I have my TV connected to my Apple TV 4K over HDMI. I've connected my HiFi over a toslink (optical)connection.
Now there is a difference in controlling the volume if I use an Airplay device or the Apple TV itself.
If I play music from my iPhone via Airplay to the Apple TV, I can control the volume via my phone. That is, the volume of my TV-speakers and the HiFi is changed.
If I play music directly on my Apple TV and control the volume over the remote, just the volume of my TV is changed. That is, the TV-speakers are controlled, but the HiFi remains at the set volume. So I cannot change the volume of both speakers. (Additionally I see also the volume bar of the TV)
Can I change the behavior of the remote/Apple TV/Audio, so that it behaves the same as the first case?