I used a 9000es like that for a while and I don't recall what the button is called, but you can press a button on the unit when there is no disc playing(i.e. it can NOT be done on the fly). The button is really small and hard to press but it will keep the unit locked in what ever output configuration you like. Wish I could be more help, but just remember you still have a 5 year waranty with it so you sould be fine- sony is known for there reliabilty. BTW I couldn't figure out how to operate that function from the remote, that unit does so much stuff- you could read the instruction manual over and over and find new bells and whistles every time!
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