Description
This addon has been broken by Midnight's new API limitations and is now abandoned.
HBlyx has released an addon with as much functionality as allowed here:
https://www.curseforge.com/wow/addons/focusinteruptsound-midnight
Update: HBlyx has added target-interrupt functionality so it is a great replacement.
In late February, I will likely have an unofficial patch to HBlyx's addon for people who want the target-interrupt functionality (which HBlyx doesn't want to add).
Makes a sound when your current target (or focus**) starts casting. To configure settings type '/fis' (or go to Interface Options). Also has basic functionality to announce successful interrupts.
** Use with [target=focus] macros for interrupts (Counterspell, Spell Lock, Wind Shear, ...).