It simply applies some of the tracks from FF9 to FF8. It came about largely as something to do for fun, since I had recently installed a copy of DirectMusic Producer, and I wanted to see what it could do.
True, a majority of the songs do not sound like the OST. Notation-wise they should be more or less exact (except for the FF9 boss theme, because of the way the drums are set up. I've fixed a majority of those problems now, but they won't be available until the next release of the mod.). Instrument sample-wise, no they are not exact. But that's because we don't have any good FF9 instrument samples. I've also had some difficulty with the strings and saw wave sections of the FF9 battle theme, I can't exactly get the volume balanced yet. All the string notes toward the end of the song are there, it's just that they're being played at a lower volume I had needed for the beginning of the song.
Hmm.....perhaps I should include a disclaimer that says that the mod uses FF8 instruments, and not FF9's so there will be some differences. But, I suppose that same fact does make it mesh a little better with the rest of the FF8 soundtrack.