I'm done with Google home and the crazy group volume thing. See my follow-up comment : r/googlehome
Google changes speaker group controls following Sonos patent fight - CNET
SONOS
SONOS
Sonos PC app can't individual speaker volumes in a group | Sonos Community
Menu Bar Controller for Sonos
Sonos Release Notes
Google details changes to Speaker Group controls & device setup following Sonos ruling
Feature Request: One Click Volume Match for Groups | Sonos Community
Harmony and Sonos
Google removes group volume control on speakers
Sonos Developer
Sonos CONNECT:AMP ZonePlayer 120 hands-on and Sonos app review - Android Authority
Finally! Permanent groups of multiple rooms. This is the feature I have wanted the most since buying my first Sonos years ago. : r/sonos
Phonos: Sonos App for Windows 8.1, Windows 10 and Windows RT
Sonos volume controls on Windows broken for individual speakers
Sonos group volume button - Configuration - Home Assistant Community
Sonos Developer
Sonos Group Comments - Scripts & Rules - openHAB Community
Menu Bar Controller App for Sonos Speakers Updated for macOS 11 - MacRumors
Sonos Developer
Sonos S2: Home Audio Control Made Simple – SoundVision
Google Home multi-room music setup explained: Nest, Chromecast and more
14.18 Broke Desktop Volume Controller | Sonos Community
