As for the other question here’s what i did in 3 minutes;
If you have read the info on ucapps.de (please do this good; there are people who built complete midiboxes only with the info given there) concerning the midiboxsidsynth; you will notice that the only parts you need from the commodore are the SID sound ic (SID6581 or SID8580) and (optionally) the commodore power supply.
Go to google or something similar!! and search for;
“commodore 128” SID
on the first page there is this text;
For sound, the familiar SID 6581 microchip is used (version 2 or 3 depending on the machine). Commodore engineers included SID and VIC-II compatibility to allow existing Commodore 64 users to upgrade to the Commodore 128. In both 64 and 128 modes, the VIC-II and SID are accessible from BASIC and Machine Language routines (ML).
easy yeah?
The ucapps site can look a bit overwhelming at first, but the documentation is good and all there, just take your time reading it step by step, and just start building the thing! Like someone said before; the worst thing that can happen is that it doesn’t work the first time, and at that point i’m sure everyone at this forum will be more than willing to help you..