@Markskwirut
Thanks for the post.
Roku remote can be paired to your Samsung TV to control your TV power and volume, but please be aware that the Roku remotes do not support functionality of controlling external audio products such as your Vizio soundbar.
For more detailed information about how to pair your Roku device remote to your TV, visit our Support page here: Set up TV controls
Thanks,
Danny
Danny R.
Roku Community Moderator