@RonsCompVids this is 7.5.5, I haven't tried 7.1. I first tried on System 6, but couldn't find any plain ol' MIDI players that could run on it, they're all just too new. I got Cubase to run and could play some songs on 6, but the instrument mapping wasn't right.
@polpo I guess the MIDI Manager is part of the OS install, or is it something seperate?