Akai MPC User Manual page 313

To switch between the looper and the normal sampler,
click Looper or Sampler above the Q-Link Knobs.
Hardware: To switch between the looper and the normal
sampler, press F1 (Sampler or Looper).
To set the length of your loop, click and drag the Num Bars
field up or down.
Hardware: To set the length of your loop, use the Cursor
Buttons to select the Bars field, and use the Data Dial or –/+
buttons to adjust the value. Alternatively, use the numeric
keypad to enter a value.
The Looper tab in Sample Record Mode in the MPC hardware display.
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