I attempted to make my own before - but in a hacky style of way - by just playing the game and recording the sound using Total Recorder, and then very carefully edit the subsequent wavs afterwards and add fade outs at the end etc. But I'm sure it would sound a lot better if done supposedly the proper way - recording from a real MT-32 - but unfortunately I don't have the appropriate hardware (MT-32, complex recording equipment etc). I did wonder why nobody at the Scumm Bar thought of this already, to be honest? The floppy soundtrack sounds dead great through it, that's for sure!
