The Score Editor can display a single MIDI region or software instrument track. In the Score Editor, each track appears as a separate staff. Notes, rests, and other musical events in the MIDI regions on the track are displayed in standard musical notation.
When Show Advanced Tools is selected in the Advanced preferences pane, the Score Editor can display multiple tracks containing MIDI regions, and display every instrument track in the project.
The Score Editor menu bar includes Layout, Edit, Functions, and View pop-up menus; Display Level, View, MIDI In, MIDI Out, and Catch buttons; Tool menus; and a zoom slider.
The Score inspector, located to the left of the score display, includes the following areas that you use to control various aspects of the score:
Region inspector: Control visual quantization and other display settings for regions in the score.
Event inspector: Control appearance and position settings for individual notes and other items in the score.
Part box: Select notes and other symbols to add to the score.
Inspector channel strips: Control volume, pan, and other mixing functions for the selected track and its output.
You can view the Score Editor in the Logic Pro main window, or as a separate, resizable window.
Do one of the following:
Click a track header, click the Editors button 
in the control bar, then click Score.
Select a MIDI region in the Tracks area, click the Editors button in the control bar, then click Score (or press N).
Double-click a MIDI region (if Logic Pro > Preferences > General > Editing > “Double-clicking a MIDI region opens” is set to Score).
Do one of the following:
Choose Window > Score (or press Command-5).
Drag the Score Editor by its title out of the main window.
Press and hold Option and double-click any event in the Piano Roll Editor.
To show the Score Editor inspector: Choose View > Show Local Inspector from the Score Editor menu bar.
To hide the Score Editor inspector: Choose View > Hide Local Inspector from the Score Editor menu bar.
The following MIDI regions are not displayed in the Score Editor: Muted MIDI regions (if Hide Muted Regions is selected in File > Project Settings > Score Global), MIDI regions on muted tracks (if Hide Muted Tracks is selected in File > Project Settings > Score Global), and MIDI regions for which the Score parameter is turned off in the Region inspector.