Samsung TV Binding Volume with ARC


I have two Samsung TVs (don’t think the models matter). Both are integrated in OH using the Samsung TV binding. OH 3.1, but the issue was already in OH 2.5.
When the audio output is done by the integrated speakers, I can change it using the channel :volume. All works fine.
But when I connect an ARC (audio return channel) speaker (Sonos Beam in this case), the :volume setting is without any function. I understand that this might be “a different setting”. But how can I control it?

Hope you understand what I mean :slight_smile:
Happy for any help.