Big Picture: the MBSID V2 sound engine has been 1:1 replicated and delivers identical results. This has been proven with a virtual prototype (the AU instrument) and with direct connection to hardware (more about this below) The number of engines running in parallel is only limited by available RAM and chip performance. E.g. running 4 engines which service 8 SID chips isn't a big problem, and even on the STM32F1 there was enough headroom t