I have a Beam gen 2 and 2 One speakers. I used to configure them as a surround system, Beam connected to my TV via HDMI ARC.
Then I found the two Ones are mostly idle as I don't play enough surround-sound content. So I recently removed the surround setup, and grouped the speakers, hoping to listen to the same sounds from different speakers, immersive in a different way. I found a way in the Sonos app to configure the TV output to all speakers there, which is great.
The problem is when I change the volume on my AppleTV remote control, only the volume of the Beam got changed, Ones' volume stay the same unless I use the touch buttons on the speakers or use the app. Is there any way to sync the volume control across all speakers?