Apple Logic Pro 9 - Manual (Page 729)

Random Pitch, Velocity, Length
Sets a random pitch, velocity, and length for note events.
Change the Pitch, Velocity, and Length condition values to alter your selection ranges.
Crescendo
Used to gradually increase the velocities of a group of notes from low to high values (or
vice versa—decrescendo or diminuendo).
• Select the area (Position column) that contains the note events that you want to perform
a crescendo on.
• Set the velocity values in the Operations area, ranging from 1 to 127.
729 Chapter 26 Editing MIDI Events in the Transform Window