Hi...i am anew user here. As per my case i have been going through the PIC18F code but like you, see the STM32F4 as the future. Seeing a working example would help a great deal to get me started on the platform. I know I'll have to write a new HW driver and adapt some/lot of the synth engine, but the YM2612 seems like a sub set of the OPL in a lot of ways.
pcb assy