I have a Denon 3600. I have Apple TV connected directly. Recently installed HD Homerun and Channels DVR. I get no 5.1 sound on HD homerun ap, even though the receiver shows it’s getting a 5.1 signal. When I connect Apple TV. Directly to my tv and run the audio via ARC back to the receiver, it works as expected. I get 5.1 sound on the channels that have it, stereo on those that don’t. Anyone know what is going on? Would like to connect directly to the receiver and avoid using ARC.