cooldown noise

[xylocane]

Ok so, when attack with cooldown is used a small button for them appears just above the main action bars. They have a small counter in them to show when attack will be cooled down. At the end of that countdown a dinging type noise is made for each one.... How do I turn that noise off. It is so irritating I may have to stop using nUI!
thanks for any help you all might have