Hey. My amp used to change to Dolby when I was on Sky HD. I have went through every channel and none of them are lighting up my amp. I have put a optical in the Amp and Sky Box. I have assigned audio in the amp under Sat. for optical 1 And the Sky Box is set up correctly. Any thoughts, as I have moved, and cant remember what I did last time. Optical lead: Check Input Assign: Check Sky HD: DD Signal check. But nothing is lighting up the Onkyo TX-NR818 were it scrolls across Dolby Digital. Thanks so much. I have no rear speakers at the moment, but that should not stop the amp lighting up dolby Digital... Or Should it.