Slightly confused about setting up the n50a, I have read the book it came with, however it fails to make a few things clear, I am mainly playing my cd collection which I have encoded to alac, and flac which are on a usb hdd plugged into the rear of the unit. My first question is, in settings should digital out be on or off its default setting is on, I am looking to achieve the best settings for the best sound without too much tinkering.....