I am witnessing some recalcitrant behavior with Sonos’s Multi-Room operation. I invoke the multi-room command and sound output is oftentimes only present in the original room. I use the room volume slider to control the impacted room(s) and sometimes it works but rather delayed and other times it doesn’t function at all. I have created “Quick Actions” to invoke two discrete actions…Living Rm/Family Rm Audio and Living Rm/family Rm/Patio. These two separate Quick Actioins are rendered through/via a Denon AVR-X8500H utilizing the Multi-Zone Driver. Incidentally, Denon’s own HEOS Platform works flawlessly in every instance. A Vote for Denon HEOS Integration.