Już znalazłem zadziałało :) Dla zainteresowanych Changing speed sensitive volume control On cars with NAV Get in the car, close the door, and turn the ignition to position 1 (accessory. As soon as the monitor comes on, press and hold the RDS (SEL) button for aprox 12 sec. Using the arrow keys, near the Tone and Select buttons, scroll to heading "GAL" (German acronym for speed depandant volume) The default setting will be displayed. To change, use the number keys 1-6, 1 being less increase, 6 being maximum.