Okay, I found this program on NGEmu yesterday. PSound extracts only sound files from PSX games. Sound files by which I mean sound effects, speech files, and INSTRUMENTS. I've tried with FF7, FF9, and FFX (demo). The full retail FFX files are hidden. The demo's ffxdemo.img is not ^_^
FF7: Sound effects, instruments
FF9: Sound effects, instruments
FFX: Sound effedts, instruments, speech files.
Yes, instruments on FFX! Still living in the past. I guess Square new someone would eventually crack open their precious game. By my reckoning there are about 2000 instrument files, some with one file per octave, to one file per instrument. But actually, the notes that the game only uses are there, there is no real time pitch change. These are not actually instruments, but samples. Some of the files are actually riffs (Like in the song "Peril/Crisis").
Yes instruments on FF9 too. However, not as many as FFX though. At first I thought I could create a FFX SoundFont, but now I'm changing my mind to maybe an FF9 one.
Too bad Sephiroth19992000AD(?) alreayd made a FF7 SoundFont otherwise I would have done one.