Hello Everyone, We have two Large Group Instruction (LGI) rooms at our building. They each have a Receiver, DVD Player, VCR, and then that connects to the speakers in the room. We'd like to add a wireless mic system to this but have it overlay all the other inputs depending what we have selected. Basically, we want to be able to have the audio come from the DVD Player, VCR, or Computer but still allow the Mic audio to be broadcast over all of this. I don't want our staff to have to be tap dancing between inputs all day. Is there a solution for this? Any recommendations? Thanks!