Neat hack instrument from Jeri (ok a year or two old now). I happened to not have seen it before so new to me and thought I'd share the old news ;-) Not sure if it could be done with the actual c64 itself (this looks like custom circuitry on the sid just mounted inside a c64 case). Still.. I'm surprised I haven't seen this whipped out at any of those retro music/chiptune tribute bands.