My Roamio is going through an Onkyo HT-R695 receiver via HTMI. Hitting the info button on the receiver tells me the input audio format and the output audio format. Roamio is coming in with PCM 2.0 while the same channel off air from the TV and a Hopper 3 via OTA module are showing Dolby 5.1. In the settings of the Roamio I have Dolby digital selected. Is the HTMI output of the Roamio limited to PCM 2.0? Is there another setting on the Roamio that I'm missing? Do I need to go the the receiver via Optical? I can't just try Optical because I don't have a spare optical cable laying around. I'm also worried about lip sync issues with video via HTMI and audio via optical.