[Itamar]

Well , first of all remove all pk3's which says anything about sound.. like
Fubah's_Sound.pk3 for example..

Things like that.. if you haven't installed a sound mod , then you should have no problem , just insert my pk3 file to the folder of MOHAA\Main

If you still can't find anyfiles that seems like sound mods , then see what you installed , I mean the creator of the mod , then you can go and open the zip which you downloaded and see what is the name of the pk3 file...

Itamar.