DXG Technology DXG-305V - Manual (Page 31)

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Playing MP3 Files:
In MP3 mode, press the select button up or down to select the MP3 files that
you want to play, then press the ok button. At this time, you will see the time
length and the baud rate of current MP3 file. To play MP3 song selected, press
the shutter button.
Volume, Bass, Treble Adjust:
When playing MP3 files, press the up or down button of the multi-func
button to adjust the volume , press the ok button to switch between volume,
bass and treble.