Thanks Edmund for the link and for the help. Here is a recap of what worked for me with my HR20 and my R15. All the credit for the following instructions goes to thekochs and again to Edmund over at RemoteCentral.com.Edmund said:
Tried this but in RF mode I lost the ability to control my Television's VOL. and MUTE buttons.naijai said:set the HR20 to the RF mode and you are set
Thanks EarlEarl Bonovich said:Choose which one you want to work with the remote on DirecTV mode.
Then cover that IR on that one (or unplug it).
Then go into the Setup->Remote on the other unit.
And follow the instructions to set it up on the AV1/AV2 setting.
The DVR Plus line has two distinct IR codes.