If you have an android roku remote app and you use the icon for headphone you can mute any TV. I have a Samsung and it works. I have no idea why they can't make a remote to can connect to your WiFi and use that like the android app and have a headphone icon so that if you don't have any headphone attached to the Roku remote then it would MUTE. Why hasn't someone thought of this' when they designed the remote. It isn't rocket science. Mike
I do not think it is too much to ask that ROKU include a MUTE button on its Remote, as most any Remote has. For what we pay for a ROKU Ultra, we should not have to screw around with messing with the Voice control, or using our TV remote to mute! Come on ROKU, step up and fix this!