What’s this icon in the music settings?

[NSCyber]

What’s this icon on the right? it’s always grayed out, even in park and I can’t figure out what it does?

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[llllIIlIIlIlIllII]

It resembles the "control the back screen" icon.

 

[Pops]

Its so you can adjust the volume of the rear screen when it has audio.

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