Thanks, but I don't get the programming warning (TV was programmed to a dummy Sony) and when I switch to AV1 using the slider switch and use the volume, it still doesn't work. It seems that at some point between when I acknowledge that the IR code worked (I know this because the volume up/down worked) and when the directv remote setup menu closes, it "forgets" all of the codes. It's really weird, because I've done this with other similar remotes many times with other equipment.

So here's a summary:
1. I am able to get Vol+/- working when setting up the remote in the directv menu.
2. I acknowledge it's working, then after that the volume will not work, and here's how I've concluded that:
2a. slid switch to AV1 and pressed Vol+/-...no luck even though the remote is showing via the LEDs that it's sending the volume commands from AV1.
2b. programmed punch through to all devices... no luck
2c. programmed punch through to this device... no luck

The power button does work, however... I can standby the unit by switching to AV1 and pressing power. But volume and mute do not work.