The game will sound a message when you get a tell, but you'll only hear it if you're actually in game....meaning you have the game window focused. If you're alt-tabbed and watching a movie or looking something up on the internet....you won't hear the sound. I believe what the OP is asking for is a plugin that will watch your chat log, then when you get a tell, have RebornBuddy play a .wav file. That way it'll play the sound regardless of whether or not you are in game.