"When trying to change modes, is the CD player playing at the time? If it is stopped, there would be no bitstream coming to the 990 and it wouldn't be able to determine what modes might be available."
It was stopped.
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Outlaw 990 AVP,Outlaw 770 Amp,Infinity Beta 50 F L-R,Infinity Beta 360 C,Infinity IL10 S L-R,Velodyne CT-150 SW, Denon 2910 MDP, Pioneer PD-F908 CD