TjB
I don't have the 6 analog cable setup for DVD-A/SACD and only use an optical connection. I also haven't been through the manual to look for the answer to your questioon.
Logic tells me that that you could connect both 6-way and optical or coax and switch the optical/coax when watching TV/movies.
There are likely settings in the setup menu that lets you set all of the audio up and the remote likely lets you choose the audio. I wish I had time to chase this for you, but we are leaving for the day.
