Apple Logic Pro X - Manual (Page 480)

Chapter 15 Advanced edit features 480
Randomly change the pitch of MIDI note events
1 Choose the following settings in the MIDI Transform window:
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Mode pop-up menu: Apply operations to selected events.
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Selection Conditions area: Set Status to Note.
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Operations area: Set Pitch to +-Random, and set the max deviation from the root note in the
field below. If you set a value of 12, you’ll achieve a deviation of one octave up and one down
(two octaves, around the root note, in other words).
2 Click Select and Operate.
Tip: To restrict the randomness to one direction—up or down, as opposed to both—use the
other Random Option, which limits the range that notes fall into.
Make note selections for edit operations
1 Choose the following settings in the MIDI Transform window:
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Selection Conditions area:
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Set Status to Note.
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Set Position to Inside, then choose the range.
2 Click the Select Only button.
All notes in the defined range are selected for you to cut, move, or otherwise modify.