Yamaha AW4416 Operation Manual page 202

Chapter12—Sampling pads
7. Use the [DATA/JOG] dial to specify the amount of trimming in sample
units.
8. Press the [ENTER] key.
9. Move the cursor to the EXECUTE button, and press the [ENTER] key.
A popup window will appear, asking you to confirm the trimming operation.
10. To execute the trimming operation, move the cursor to the OK button
and press the [ENTER] key.
The beginning or end of the sample will be deleted as you specified. Strike the
pad to hear the results.
Once you execute the trimming operation, it cannot be reversed by pressing the
[UNDO] key. If you wish to make fine adjustments again, you must re-assign the
region.
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— Operation Guide