I have a Samsung KU6300 4K TV and I'm trying to get the audio output to my Panasonic SC-BTT490 HTS via Digital Optical Cable, but am not getting sound. I've set the TV to push Audio to Digital Out, instead of speakers, and both set the Panasonic to default TV audio to Digital In and also manually selected Digital In as source. Trying a different route, I moved the Panasonic HTS HDMI connection to the HDMI (ARC) connection on the TV and switched its audio from Digital Out to HDMI, but still nada. Running out of ideas, so any help really appreciated. Thanks