Another way to mute your radio using steering wheel control
 

I know that there is no "mute" button on your steering wheel. But another guy said there is a way to do that. Hold the "mode" button down and it will turn the radio off. I haven't tried it and It will be my first thing to do tomorrow morning

Confirmed this morning. It works.

That's great to learn! The one thing I don't like about the bluetooth in the ET is that it doesn't automatically mute the stereo for an incoming call. This trick will help!