I assist with IT work in a school the AV side is a bit foreign to me. We have to identical setups in our gym and cafeteria. They both have a dvx-2255hd. The issue we have is that the audio overflows to the other room regardless of which one we play. The overflow button on the wall panel makes no difference. We have to cut the power on one setup to isolate the audio to one room. We also cannot play the two at the same time independently because of this. Any help appreciated !