Roman suggested that this stuff would even be of interest if you're not as insane as myself: You could still build a single voice - it's a very "economic" circuit. Just look at this ADSR: voltage controlled, and uses 1/2 LM324 + 1 CD4007 + 3 transistors ... http://www.oldcrows.net/~jhaible/polykorg/PS3200_Voice_Cards_orig.gif JH.