Thank you both, works! (Master has to be in stand-by as usual...)
I had set the option before through a BL1000 but was curious about the BL7000' ability to do this.
Stepping through all the options I already found the Panel setup but that looked like the audio master's 1 / 2-way setting by learning from the master. 2-way was working already but option 0 / 1 / 2 had to be set.
Option setting works here even in 2-way mode.
Being hardware / software engineer & not finding this makes me a bit embarrassed
Best regards,
Gunther