I think the Client was the EU Client. ( Hubi uploaded) It is the same all Private Servers which u play with the EU Client dont have sound. So i think if Hubi would upload only the patch and everyone would extract it into US Client the sounds would work fine.
Bcause everything is set to our pc so if there are a view files on an other place and not in the cabal folder they connecting in the Pc works not right this could be the reason and i know that prob too and when we'll upload a patch and put this into a new cabal folder then it works , i know it bcause i testet it