Aside from the Sidstation or DIY SID/SID-like projects: If you have a C64 and a MIDI interface for it, the Midislave software makes the SID chip inside MIDI-controllable. Fun, funky, free (just send feedback, cool noises, whatever to the author). Should be in the vicinity of: http://www.df.lth.se/~triad/triad/3phile.html :-) Kevin