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Muting stereo while receiving transmissions on a GMRS (0r other) radio?



My car stereo has an "ATT" (mute) button on the steering wheel.  Its an aftermarket (Sony) head unit, so I know there is an adapter connecting the OEM steering wheel controls to this head unit.   

On a recent trip I found myself wondering if there was some good way to patch into this system to be able to mute the music while receiving a broadcast over the radio.   

Most of the time I am using my GMRS radio it is with my 4WD on weekend outings.  We're either cruising to a destination for 4-6 hours, or we're doing trail runs. I like to have music playing (or an audiobook) but if I do, I always miss the first part of a transmission, which is sometimes directed at me (I'm often either nose or tail).

Some poking around found this:


Wondering if anyone has tried something like this?

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