X-Micro Tech. EVA 310 - Manual (Page 24)

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6.8 Exit
Return to MP3 mode.
Note: From setting mode, you can press the MENU button to exit the setting mode quickly.
7. Other functions
7.1 A-B Play Mode
From MP3 or voice mode:
(1) Press the REC button to select starting point A.
(2) Press the REC button to select end point B, then it will repeat between A-B.
(3) Press the REC button again to cancel setting and resume playing MP3 or voice.