Hmmm..., just took a look at the manual and on p.80 it states that if you change the decoder mode setting from "Auto" to "Last" that the last mode that was being used(DPLIIx, etc.) when you shut it off will still be in effect the next time that you turn it on. Now, this refers to the digital inputs, and I wonder if you have to use the coaxial or optical input(rather than HDMI, which is also digital, of course)for audio for this to take effect.

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Enjoy the music, not the equipment.