1) Both my army and the enemy play the same tune (which makes no sense)
Yes, its the one big draw back of this mod. Brigadier Graham produced a nation specific version, but it was much more involved to instal and for some reason I could never get it to work.
2) Each unit is playing the fife tune such that it is not synchronised, which means one does not get to hear the tune clearly at all, it's more of a blurry racket of noise
True, although actually more realistic than you would think. Having played in a band there is a problem when more than one band get too close together, and one symptom in real life is that awful shrieking noise created by differently pitched instruments whose notes produce a sort of natural feedback loop against your eardrum. Normally parade organisaers make sure that bands are spaced widely to prevent this sort of effect.