Source for Volume

A while back I switched the volume control for AV1 to be controlled by the TV.  I have a  DVD player hooked up to AV1 that has a volume control.  I changed a setting in the remote control so that I can be switched onto AV1 but the volume button changes the TV volume.  I now want to switch it back to the volume on AV1 being controlled by AV1.  My remote is a RC64.