For years I have been slowly building up a multi-zone audio system in my home. The first system I had was based off of my Yamaha AV receiver that had a second zone output, to which I used to feed speakers in my garage. Later on I expanded that to also feed audio into my kitchen/living room area, but was still only based off of two audio sources so the garage and living room still only played the same audio. In those early days I really only had three audio …