Irelia/Amumu Bug(AURELION SOL BUG???)

When playing Irelia and Amumu in the past 2 days I have noticed a high pitch buzzing sound when hitting the q button, pinging, or when the announcer voice says something. This to mention, also happened only when AURELION SOL was my game. At first I thought it was my computer(my mac work computer), but with while listening to Spotify and Skype the buzzing only occurred within the league window. I, then concerned repaired all league files, twice. The bug stopped for a non-Irelia and Amumu game but then occurred again in my next Irelia top ranked game.Please fix this bug riot, it is very annonying to play with a constant high pitch buzzing every 2 seconds and affects how I play if a high pitch buzz goes through my ears whenever I q a minion as Irelia...

P.S.:Please check my other bug post, there is a even worst bug that occurred in my most recent ranked game..

EDIT(3/28/16): NOW OCCURS IN ALL MY GAMES NO MATTER WHO IS BEING PLAYED.