I'm thinking of getting an AX5i to go with my 757 DVD and using ilink for dvd,cd,sacd and dvd-a. I've read that you have to switch between 'movie' and 'music' modes when you swap a CD for DVD. Does the iLink input not have an auto function that can tell what sort of signal is coming in and switch to that eg. 2ch PCM for CD, DD or DTS for DVD's, 5.1 channel audio for DVD-A or SACD? Say I'm watching a DVD in DTS and want to listen to a SACD. What would I need to change?