I got the musicnew wavebank recompiled and after a bit of fiddling (you have to make sure the version and headerversion dwords match) got it to work ingame.
Unfortunately, although internally the names were the same, the order in the wavebank must be important because the wrong tracks played at the wrong times and imuse got very confused.
With a bit more tweaking though I should be able to give you all a working project workflow for replacing the music
