We don't use Receivers for Zone-2, so that is not a problem. Is there a discrete code for volume level. When we were doing Denon, I could send a discrete code that would turn the volume to about halfway for the Sonos Input. Then I could send a command that would send volume back down when changing to the Cable Input. This was a nice feature because it easily allow my clients to use the Sonos controller for volume.

Adam, have you had any units go bad? I really like the 5-year warranty.