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
Select the notes you want to quantize.
Choose the scale and key from the Scale Quantize pop-up menus.
For more information about Flex editing, see Flex Time and Pitch overview.