Solved - it was the power supply, and presumably a repeated rebooting of the PICs due to undervoltage. Got a new C64 PSU and everything worked fine - flashed MIOS and then the SID application… Thanks for the help everyone.
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Nice.
I tested the PSUs now in case of noise ratio. I can NOT recommend this cheap China PSU it makes a really loud high noise output but the JAZ PSU doesn’t do this, it’s pretty damn good, I couldn’t recognize that the MbSID is powered with earplugs, just after sending some midi note.
Next I will test the power consumption with 1Core LCD and CS stuff, a slave Core and 4 SIDs.