Did you find a solution, similar issue with AV5 and Oveture

link

I try to link a Beocenter 2 to a Beocenter AV5 via Masterlink. I have additional speakers connected to the Beocenter 2. What is the correct option setting for the Beocenter 2 and the Beocenter AV5? Normally it would be 1 each, but this results in both CD players turning on when pressing CD. Therefore, Beocenter AV5 in option 2 and Beocenter 2 in option 0 or option 5 seems right. However, using the AV button to transfer sound from one source to the other doesn’t work properly then. Any ideas how I can get that configuration to work properly, if any such configuration exists?

I can't find any manual describing this scenario, neither any description of how option settings works for a Beocenter AV5. I have a Beocenter 6, 22 with Built in radio myself and have tried to see how that react to different option settings, so my answer is based on that, and things might work differently  on a Beocenter AV5. On the Beocenter 6, 22" the video option settings seems to have effect for both the video sources and the radio source. If it set it to option 1 (or 5) I can only control the video sources when controlled locally If I set it to option 2 (or 6) I can control both the video sources and the radio source when controlled locally If I connect a link speaker I can only control the sources from that if the TV is in option 1 or 2. Based on that I think that the Beocenter wil work as both and audio and video master at the same time when in option 1 or 2.   So to solve your issue I guess that you have to setup either the Beocenter AV5 or the Beocenter 2 as a link room in order to avoid conflict with two audio masters in the same system. For example you can set the Beocenter AV5 in option 6 and the Beocenter 2 in option 0. That way you can control the sources on the Beocenter AV5 with normal commands, and the sources on the Beocenter 2 with Link + source commands. Downside is yo do not get sound out of the speakers connected to the Beocenter 2, and you can not distribute sources from the AV5 to other link rooms. An other possibility is to set the Beocenter AV5 in option 2, and the Beocenter 2 in option 4, and no masterlink between them. That way you can control the sources on the Beocenter AV5 with normal commands, and the sources on the Beocenter 2 with Link + source commands. Downside is that one system is not linked to the masterlink network. Hope this helps figuring out a way to use the system.