A few years ago, aBus tried to change the industry, and now everybody who ran CAT5 to an aBus location is kicking themselves for not also installing home runs of speaker wire and running it past the control location. I wonder if, some time soon, you might really wish you had designed this system so that it could be controlled in a more simple way, say with physical volume controls out in the yard... Please try to think of other ways of controlling the outdoor volume, and prep for that.