Audio updates??

[Gnnag]

Hi there, I am new to the whole mod thing so please ingore my newb stank for as long as you can. I have a quick question concerning modding the audio content of the game. Namely the zone and combat tunes. I have ample tracks that I would love to replace the exsisting tracks with but have failed consistently.

Are there prefered file types?
How do you swap the files out? I have deleted the originals and replaced them with identically named replacements but the patcher still replaces them.

Any advice you can give will be appreciated even a "hey use this link dummy" reply will be greatly valued.

Thanks in advance.