Kay then, you do what i do.
Listen to iTunes, while doing EVERYTHING.
The only solution i have is...
If your Mic/Headset is USB start up iTunes BEFORE you plug in your headset, and allow the msuic to flow through your speakers.
Then plug in your Headset and start-up Vent.
Viola.
Music through Speakers, Peoples Through Vent.
But if your Headset Isn't USB then......