Akai MPC TOUCH User Manual page 224

Pan adjusts the stereo placement of the respective layer.
Velocity defines the velocity range of each layer. To set the values, click
in the segment chain on the right side of the Layer area and drag its left
and right ends to the desired values.
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.)
Use the Root Note field to set the root key of each loaded sample.
The virtual keyboard shows the Note Range, which can be set in the Key Group section. You can also
drag the left or right range with your computer mouse.
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