Apple Logic Pro 8 - Manual (Page 474)

474 Chapter 20 Editing MIDI Events in the Transform Window
Maximum Note Length
Sets the maximum length of all note events.
Change the Length value field in the Operations area to define the maximum note
length. Existing note lengths—which are shorter than the length defined here—are
retained. Events that are longer than the defined value are shortened.
Minimum Note Length
Sets the minimum note length.
Change the Min value field in the Operations area to define the minimum note length.
Existing note lengths—that are longer than the length defined here—are retained.
Note events that are shorter than the defined value are increased in length.