First of all your going to have to call a Crestron dealer in your area. You are probably missing the processor which the touch panel in the wall is tied into. It runs off the cresnet bus from the processor and is also where the power comes from. Your audio source ties into a switcher of some sort which is also connected to the processor. Look in the equipment rack, closet, shelf or what ever they left and look to see if you have any of these