Using an uncut european FNV version the Old World Blues DLC (english) has a big sound problem on my XBox360. Interacting e.g. with a vendor or my companion Veronica you can see them moving their lips but can′t hear their voices! (permanently) You also ant′hear the sound effects in the vendor or repair menu (selling sound, repair sound etc.) I didn′t have the problems with the previous two DLC′s. And besides this you can hear the other sounds normally (music, gun-shots and effects like footsteps, burning fire, and even when the persons around you monologise (e.g.: " That fiend leader shouldn′t have messed with our great army!" and so on). The systems settings are to Language: english / Locale: UK.
I also tried to redownload the Add On from XBoxLive to maybe fix it by doing this, but after 1% downloading it stops and says the download ist complete (that means i can′t overwrite the first download i think).
Any other ideas? For the moment i can use subtitles, but thats not the same as playing with voices.
Thank you in advance.

Now i found out, that you CAN hear the (english) voice if you press the headset heavily into the ears. Then you hear something very silently, but there is no change if you turn up the sound!
Any suggestions?