The music is visible as XA?
Because there's f*** LBA system
for files, every song read a position 2 position.
So there's pointers,
and with files the XA needs to have the same size or recalculate pointers (no idea)
Needs to know romhacking to modify file system.
I remember swap discs with psx.
And that happens.
Tony hawk 3, swap to tony hawk 2,
play tracks selection, I heard "parts" of the second game (from x position to y, because want to reproduce the TH3 start-end tracks by position, but in TH2 the tracks lba is other)
Same happens with Cdda.
Mortal kombat trilogy music in Rayman. Lol
Sometimes the games made weird things, FF6 in overworld without
battles, works like a trick.