Akai MPC X User Manual page 229

The third Samples tab contains the control for its offset and velocity range.
Use the Offset slider to determine a time offset for the sample's playback.
Positive values (right of center): When the pad is played, playback will start immediately but at a later point in the
sample specified by the offset value.
Negative values (left of center): When the pad is played, playback will be delayed by the amount specified by the
offset value.
Use the Vel Start and Vel End knobs to define the velocity range of each layer.
A range from 0 to 127 lets the layer respond to the entire velocity range which is input from the respective pad while,
for example, a range from 100 to 127 lets the layer respond only to higher velocity levels. By assigning several
samples of one instrument, you can create a realistic-sounding "multi-sample" by adjusting the velocity ranges of
each layer accordingly.
For example, you may have three samples of a drum hit with low force, medium force, and high force. You can set
each sample to a layer and set the Velocity ranges so only low velocities trigger the low-force sample, only mid-
range velocities trigger the medium-force sample, and only high velocities trigger the high-force sample.
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