I'm hoping one day ScummVM AGA will support MT32 
Yep maybe one day I'll find the time to have a look at adding it BUT someone would have to lend me the necessary hardware before I even attempt this.
BTW using the new DosBox MIDI emulator with v1.4.1 of ScummVM it now sounds pretty good on my 1260 at 14bit stereo 22050Hz. I'll do a new video one of these days to show people how good it sounds.
ScummVM sound