I could be wrong, but being that he mentioned teamspeak, I believe he may be asking about separating vox and game sounds and being able to choose what goes where..
For instance :
AH player now - All sound through Windows Default Output. All vox through Windows Default Output. All input through Windows Default Input.
AH Player with Teamspeak - All game sounds and vox through speakers. Teamspeak communications through headset. Teamspeak and AH Vox through Microphone.
I would kill to have the option of
AH Game Sounds - Speakers
AH Vox Sounds - Headset
AH Vox Input - Microphone
I lose people speaking on Vox all the time due to my sound being through a stereo.