Ok I have a legit copy of Windows Vista Home Premium and when for example I will be playing COD4 or CSS it will seem alot quieter so I will alt+tab and check my sound mixer to find that the games + vent or mumble to be turned down in the mixer.

Does any body have a fix for this?

*I have posted this thread before but the problem wasn't fixed and for some reason I don't have a communications tab in playback devices

Edit;

some people are saying it's because of mumble but they don't know what the setting is called to stop it from happening, if you know please post.

Edited once, 20/9/11 - 7:39pm.

Is it just quieter or is it also not playing out of both ears equally?

Whenever I play BC2 I have to go to my audio manager and just change the audio frequency and it fixes it.
But nonetheless it is still annoying.

mumble makes ur sound low when u talk... does anyone know how to fix that ?

It just gets quieter and it stays down

simple fix, just untick the highlighted boxes.