Akai MPC X User Manual page 243

The first Samples tab contains the sample waveform for each layer and controls for its pitch, timing, and playback.
The upper half of the screen shows the waveform of the sample on the currently selected layer. The lower half shows
the editing controls.
The waveform display shows the "active" section of the clip waveform. Swipe left or right on the waveform to move
through it.
Above the waveform is the timeline, shown in bars, beats, and ticks.
Use the bottom-most Q-Link knob in the fourth bank to zoom in or out of the sample waveform.
Tap each layer number (Layer 1–4) under the waveform to select it. When selected, its sample waveform will be
shown in the upper half of the screen and its settings will be shown in the lower half.
Use the Sample field to select the sample file for that layer. Remember that the sample has to be loaded into the project's
sample pool beforehand. For information on how to load samples into a project, please see the Browser chapter.
Important: The parameters in the Samples tabs work in conjunction with Chop Mode (in Sample Edit Mode). Here's
how it works:
When working in Sample Edit Mode and using Chop Mode to divide a sample into slices for your pads (keygroups),
you can convert a slice using Non-Destructive Slice or Pad Parameters.
A Non-Destructive Slice will let its keygroup to refer to that slice when you press a pad in that keygroup; the original
sample remains intact and each slice marker is like a "bookmark" for a keygroup. In Program Edit Mode, you'll see
that the layer to which it's assigned has its Slice drop-down menu set to the corresponding slice number in the
original sample. Playing that keygroup will cause it to refer to that slice marker like a "bookmark" instead of creating
an entirely new sample of that slice. This means that you no longer have to clutter your project with a new sample for
every slice (though you can still use this earlier method, if you prefer).
A slice converted using Pad Parameters is very similar to a non-destructive slice described above. The difference is
that in Program Edit Mode, the layers they're assigned to have their Slice drop-down menus set to Pad (instead of
the slice number), and the start and end points will correspond to the slice markers in the original sample.
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