See also:

The concept
The following can be operated using the buttons and the thumbwheel on the steering wheel: Current audio source. Redial on telephone*. Activation of the voice activation system*. ...

General information
The channels are offered in predefined packages. The packages must be enabled by telephone. ...

Adjusting the volume
Adjusting the volume Turn the knob until the desired volume is selected. The setting is stored for the remote control currently in use. The vehicle automatically adjusts the volume of the mic ...