As far as I remember, there was no difference in the PSX and Saturn soundtracks of Megaman X4, but for the longest time there's been a minor thing bugging me. If think it was possible to put the Saturn disk into a standard CD player, you get 2 audio tracks. But what those 2 tracks are, I can't remember. Does anyone else know about this information? The PSX version did not have this trick.

Naturally, this would be followed up with the request for those 2 tracks ... unless they are on the official soundtrack and I just don't know about them.