Audi MMI   MMI control console   Basic operation  Other settings
Select: Function selector button MEDIA > function selector button SETUP > In-car entertainment fader.
You can use the In-car entertainment fader to adjust the volume of the current audio/video source during a voice guidance cue or while the Audi parking system* is switched on.
You can also set the In-car entertainment fader in the modes Radio, Navigation, Traffic information or Car.