Orbit Pro - How to Adjust Volume?

If you connected your Orbit Pro to your TV via either 3.5mm AUX or RCA, you should be able to adjust volume using your TV remote.

On the other hand, if you're using HDMI/ Digital Optical (SPDIF/TOSLINK) connection, your TV remote control cannot adjust the digital audio output level and makes no impact on the volume.
In this case, you can adjust the volume by using the Remote of the Orbit pro or adjust the volume on your headphones.