Audiovox D1988PK Owner's Manual page 15

5. A-B REPEAT
a. During playback press 'A-B' to set the Starting Point A.
A-B Repeat Starting Point Screen Display
b. Press 'A-B' a second time to set the Ending Point B and the
player will repeatedly play the part between Point A and Point
B.
A-B Repeat Ending Point Screen Display
c. Press A-B a third time to cancel A-B repeat and resume
playback.
A-B Repeat Cancelled Screen Display
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