The repeat button has three modes:
Off mode will stop playback when the end of the song is reached.
Song mode will automatically start playing the song again from the beginning when the end is reached.
Section mode allows you set repeat start and end points. Playback will automatically jump back to the repeat start point when the end point is reached.
To set the repeat start point while the song is playing, tap the ‘Set Start’ button when you hear the beginning of the section you wish to repeat.
To set the repeat end point while the song is playing, tap the ‘Set End’ button when you hear the end of the section you wish to repeat.
Both the start and end points can also be set while playback is paused. Drag the playhead to desired position and tap the ‘Set Start’ or ‘Set End’ buttons as desired.