(adsbygoogle = window.adsbygoogle || []).push({}); I have an HD PVR and I've seen so many videos where I could hear the recorder's voice as well as others too.

Edit: Don't say it's not possible... cuz it is. And I am NOT talking about commentary. I've seen gameplay where it shows the recorders mic symbol in the game.

You mean like live commentary? or like after gameplay has been done

After they record they tape themselves while watching the game thats how they can make commentary.

use audacity and get sony vegas/ windows movie maker and put them togather

Ok, so while you record, you need a mic plugged into your computer. Once you record both at the same time, you try your best to sync them together even in Vegas or Movie Maker..