@tmm1 I had been running with the default audio driver but last night changed to experimental. Audio sounded crazy when playing back an OTA recording. Changed back to default audio driver and everything returned to normal. This afternoon I tried it again and had the same issue. While this was happening, I looked at my marantz receiver and the audio was in atmos mode while the experimental driver was engaged. I changed back to the default audio driver and then everything sounded normal and the receiver switched back to multichannel/dolby surround.
I submitted diags from the atv