The streambar responds to the same IR code roku ten years ago used, but they added a few new commands for tv power, volume, and mute. Those aren't attached to any preset roku code in any universal or oem remote. But if you have the streambar setup up via hdmi-cec to your tv, you don't need the roku streambar tv commands, the tv volume from the tv code in your cable remote should control the streambar same as the streambar volume keys do. They control each other.
Edmund
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