The concern I have is upsteam of the 990 - those two source players' outputs will be joined by a single, uninterrupted conductive pathway that is bridged just before the splitter reaches the 990. I simply don't know what the ramifications of that might be for those two sources. If we were dealing with air or water, I'd know what to do - and I'd look at a backdraft damper or check valve because I would not want flow in the wrong direction. In this case, though, all I have is some anxiety about it. I'd talk to Outlaw support or some other manufacturer before hooking my gear up that way - my concerns may be unfounded...