122 On-board computer R the track when in CD, USB or Bluetooth ® mode R the AUX source in Audio AUX mode R the waveband in radio mode R the MP3 browser in CD or USB mode X Select the desired menu bar with the r or s button. X Change the audio source, track or station with the u or t button. When using MP3 files stored on audio CDs or a USB device, you can navigate through fold- ers and select your MP3 files for playback. To operate the MP3 browser Telephone menu window = Ends/rejects an incoming call W Increases volume X Decreases volume ; Makes or accepts a call/displays the On-board computer and displays X Press the 9 button. X Open the Audio menu window. X To accept a call:
press the ; button. The on-board computer shows the caller's number or Unknown number . X Select the MP3 browser menu bar with the r or s button. X To adjust the call volume: increase or decrease the volume during the call with the W or X button. X To open the MP3 browser: press u or t . X To reject or end a call: press the = button. X To change the MP3 file/folder: press r or s . X To open an MP3 file or folder: press u . Audio menu window X To close the current folder: press t briefly. Audio source, track/station/frequency, MP3 browser The Audio menu window is available on vehi- cles with the Mercedes-Benz CD radio. X To close the MP3 browser: press and hold t .
X Switch on the CD radio ( Y page 148). Setting the volume X Use the u or t button to scroll to б audio and communications. X To display the audio source and the title/station: use the r or s button to scroll to the Audio menu window. X To change the audio source or track/ station/frequency: press 9 . Depending on the active audio source, the input window displays: R the name of the audio source R the station or frequency when in radio mode It is always possible to adjust the playback volume in audio mode. X To increase or decrease the volume: press W or X .