Identify which device the volume keys should control
Note whether Aero’s remote currently changes its own internal volume or should control a television, receiver or soundbar. Manhattan says the optional CEC Volume Control switches the remote from Aero’s internal volume to the connected device’s volume commands.
The manufacturer introduced this setting in software 19.1021.153 and leaves it off by default because compatibility varies. Record the installed software before looking for the setting under Devices; older menus can place related controls under Inputs. A working power key is evidence about a different CEC command.
Check the television’s role in the path
Manhattan says CEC commonly uses the TV as the hub, so an unsupported TV volume mode can prevent control of a soundbar connected through it. Its current guide specifically excludes LG televisions from this Aero volume mode and describes differences across other brands and model years.
Keep the exact models and HDMI connection order with the comparison. A soundbar advertising HDMI-CEC does not establish compatibility through every television. The manufacturer says a prospective infrared alternative has no firm release date, so do not treat that future possibility as a current fix.
Test the documented mode deliberately
For a supported comparison, Manhattan instructs setting Aero’s internal volume to maximum before enabling CEC Volume Control, then testing the connected equipment’s volume commands. Establish a comfortable downstream listening level and follow the current manufacturer sequence for your equipment.
If volume commands still do not work with CEC enabled on the relevant devices, record that result separately from power or navigation commands that do. Provide software, TV and audio-device models to support. This avoids repeatedly re-pairing a remote when the limitation lies in the documented CEC volume path rather than its basic connection to Aero.