An ArenaNet person has already admitted that some NPC audio loops need to be taken care of and I know that some already has happened in that regard (thank you, standing at the Hoelbrak TP now is a lot more comfortable).
However you might have overlooked the Tamini at some stage.
I’m okay with them being a rather vocal race but have you ever done the event “Hold Heatwood Pass camp”? A dozen Tamini shouting their insults at the same time becomes a very upsetting cacophony.