Apple Logic Pro 9 - Manual (Page 733)

Reverse Pitch
Inverts the pitch of all note events.
Change the Flip operation value to set a pivot point note number, around which note
event pitches will be reversed.
Transposition
Transposes all note events.
• Change the Add operation value to the desired amount (in semitone steps).
• You can achieve downward transpositions by setting a negative value in this field.
733 Chapter 26 Editing MIDI Events in the Transform Window