Re: TCL alto 6+ soundbar

I wish to use my xr11 voice remote to control a new TCL Alto 6+ soundbar. My TV doesnt have an hdmi arc connection as it is an older vizio tv (vf552xvt). As an older tv it seemingly predates TCL as a company and doesnt offer a way to connect via its internal option to control external devices. Any one have any suggestions? My google sluthing skills are usually up to the task but after an hour of trying I am at a loss here as I have found zilch!!