I have a TCL 55P605, and it recently got Roku OS 9.1. The audio leveling features sound pretty useful. That said, all the information I've found on how to enable it don't work for me. The place under * > Volume Mode is set to "Off", appears disabled, and pressing the right arrow does nothing.
I'm guessing this is because I'm using ARC. I haven't yet tried turning ARC off.
Does anyone know if this is a bug, designed behavior (that would be unfortunate), or ideas what might be going on if unrelated to ARC entirely?