Thanks for the suggestions. Checking them out right now. I like how all these different formats have their own, peculiar tone.
DSM has a strangely syncopated, futuristic and atonal sound, like some 8-bit Meshuggah.
BKM/TAS can be really friggin' ominous with their lower tones. Pretty minimal.
FM2 uses higher tones, and can sound a little more stripped down than the other formats. But there are exceptions to this too. Sometimes the listener is bombarded with minimal, syncopated rhythms as in DSM-files as well.
PJM have a strange bouncyness to them, like a frog jumping (incidentally, the frogger run sounds like this). Or they might sound quite close to FM2 files. Darkkobold's FFVIII movie is pretty cool, like some high-pitched, rhythmic synth sound, could be a minimalist techno piece in itself.
I happened to notice that old OpenMPT can really open any sorts of files with luck, but the results sound quite glitched and the files don't run so well. These text-based movie files in their clean, repetitive format are better for this purpose.
EDIT:
Uploaded some examples on Youtube.
TAS music #1: randil-clashatdemonhead.fm2
TAS music #2: goofydylan8-nightmareonelmstreet.fm2
TAS music #3: hellagels,red-crowned-crane-megamandxadventj-100p.dsm