I hate helping people who have broomsticks up thier cavity, but today I feel nice.
Use Google - ill [help] This might be Classic might be retail (Link Classic) .
Link saying 8.2 messed with sound files
The stuff searched was from a month ago, type in Google “mute succubus sounds in WOW” and you’ll be amazed, try everything, if it dont work then you havent searched enough and we cant answer you here anyway, if nothing on Google or and addon cant help, I’d suggest opening a ticket as from what I read on retail ‘they are working on it’