i dont understand that it wont control the lighting system is it supposed to and how do you do it?
how do you turn it on rf?
also why if i change input to hddvd and try to change the volume i have to go back into the denon to change the volume do i have to change it that much?

Here is a reply I posted in the 880 thread to a similar problem:

Go into each of your "Activities" and tell it that you control the volume with your receiver.

Under "Watch DVR", click "settings", check "Review the settings for this Activity", check "No, I want to run the setup wizard again to change these settings." The first question it asks me at this point is "To Watch PVR, which device do you use to control the volume?". Tell it to use your receiver. Do this for each activity in which you want to use the receiver to control the volume.

Hope this helps.