Chatterbox supports English, French, German, Italian, Portuguese, and Spanish interfaces
Play special sounds when different chat events happen
Sounds can be limited by sender so you are not overwhelmed
Channels can be disabled, or use internal or even custom external (OGG) files
New sound "picker" makes using built-in WoW sounds easy
Open channels (Says, Whispers, and Yells) can be limited to Friends and NPCs, etc.
Each "channel" can have a dedicated sound