I just got NightElf to Undead attack sounds to work, and I did it the same way your talking about except I used the PlayerExertions directory. I exported the Sound/Character/PlayerExertions/UndeadMaleFinal and renamed all the files from UndeadMalexxx.wav to NightElfMalexxx.wav and put them into a new .mpq and set up the directories the same way, Sound/Character/PlayerExertions/NightElfMaleFinal and it worked just fine.
The regular grunts/moans during combat change, but the voice overs don't, the one's that say 'out of range' or 'not enough mana/rage'. I looked all over that Sound directory in common.mpq and couldn't find anything that even remotely looked like they were the files for those sounds. If any of the pro's know how to change the voice over sounds and not just the attack sounds, please let me know.
