I may assume that Multiroom feature to be major milestone introduced in Volumio3.
But my system, as might be for most users, only complies of a Single Device. But then, when opening Volumio through Android App… it always pop-up the user to select a Device, even so… if there is “only 1” (that is… an annoyance and/or distress).
Suggestion is that if not more than one Device detected, or originally selected, that the Device pop-up on App does not show. Or… another option, a turn-on/off switch for the user to address the use of Multiroom… or not.
Please, understand that this is affecting MOST Volumio users (not many may use Multiroom).
As I mentioned before, and per others (Joni Salminen) acknowledgement… be “technically Automatic” might be the ideal… but we are not looking for the “ideal” here. Just an User “switch” in Settings for Multiroom, or not, might be suffice.
Again, I acknowledge and honor your work, but this “annoyance” (sorry), is affecting MOST of us… regular Users. And I do believe, to have an honest solution…