Hi @dhyde,
Thanks for the inquiry and for making your first post here in the Roku Community.
If you're using a private listening feature on your Roku device, automatically, the audio on your TV or device will be transmitted directly to your headphones, and the sound on your television will be muted. For more information, you may visit our support page here: How to use the private listening feature on Roku devices
Let us know if this information is useful for you.
Thanks,
Rey
ERey.
Roku Community Moderator