This is a curious question I have. I know the Roland MT-32 and SC-55 are not working in MAME right now, they don't actually emulate the sound. But at such time as the emulation is more mature, how would the machines be used for MIDI on an emulated PC or X68000 or any other computer that supported them? The synthesizer would need to handle MIDI while the computer would handle sound effects; and you'd need to be able to operate the emulated synthesizer simultaneously with the PC (did the Roland devices have their own independent volume control?).
Considering that MT-32 and SC-55 are separate machines and not just devices, is there yet there any way in MAME to run two machines at once, or to have them communicate with each other? Or would they need to be converted into devices for use in conjunction with another machine? I know that the ability to actually do this in MAME is probably far off, but has anybody given thought to how it might be done? This is just something I was thinking of randomly this morning...