So far I'm only aware of VallyBell's vgmplay, Chocolate Doom, and a specific patch one can apply to the DosBOX source code to use direct hardware I\O to a OPL3 chip equipped soundcard.

Anyone else have any recommendations/suggestions to what else I can try my CMI8738 against? I'm running x86_64 Linux, and I'm fine with giving binaries the CAP_SYS_RAWIO providing they don't go haywire and destroy the whole system.

ALSA MIDI support also works but with bugs that probably went unnoticed since the early days of ALSA. Namely certain controller events are ignored until another "voice" is played after the fact. (Volume being one such problem)

Would be amazing if I can somehow coax a KVM virtual machine to allow guests to talk to the OPL3 part directly.

Another thing I'm wondering but isn't really on topic specifically, why is the CMI's OPL so quiet? I have the volume turned up as high as it can go and some things are just way quieter than the PCM output.