Audio OperationSwitching On and OffAdjusting the VolumeSelecting an Audio SourceSet/save DAB+ radio stations (GPB18V‑3SC)Setting/Saving FM Radio StationsSetting the Rod AntennaPlaying Back External Audio Sources via Bluetooth®Controlling External Audio Sources via Bluetooth®Playing External Audio Sources via Multi-Speaker SoundTransmitting the Current Playback via Multi-Speaker SoundChanging SettingsMenu Options (GPB18V‑3C)Menu Options (GPB18V‑3SC)