If you use the multi room input on the marantz rcvr there should not be an issue with the timing. I would install an IR. receiver to the router then zone 1 output of the router to the 794-50. The 794-50 will connect to the multi room in on the Marantz The IR. receiver will receive the Xantech code then convert them to the marantz codes and feed them to the 794-50. The front panel of your Marantz will not recognize the Xantech code's