I have two C64 keyboards at home, and really need only one. The Siel CMK 49 and the Microsound 64 can turn your C64 into a polyphonic synthesizer without any work, just load the software and start playing. Manipulate the SID chip without soldering or pragramming. For sale or perhaps a swap: MidiBoxSid for one of my keyboards? ???
Mail for pictures & more info.