Apple Logic Pro 8 - Manual (Page 470)

470 Chapter 20 Editing MIDI Events in the Transform Window
Humanize
Adds a random value to the position, velocity, and length of selected note events. This
preset is useful on rhythmic parts, such as clavinet or piano accompaniments, and
drum and percussion regions (or events). It can add life to strictly quantized material, or
notes that were manually entered (see “
MIDI Step Input Recording ” on page 384).
Alter the values for Position, Velocity, or Length to increase or decrease the random
factor for each of these event parameters.
Reverse Position
Reverses the positions of events (usually notes) within a section.
Change the Position condition values to alter your selection range.