Meh, I'm one of those that always felt the instruments used in the game were pretty crap even on its original release. The entire OST really lacks any kind of low end throughout the entire thing which has always bugged me. It's got great memorable songs, but I usually prefer to hear them rendered by something other than the original instruments. I wouldn't mind modding in the versions played on the Yamaha DB50XG, you can hear them in this playlist here:
http://www.youtube.com/playlist?list=PL55731C2A92FBB4EE
Obviously, this is just the Yamaha playing back the midi files from the original PC release, and as a result it loses some reverb effects and the vocals from One-Winged Angel, but one can always mod in the PS1 version I suppose rather than a re-rendered version with superior samples.