Sling has surround sound only on its premium movie channels. I wouldn't think that would cause the squeaking though.Quick question. When I use the SlingTV through my ATV 4K and run the audio through my AVR and speakers using surround sound, the audio is awful. There is a squeaking sound that hurts my ears. However, it is not there when I put the AVR in stereo. I do not have this problem with any other app on my ATV. Any ideas? Thanks!