TechniSat DIGITRADIO 231 OD Manual page 109

6.4.3 Switching between operating modes
> Press the MODE (3) button to switch between DAB+ (Digital Radio), FM,
Bluetooth and AUX modes.
6.4.4 Adjusting the volume
> Adjust the volume with the Volume +/- buttons (9). The set volume is shown on
the display by a bar chart.
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