Marching Sounds

Curiously, is there a way to change the mod's given marching sounds to user supplied ones? I attempted converting files to .wav and then renaming to the specified version. However, this method didn't work, and "broke" the sound files. A few of the marching sounds are lower quality than I personally like and some regiments (like the 21eme) play the wrong marching sounds (in the 21 case they play the Prussian march). I'd love to hear the guard play the La Marche des Grognards or playing La Victoire est a Nous. It also bothers me that most of the British play the British Grenadiers march. Thanks!

The sound files are defined in sfx.csv. Column B of that file is then used in column N of unitglobal.csv. That defines which marching sound is used by each class of unit. The unit classes are used in column K of the OOBs.

I apparently managed to break the game somehow. I'll keep testing different things to see if eventually I can get it to work. But thank you for the information!