I had it in mind to see if I could play "Call of Duty - Mw2" with My Screen Recorder and a Logitech headset. MSR does record the video with my voice narrating the action, but the game-generated sounds (which can be heard in the headphone part of the headset) do not get recorded -- except as a very tiny spillover from the headphones to the boom mic.

Is there a way to accept the game audio from the PC while playing the game as described above?