3.Push the Menu Switch to the right (Next) 
or to the left (Previous) 
, to select a desired MP3/WMA file.
4.Press the 
button to play the MP3/WMA music file.
T.sonic™ 520 only supports Mpeg I Layer 3 and WMA files compressed at a rate of 32Kbps – 320Kbps.
Navigation Function
The Navigation function allows you to easily move between tracks, files and folders.
•In MUSIC mode. Press and hold the Menu Switch inwards (Menu) 
to enter the Navigation Function.
•Push the Menu Switch to the right (Next) 
or to the left (Previous) 
to select a desired MP3/WMA file, or folder.
•Press the 
button to enter the selected folder or to play a selected
MP3/WMA music file. Or press the Menu Switch inwards (Menu) 
to move up one folder level.
•Press the Menu Switch inwards (Menu) 
to move up one folder level repeatedly to reach the root directory (top level folder).
•If you are at the root directory (top level folder), you can press the Menu Switch inwards (Menu) 
to quit the navigation function.
A-B Repeat Function
Follow the procedures below, to repeat a portion of a track.
1.While Playing an MP3/WMA, or WAV track.
•Press the 
button to tag the beginning of the track’s portion you wish to repeat. The ‘A‘ symbol will be displayed on the OLED Display.
•Press the 
button again to tag the end of the track’s portion you wish to repeat. The
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