Thank you. I will try this. Though I'm not sure I can set the Sony Bravia TV for audio passthrough. Not sure how to do that. I have looked at all the audio settings on the TV that I can find and I don't see anything specifically called audio passthrough - so I'm not sure what I'm looking for on that front.
Not sure if this matters. The Apple TV is supposed to be plugged into the HDMI ARC input. So is the Sonos. There is only one of these on the Sony so I plugged the Sonos into the ARC and plugged they Apple TV into a regular HDMI input. I'm hoping the Sony passes through the ARC audio hookup.
Sound quality is decidedly better on both Apple TV and the Sony's native android option, but neither sounds quite as good as I'd hoped. And, oddly, I have to turn the sound up far more than I do without the soundbar. Audio from the android tv is Stereo PCM 2.0. I don't think this Bravia has Dolby Atmos (too old).
I get no sound level indicator on the Apple TV now. Not a big deal. Just annoying and puzzling. Thanks so much for responding.