I think the first "synth" I ever built was this one: http://www.spontis.se/pdf/eti_csg.pdf The ETI "Complex Sound Generator" or "MiniSynth". It was OKish.... If I recall, I built it on stripboard, and built the keyboard out of clacky computer keyboard switches. But it made "choons". Neil -- http://www.njohnson.co.uk