This video shows getting into the system diagnostic menu. I haven't done it yet, but here is the way to access it according to the video.

1. Turn on car.
2. Turn off radio
3. Hold menu button while turning volume **** clockwise.

From the menus it looked like there might be some cool things to access.

Has anyone played around in here? If so, any cool tricks?

 

Other than turning off the noise cancellation (if you want to) not really that I've found.