Thanks so much David. I'm sure I can find a Frys - or do a mouser order with quick shipping or something. I'll get some 4016 ICs. Do you think it could also be the 4069 (IC 23) or one of those two 4558 op amps (IC 21 and 22)? It now seems to be on two voices (maybe both had the issue before and I didn't notice). Thanks!
