weird issue munging music in bf1 mod tools.

[wsa30h]

when i munge my custom sound with music in bf1 mod tools  the music munges but doesent work ingame but everything else works. when i munge in bf2 mod tools using marvel4s fixed souns mungers music works but one of the faction sounds for weapons and voices dont work. does anyone know if music for bf1 is supposed to have a specific format or bitrate ? also does anyone know why one of the factions would stop working suddenly ? bot factions work when the music is done into a seperate lvl andmunged in bf2 mod tools and then called upon in the lua after the main sound file. does anyone know why this happens ?