Hi, @jabramson
Thanks for posting, and welcome to the Roku Community.
We appreciate you for inquiring about the Roku remote compatibility. Kindly be advised that your Roku voice remote is designed to control power and volume for your TV. It cannot directly control other devices connected to your TV, such as an audio/video receiver (AVR) or soundbar.
However, your TV may be able to issue volume commands to your AVR or soundbar using a technology called HDMI-CEC. In these cases, your Roku voice remote can indirectly control volume for your AVR or soundbar. For this to work, all your devices must be connected via HDMI®, and all devices must support HDMI-CEC and have this feature enabled. To learn if your TV, AVR or soundbar supports this technology refer to the documentation for each device. Be aware that manufacturers may refer to HDMI-CEC by a different name.
We hope this clarifies your inquiry.
All the best,
Kash
Takashi O.
Roku Community Moderator