Hi, @adiaz7531.
Thank you for posting here in the Roku Community.
We'd be more than happy to provide further information about this.
The remote only works with TVs using IR codes and cannot control sound bars or AV receivers. If your TV and sound bar support CEC control, the Roku remote might control the volume through that method, but not through IR.
Here's our support article to help you set this up: How to set up your Roku voice remote to control your TV
You may visit this Community post for further information about this case: Set up Roku 4K Stick to control volume of external soundbar.
I hope you find this information helpful.
Best regards,
Carly
Carly Y.
Roku Community Moderator