I have a Directv receiver with an optical output. Some shows are in DD5.1. The problem I have is that the HK520 will detect the DD5.1 signal like it should (when its available), but when I switch to a show that isn't in DD the HK520 will switch to "Surround Off" rather than PLII. Is there a way to make it default back to PLII or Logic 7 instead of "Surround Off". Thanks.