- Official Post
It is working as intended. When Surround sound is active the box passes through the audio stream to the TV or AVR. The TV or AVR is responsible for decoding the audio stream and therefore the volume must be controlled from those devices.
You should program your Formuler remote to control the TV volume as it will be more convenient than switching remotes all the time.
Do you have the IR remote (basic) or BT1 remote (bluetooth?)