[BUG] Game sound

No one else seems to be pointing this issue out, but here was a thread about this in the General Forum , and I haven't seen any confirmation that Blizzard they are looking into this, so I'm posting it here.

SInce I got into the Beta two weeks ago, the game sound has not been working properly for me. I will outline some of these issues below:

Some things I can't hear:
- Mob death noises
- Combat noises, e.g. gun shots, weapon swings, grunts when hit and some abilities e.g. stealth
- PC laughter (/lol)
- NPC voices

Some things I can hear (sometimes delayed by up to several minutes):
- Quest accept/complete sound
- "Rustling" noise when opening a tab
- PC emotes (all except laughter)
- Level up/achievements

As I said, no one else seems to be saying anything about this, so I am beginning to wonder if it is only me - despite the fact other people pointed it out in the other thread.

General Forums Thread: http://forums.worldofwarcraft.com/thread.html?topicId=26262990003&postId=262602777982&sid=2000

P.S. I play on a PC.