I am trying to use an RC72 with an HR24-500 in IR mode. It works for the most part. I can’t figure out how to lock the volume to a Denon 3310CI. In the “program remote” setting it calls for the mode slider switch to be placed in AV1 or AV2 position to do this. There is no mode slider switch on an RC72. Does anyone know if I can program The RC 72 with an HR24 to do this?