I desperately need some guidance with this research because I'm at my wit's end.
I simply need a tangible remote control—not an iPad or phone—that I can use to adjust the level on a selection of Sonos speakers or on ALL of them.
No more Tradfri gateways are available, so you'll have to wait till their new hub is ready, however it looks like their Tradfri remote may manage a number of devices (or all speakers). I have the remote but no hub yet.
pico remote and lutron hub just went down this rabbit hole and there is no Sonos "group" support; you can only operate ONE speaker at a time.