Readiness hooks into the blizzard ready check in order to play a custom sound when a ready check is performed.
This is not meant to be a fix for the temporary loss of the ready check sound, it is meant to completely replace it. It's not necessary to have this installed for everyone in the raid as it hooks into the blizzard lua so ready check communication remains unchanged.
To add a custom sound:
1) place the .ogg or .mp3 file in the Sounds folder
2) Open Readiness.lua and add a new line under soundList, being sure to maintain formatting used in the existing 15 lines