I'm at a dead end here. I just bought a Vizio soundbar with surround sound speakers and a subwoofer today. It has aux, optical, red/white cable, bluetooth, hdmi in, and hdmi out (ARC) inputs. I also have a 55" TCL 4k TV I recently bought from walmart. I had it hooked up to my old LG soundbar and sub with an aux cable, so that I could control my volume with my TV (roku) remote. I originally just hooked this new Vizio soundbar up the same way with the aux, and although it worked there was constant static no matter which aux cable I used. The optical and red/white cables both work fine, but I have to use the soundbar remote to change the volume. I figured I'd update and use the HDMI ARC output. On the TV it is an obvious option as it is marked as HDMI 1 (ARC). I've hooked it all up correctly and it will not work. I go to system settings, and CEC function and I check HDMI ARC as well as System audio control, and then I search for CEC devices and nothing comes up. Also in an attempt to just use an optical cable, these soundbars have a feature to learn new volume commands so you can keep using your TV remote, but of course this ROKU remote doesn't work for it. Any help here guys would be very appreciated.