Basic A/B Looping is a feature that can be used with any video or audio mp3 in the Pro Player. Here's how to use it.
While playing, when the video (or audio mp3s) reaches the beginning of the section you want to loop, click the "[ A" button to set the loop starting point.
The loop start button text turns green to indicate that the starting point of the loop has been set.
When the video reaches the end of the section you want to loop, click the "B ]" button to set the loop ending point.
As long as the player is in looping mode, the looping button will turn red and all other buttons will be disabled (except for the Play/Pause button).
The looping region of the timeline will be highlighted while the player is in looping mode.