AUDIO SUGGESTION

One thing I was able to do is MUTE my cable box itself. It is possible if you have a Comcast/Motorola box to disable the volume lock. Directions: Solved: Control audio on cable box instead of TV - Xfinity Help and Support Forums - 1115959
This will disable your cable box from sending an audio signal while you play your game or watch a movie. The only downside is you will have to use a remote instead of relying solely on kinect commands to mute your cable box but its worth it until there is
a solution to the dual audio issue.

:)

 

My TV will not read my X-Box signal.

Have you gone through the suggestions on the
Audio/Video troubleshooting page?

 

Xbox 360 video connection problem

the reset display should revert the display back to default settings.

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try the suggestions on this page.

support.xbox.com/.../audio-video