These combo units are getting to be a pain in the xxx.
One problem is with all the functions you'll need for the dvd control doesn't leave many left to control the receiver. I'd suggest using the dvd setup code on a device button, then find the audio code for the receiver portion. You may even need to find one for the amp portion and another for the tuner section. You should still be able to use the receiver's volume when in dvd or tuner mode with VPT or keymoves. For all the functions on one device mode would probably require a remote with 60 buttons.
Jim