Not sure if anybody out there is making chip music with their c64, but I just installed the sid2sid mod(enabling 6 channels or stereo using two SID chips) which requires you to solder a cable on the 7th pin of the expansion slot. So far my chameleon has still been working even with two SID chips! So that's good news for some people out there.
Also, most games I have tried in either .d64 or .prg format have been working (so far about 9/10 I have tried). I can only recommend it so far, and that's while it's only in beta status!