Notes: *If the App doesn't work properly, please try to reboot your mobile device, unplug the power cord of the main unit and reinsert into the power outlet or check your home network. *Please use a latest firmware in your Marantz models by checking it via the system setup menu. (General > Firmware) *Please set "Network Standby / IP Control / Network / Network Control" to "On / Always On" in your Marantz product’s menu to use this app.