I am setting up a system with an XP-8 and four Denon Receivers all connected via RS 232. When a receiver has been on and left idle (no volume change for 30-45min) while watching something and I go to change the volume via the T2C it takes a good 5 seconds before it registers the volume command. Is this the Denon going idle or the XP-8 going idle? After the initial delay it is responsive until it sits "idle" again and then the delay on volume commands.