Somebody else already outlined something similar but I found my problem to be a little different. When I open party chat in the beta there was a constant high pitch buzzing noise that would not stop. It was only the combination of Destiny Beta+ Party Chat. The chat voices were crystal clear but as soon as I unsnapped the chat our party could no longer hear each other. Using in-game chat was the only solution we found however the chat was lower quality this way, and just seemed all together worse i.e overly loud, a little crackly etc.