Using FMDrive VST to control the YM2612 hardware in realtime
Using SSG envelope type as a "fake" CSM mode vocal type effect.
(fast SSG envelope can sort of emulate the auto key on / off behavior of CSM mode).
Setup in this video is:
FMDrive VST sends MIDI data to the GENMDM MIDI interface that sends register writes to the YM2612 chip in REALTIME.