Hello again, well, I thought I'm done and don't need to ask for some help for MBox SID again but I can 't understand whats wrong now and strugglng since a week now. The problem is everything works nice with SwinSIDs but the real SIDs don't work. I've got some C64s and made full function tests with the SIDs and they work, but not with the Core and the SID modules... First I thought it is because of my PSUs (because I guess I did read the SID needs about 5,1 V) and finally connected