INstrument files? The CPS-1 machines have an FM synthesizer. And I believe other versions like the X68000 used MT32 sound canvas or some such shit. Gotta check what the CD version used, but it was probably one of those sound modules and they are already sampled (and in my hard drive).
A lot of rework has to be done anyway because we're talking 8/16 channels against 4 (2 of which will be interrupted by sfx). Gotta take a listen to the full original soundtrack and the CD one and see what's up.
Another "deluxe" option is that for those with a MIDI interface to actually use an FM synth to listen to the audio.