Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

Sound bar help

I have my onn sound bar connected to my roku hisense tv through an optical cord but I can't find out how to use my roku remote to turn the sound bar up and down please help

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