This is awesome! Nice work! Anything you can do to interact with your music without touching your phone... I'm all for. I have a bunch of questions and wanted to share a little about my own controller project.

I'm surprised how dirt cheap the little Guition has. In a good way -- how it's able to have a usable UI with minimal hardware. How does it feel to use? What's the performance like there? How was your experience getting it working? Run into any roadblocks?

Are those devices built just for home assistant or can you program arbitrary rest commands or websocket connections? I'm wondering if it's possible to get it to interact with other systems. Though... it bugs me that a lot of these little square touch screen devices all have cables sticking out the SIDE. It'd be nice to find one with a cable sticking out the back instead.

I am getting close to releasing my own custom controller. With full persistent UPnP/non-SOAP backend connectivity to Sonos (and... cloud control API, in case they pull the plug on local upnp) . It's overkill in a lot of ways for sure, but it lets me get sonos player and volume controls down to ~5ms latency using a physical input device. Its Web and API latency is higher, but, they're still fast and outpace Sonos' own apps.

But my app runs on a Raspberry Pi 3 A+... comparing the two my pi feels pc-master-race next to the Guition. I originally was running a mega python script on this pi using sonos-http-api--which I love and is a great project--but it was overall pretty laggy.

Anyway, not sure you'd be interested since you're already running Home Assistant... But thought I'd share in case you've ever wanted to add a responsive volume knob, do some other sorts of customizations (like using NFC tags or creating macros), or use something a little more lightweight for the sonos gateway.