Akai MPC X User Manual page 403

If Event Type is set to Drum Events:
To select the pad bank that will be used to generate the events, use the Bank field or select Range to
use the Start Pad and End Pad menus to define a specific pad range instead.
To define a specific pad range over which the events will be generated, use the Start Pad or End Pad
fields. You can use these fields only if the Bank menu is set to Range.
To set how closely together the events will be placed in the track, use the Density (%) slider.
To set how widely or narrowly the rhythmic patterns of the generated notes vary, use the Rhythm
Variation slider.
If Event Type is set to Melodic Events:
To define a specific note range over which the events will be generated, use the Start Note or End Note
fields.
To enable or disable legato, tap the Legato checkbox.
Without legato applied.
When on, the generated notes will be extended or shortened to create a long, unbroken phrase from the
first note event's start point to the last note event's end point. Each note event will sustain until another
note event starts. If multiple note events start at the same time (and are not the last note events), their
lengths will become identical.
When off, the generated notes will use the duration set by the Note Length menu.
With legato applied.
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