I'll probably make the music myself as I quite enjoy audio. It's a rough start, but you can see the initial work I've done regarding a converter here (and obviously it will need a human touch and channel reduction!)
Viewing post in Aonic: The Green Hill Zone Demo comments
I seem to recall it functions something like the wave offset command (9xx) but with short loops, also it has a simple FM synth built in if being able to model a sound from within the editor is desired... And the replayer code is part of the archive I think. I know it can save executable code that you just call from within your code as I have done so.