Long, long ago, there was an option in the sound settings to switch the sound source from your character to the camera. This was very useful for a number of reasons. For one, if your character stands next to something emitting sound like a brazier or something, if you pan the camera to the front you would hear it from the left since it's from the camera's perspective, rather than your character's right.
After a while, this option disappeared. I think it was some time during TBC or early WotLK. When Blizzard was queried on why, it was apparently because very few people used it (kind of a stupid reason for such a simple feature), but you could still enable it via editing the config.wtf manually. And that's exactly what I did. And all was well. Until the 4.0 pre-Cataclysm patch hit, and I was suddenly experiencing severe sound bugs until I tried turning the feature off.
I'm assuming since Blizzard officially abandoned the option, it's still bugged. Though I suppose it doesn't hurt to ask if someone has found a way to make it work still. Can't even find the name of the text line I'm supposed to add anymore.