I think I can convert my MIDI file into a MUS, I’ve found tools to do that.
I’ve also found it uses channel 9 for drums (normally that’s channel 10 in General MIDI). But maybe the converter takes care of that idk.
I’ll have to try to import it into Slade and get it to play in Doom somehow, so I can hear how it sounds for real, especially using Doom’s OPL soundbanks, which I feel is the most common way for people to play music on DOS.
I currently have no idea how to do any of this, but I guess I’ll see how far I’ll get with google.