152 Operating system Audio systems 1 Also possible in Bluetooth ® audio mode. Function F SRC RPress briefly: Selects an audio source: Radio CD playback USB AUX function BT audio (MP3 playback) Exits the menu RPress and hold: Ends the current traffic report G BND RPress briefly: Switches wavebands RPress and hold: Stores stations automatically H E RRadio: - Press briefly: Station search backwards - Press and hold: Manual station search RCD and USB audio mode: - Press briefly: Skips back1 - Press and hold: Fast rewind RAUX mode Switches over to a front AUX port I AUX socket J Mini USB port