PIONEER DJ Serato DDJ-REV5 Instruction Manual page 50

Fine-adjusting loop points
1 Press the [1/2X] or [2X] button while pressing the [SHIFT]
button during loop playback.
— [1/2X]: Adjusts the loop-in point.
— [2X]: Adjusts the loop-out point.
2 Turn the jog wheel to fine-adjust the loop point.
• Press the [1/2X] or [2X] button while pressing the [SHIFT] button to resume loop playback.
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Serato DJ Pro