Now that you have recorded some MIDI, you can go back and edit it. There are   a few ways to edit MIDI in Logic, and we’re going to look at just one of them now.


  • To edit a MIDI region in the Piano Roll:
  • Double click on the region in the Arrange Window
  • OR Select the region and click the Piano Roll Tab at the bottom of the Arrange Window
  • OR Open a separate Piano Roll window from the Window menu [⌘6]
  • MIDI note events are represented by horizontal rectangles, aligned on a grid of horizontal and vertical lines.
  • The horizontal placement of note events indicates their temporal (bar, beat, and sub-beat) positioning within the region, and project.
  • The vertical position of note events indicates their pitch, with those nearer the top of the Piano Roll grid being higher in pitch.
  • Chords are displayed as a vertical stack of note rectangles. The alignment of notes in chords is not always identical, as not all notes in a chord may be struck, or end, at the same time.
  • The length of MIDI note events is directly related to the length of the rectangles, so notes such as hemidemisemiquavers (1/64th note), quavers (1/8th note), crotchets (1/4 note), minims (1/2 note), whole notes, and so on can be easily recognized.
  • If you make any mistakes during recording, you can correct these mistakes by dragging the rectangles up and down to correct pitch, or left and right to correct rhythm.
  • MIDI notes can by resized by dragging their start/end points.