The cause of this is a new feature added called Alert Fade
All you have to do to 'fix' it (i.e. make it go back to what it was before) is go
Menu > Options > Sound > Alert Fade to 100%
and it'll be normal
yep, u're right. But I have no idea why Blizzard do that? They could have implemented that feature, but set the value up to 100%, so someone who want to change can change it, not forcing ppl to change it like that...
And about the fps drop, some got problem with razer gears that have apm lighting.., however I only use a Razer Death Adder (Light turned off already).
I think it's gonna be a problem with Mac OSX Version. Found another thread: http://eu.battle.net/sc2/en/forum/topic/2690611989
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