Shows debuffs applied to your Co-Tank without having to put him in focus or anything.
Check out Custom Options tab.
"Sound at x stacks" plays the sound when your Co-Tank reaches the specified amount of stacks. (0 = disabled)
"On Application" plays the sound when the debuff is applied. (usually for debuffs that don't stack)
I suggest installing https://wow.curseforge.com/projects/sharedmedia_causese (not mandatory) else you have to change the default sound.
Let me know if something is missing/needs to be adjusted.
This is not pre-configured for the most part.
Sound is choppy/cutting off, what do?
Disable "Sound Effects" in Escape -> System -> Sound (ingame) and/or follow this guide
tl;dr only a certain amount of sounds can be played at the same time.
Special thanks to Panthea for populating the custom options