I cannot test the current behaviour in 3.0 but I'm currently working with an Ion Xe and a Gio @5 running on 2.8.2 where the Ion is the master, and is in a control area at the back of the gods while I've got the @5 in the stalls. It would be really handy if the Searching for master console.. - Troubleshoot screen included an option to power on multi-console.
tt2
