Sound quietens when I launch gmod

Well, this happens to me and the people I play with, dunno if anyone else has noticed it, but whenever I launch gmod it makes the sounds in the background quieter - people on ventrilo/mumble are much quieter than before. If I change snd_surround_sound it fixes it until I restart or until I join a server. Is there any workaround/fix to this?

Tried search but it’s not working atm

Core i5 750
Patriot Viper 6gb 1600Mhz RAM
Radeon HD5850
Windows 7 Ultimate

Disable the option in Windows 7 to “Dim sounds when communication channels are detected”

Cheers, fixed.

Had same problem, thanks. :smiley: