Apple Logic Pro 9 - Manual (Page 655)

• 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.
Using the Grid in the Piano Roll Editor
The grid provides a valuable reference for note lengths. You can see both the start and
end positions of note events, aligned with the time values shown in the Bar ruler. This
simplifies note length editing.
The default grid lines shown are:
• A black line at every bar and beat.
• A light gray line at every division value (you can alter the division value in the Transport
bar).
You can alter the appearance of this grid and other aspects of the Piano Roll Editor (see
Customizing the Piano Roll Editor ).
The vertical keyboard on the left side of the Piano Roll Editor indicates note pitches.
Horizontal black lines run across the screen between notes B and C, and notes E and F.
These lines are very helpful when transposing notes by dragging them up or down.
Using the Info Display in the Piano Roll Editor
The Piano Roll Editor’s info display indicates the current position and pitch of the mouse
pointer within the region.
Info display
You should refer to this real-time display whenever making a selection.
Tip: Activate the MIDI Out button next to the Piano Roll Editor’s local menu bar to hear
your edits as you make them.
655 Chapter 23 Editing MIDI Events in the Piano Roll Editor