http://bugs.winehq.org/show_bug.cgi?id=35587
--- Comment #29 from Riccardo c10ud.dev@gmail.com --- (In reply to bugzilla from comment #28)
(In reply to Riccardo from comment #25)
Fixed by Riot in Beta client, hopefully next patch will contain this fix!
It appears the fix for this is part of a rewrite of the entire audio system in LoL. It's still in development, and is occasionally added to the beta client for a short time for testing, but won't be pushed to the live client for a while.
It's fixed with the new audio system (Wwise) but for a brief time, it was fixed with FMOD too.. now it's broken again.
Here's a link to the upstream bug.
http://community.pbe.leagueoflegends.com/en/c/bugs/12eEfQsI-fmod-systemsetfi...