Nice, flexible LFO, ADSR using a cheap PIC, various filters using SSM, CEM. Documents on bits and bobs. I'm going to knock up the LFO module at some point, I like the idea of continuously variable PD (Phase Distortion) for an LFO. A modular synth made up of pretty much PIC modules?