iDM idMEDIA 8, Руководство пользователя

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3.3 Sound Setting
Voice settings includes four main functions: Reverse mute, Navi audio channel, Navi volume and Device ringtone:
3.3.1 Reverse mute
By default, radio sound is on. When you remove the tick for Reverse mute, sound will be mute.
3.3.2 Navi volume
1) Navigation: the volume of the navigation can be adjusted with the slider. The new setting is effective only when
the navigation is set.
2) Background music: when sliding progress bar, you can adjust the volume of the current source. Drag to the left
to turn down the volume, drag to the right to turn up the volume.