Ah OK, you are using the 11 rack as a sound card, then this may be a windows issue not 11 Rack. You may need to let windows know that you are using the line in on the 11 rack as the mic input. this may help:

http://superuser.com/questions/595494/ho...-microphones-in

You may also have to set the game to use the 11 rack as the sound card.

Overall, it may be way easier to switch to the onboard sound of the PC when you playing games (i.e. plug headset into the PC vs 11 Rack) and adjust the settings in windows accordingly.
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I'm a practicing guitarist, one day I hope to get it right..