Apple Logic Pro X - Manual (Page 358)

Chapter 12 Edit MIDI regions in the Piano Roll Editor 358
Quantize the pitch of notes in the Piano Roll Editor
You can quantize the pitch of notes in MIDI regions to a particular scale or key. This is especially
useful when you want to reuse a repeating pattern of notes, but transpose them to a
different key.
Quantize the pitch of notes in a MIDI region
1 Select the notes you want to quantize.
2 Choose the scale and key from the Scale Quantize pop-up menus.
For more information about Flex editing, see Flex Time and Pitch overview .
Lock the position of events in the Piano Roll Editor
Sometimes you may want to protect some events in MIDI regions from being moved; for
example, when they are synchronized to visual events in a movie. You may have already created
the music for the scene, but are then asked to increase the tempo to match several cuts of
different camera angles in the corridor. Changing the tempo will move the events, resulting in
their being out-of-sync. Instead, you can lock the events to an absolute (SMPTE) time position, to
protect their position and keep them in sync with the tempo.
To lock the time position of events, Advanced Editing Options must first be selected in the
Advanced preferences pane.
Lock the position of one or more selected events
m Choose Functions > Lock SMPTE Position in the Piano Roll Editor menu bar (or use the
corresponding key command).
This command ensures that events that fall at a particular absolute time position—1 hour,
3 minutes, 15 seconds, 12 frames, for example—remain at this exact position regardless of
tempo changes.
Unprotect protected events
m Choose Functions > Unlock SMPTE Position in the Piano Roll Editor menu bar (or use the
corresponding key command).