thank you. So as far as I understand, its just a matter of different filter caps and regulators on the SID modules per which sid chip i use. Then using the PSU C64 schemo's and it will all work fine on the SID module cause they have the regulators and on the CORE module side cause the PSU has 5volts (?) or regulators? Then, on the software side, I just have to edit a line of sysex to tell the module what SID chip its running and how to use it correctly. ? Is that everything? Thanks so much.