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Let me answer my own question

Got the Apple TV today

Out the box the Siri remote started controlling the tv volume , I'm surprised cause this is an old dlp tv

But I don't use the tv volume I use an old soundbar

I went into settings and learned the vizio soundbar controller

The Siri remote now controls my soundbar
No problems

So if you have an old tv and soundbar , you won't have any problems
 
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