Alright, so far all attempts by me to modify the program with files not created within the game have failed. Music seems to be one of them.
However, I noticed that all of the FH music had 80kbps quality. I tried files with quality higher (128kbps) and lower (50kbps) and neither worked. Which got me wondering, do music files have to be exactly 80kbps, or is it a matter of matching the maps to the music (though both of them were .mp3 files, and if they are renamed to exactly the same name and have the same quality I would assume that the program should not be able to make out a difference, right?)
Anyway, any help on this matter would be appreciated.