There's not a way to change the behavior of the source buttons (since they double as the input selection buttons), and the 950 didn't allow you to permanently assign the six channel analog input as the audio source for an input. There is an option, though. I used an old macro trick to set one of the "M" buttons at the bottom to act as a duplicate of the "6CH" button. That way, I could select "DVD" and just hit "M3" to toggle the six channel input on for DVD-Audio. This would also let you use your HD-DVD player for regular DVD's with the digital output or for HD-DVD's with the multichannel analog output.