While the implementation of synchronization is not obvious, the concept of doing it is. They shouldn't be able to patent the entire concept of allowing multiple

While the implementation of synchronization is not obvious, the concept of doing it is. They shouldn't be able to patent the entire concept of allowing multiple speaker volumes to be adjusted with a single slider (which is what everyone is complaining about), as the implementation of that is trivial. Maybe that isn't what they've actually done though...maybe Google is keeping their synchronization stuff, but breaking the volume change since Sonos made the mistake of combining them in a single claim. That way Google can avoid violating that claim by not doing the volume part.