Ernie,

The wiring is already complete as part of a renovation done a while back. Yes all of the wires for the speakers are home run. The ones that go out to the back yard (gazebo and fire pit) are accessible and could have local volume controls out at those areas which I will do if I go the 70v route as has been suggested. The wires for the courtyard and hot tub areas could accommodate a local volume control with some difficulty. Each home run to those areas is accessible from the attic, prior to dropping into the exterior walls/soffits.

Whether I use multiple Sonos Connects or the Casatunes system, I can control volumes in these areas using the associated control apps so I think I'm OK in that regard for now.

Thanks very much for the suggestion.

Craig