Well, it should be possible to make a PSF set from the game but it'd require someone more skilled at it than me, as quick import of the ripped datas into davironica EZPSF driver doesn't output sound.
But yeah, the game uses standard SEQ/VAB driver, I've succesfully converted the ripped SEQ files to MIDI and they play fine (albeit with wrong instruments for obvious reasons).
//Edit
RB, the part in the yuno that starts playing at roughly 17 seconds in does sound a bit out of tune (both in in_ssf and in the MP3 sample you provided). At least compared to the PC-98 original, maybe the Saturn conversion is borked. Compare yourself.
www.snesmusic.org/hoot/yuno.ogg