I have been ravenously going over all the MidiboxSID documents, tutorials, postings, etc. I will defiantely be building one in the somewhat near future. I'm starting to get my head around the concepts (after weeks of reading the same stuff over and over), and I am even going to be taking a basic electronics class this semester to develop some skills before I start. I have a couple of questions... First of all, my idea for my eventual MidiboxSID is 4 sids, 2*8580 for one voice stereo left/right, and 2*6581 for the second voice left/right. Does that sound fesable? Also... 1. I know that you can salvage to PSU from the C64 for the synth. Will the PSU from both the C64 or C128 both work? Is one preferred (especially considering I plan on having both types of chips onboard)? 2. For the way I outlined the setup for my unit, would I trick the unit by making each pair share a device id, so that they act EXACTLY the same? (IE, both 8580 cores have to same device id, because I want it to act like 1 stereo voice.) Or is there a better way, or a reason not to do that? (please forgive me if I'm overlooking a major design concept of some kind. I'm still learning! :)) 3. Are there other parts that can be salvaged form the PCB of the C64 or C128? Resistors, etc... 4. What's the sound variance on SID chips? Like if I had two SIDs, same model, same parameters, would they both sound pretty much EXCATLY the same?, or would the sound vary noticeably? (also for the stereo thing) 5. I notice the POTX and POTY connections on the SID. I know they're for potentiomenters, but what do they do to the sound, if anything? There was more, but I don't remember right now. Thanks!