I'm aware this thread is quite old but I am currently trying to do exactly what is described in the tutorial, albeit approaching from a different angle. I really dislike the standard battle music and either wanted to replace it with another music file from the game or somehow stop it.
What i have tried is replacing:
2371.out between_life_and_death.mseq
2372.out between_life_and_death.minst
2277.out between_life_and_death-variation.mseq
2278.out between_life_and_death-variation.minst
With another mseq and minst. This doesn't have the desired effect though (normal battle music is still the same). The files list on the modifications page hints that some sound files may be embedded inside the battlefield files themselves, wondering if anyone has ever attempted this?
Is the simplest way just to hex edit the battle flags as is done in the video?