This may be a dumb, or obvious, question, but bear with me. I just got a new LG tv, and my setup is as follows: HDMI connection between VMS4100 Fios TV One box and Onkyo receiver (cable/STB port), and HDMI connection between eARC port onTV and HDMI out on Onkyo receiver. It's working fine - the TV is set to ARC mode and internal speaker off, and the Fios remote controls the volume. I went into the Fios settings to make sure that there was nothing I need to do there. Volume control is set to Fixed, which I believe is what it should be. Audio passthrough is set on Disable. This is what I'm trying to figure out - what would audio passthrough do in this setup, and should it be enabled? Also, Audio Selection is set to Disable - what does that do?
Thanks in advance for your help!