It is under the "other: section on menu, I have mine selected as Progressive "ALL" as I use component video cables exclusively.
Just make sure "audio" is first selected on remote (top button on left) then hit "M" (just below mute) then pull up system status screen then once "system status" is listed hit select. then scroll down to "other" and its right there.
I know about every single trick, setting and flaw of the 1068 so mail me if you need and we can do it over the phone, I can show you some secrets too.