What the piano roll is and why you need it

The piano roll is the main window where you write and edit individual notes in Logic Pro. It shows time running left to right along the top, and musical pitch running bottom to top on the left side — like a piano keyboard turned sideways. When you open it, you can see every note you've recorded or created, click to add new notes, drag them to different pitches or timing, and adjust their length. Without the piano roll open, you're working blind when you need to fix a single note or build a melody from scratch.

Logic starts you in the arrange window by default, which shows your tracks as horizontal bars. The piano roll lives inside a separate editor that you have to open deliberately. Most people need it within seconds of starting work, so knowing the fastest way to get there saves real time.

Key Takeaways

  • Double-click any MIDI region (a colored block on a track) to open the piano roll editor for that track.
  • You can also select a region and press Enter, or go to the View menu and choose Piano Roll.
  • The piano roll shows notes as horizontal bars — their left edge is when they start, their right edge is when they end, and their vertical position is their pitch.
  • The piano roll and arrange window stay open at the same time; closing one does not close the other.

The fastest way: double-click the MIDI region

Open the arrange window and look at your MIDI tracks — you'll see colored rectangular blocks. Each block is a region, and it contains the notes you've recorded or created. Double-click any of these blocks, and Logic opens the piano roll editor showing all the notes inside that region.

This is the method most people use because it's the quickest and most direct. You see the region you want to edit, you double-click it, and the piano roll appears. If you have multiple MIDI regions on the same track, double-clicking one opens the piano roll for just that region — you can only edit one region at a time in the piano roll.

Using the keyboard shortcut

If you've already selected a MIDI region in the arrange window, press Enter on your keyboard. Logic opens the piano roll for that region when ready. This is faster than moving your mouse to double-click, especially if you're working through many regions in sequence.

Make sure you're pressing the main Enter key, not the one on the numeric keypad — Logic treats them differently depending on your settings. If nothing happens, check that a MIDI region is actually selected (it should have a white border around it in the arrange window).

Opening the piano roll from the View menu

Click the View menu at the top of Logic, then look for Piano Roll in the list. Select it, and the piano roll opens. This method works even if you haven't selected a region yet — Logic will show you an empty piano roll, and you can then select which region to edit from a dropdown menu inside the editor.

This route is slower than double-clicking, but it's useful if you're new to Logic and want to explore the menu structure, or if you're having trouble getting the double-click method to work.

Understanding what you're looking at in the piano roll

Once the piano roll is open, you'll see a grid. The horizontal lines represent musical pitches — C, D, E, F, and so on — and they're labeled on the left side. The vertical lines represent time, measured in beats or bars depending on your zoom level. Notes appear as horizontal colored bars: the left edge shows when the note starts, the right edge shows when it ends, and the vertical position shows the pitch.

At the top of the piano roll is a ruler showing time. Below that is a keyboard icon on the left side showing the pitch range. You can scroll up and down to see higher or lower notes, and scroll left and right to move through time. The piano roll is not a separate window floating on top — it usually replaces the arrange window or sits below it, depending on your layout.

Switching between the arrange window and piano roll

Logic can show both the arrange window and the piano roll at the same time, or just one. If you want to see both, look at the tabs or buttons at the top of the editor area — you may see tabs labeled Arrange and Piano Roll, or buttons that let you switch between them. Click the one you want to view.

If you only see one editor, you can split the screen by dragging the divider between sections, or you can use the View menu to change the layout. The arrange window and piano roll are not competing for space — they're two different views of the same data, and you can arrange them however works best for your workflow.

Closing the piano roll when you're done

When you finish editing notes in the piano roll, you don't have to close it. You can click back to the arrange window to see the full picture of your song, or you can leave the piano roll open and select a different region to edit. Closing the piano roll doesn't delete your work — all the notes you created or edited stay in the region.

If you want to close the piano roll and return to the arrange window only, look for a close button (usually an X) on the piano roll tab or panel, or use the View menu to switch layouts. The choice is yours depending on what you're working on next.

Frequently Asked Questions

Why do I see an empty piano roll when I open it?

You probably opened the piano roll without selecting a MIDI region first. Click on a colored region in the arrange window to select it, then double-click it to open the piano roll for that region. If you opened the piano roll from the View menu, look for a dropdown at the top of the editor that lets you choose which region to view.

Can I edit multiple MIDI regions at once in the piano roll?

No. The piano roll shows one region at a time. If you need to edit notes across multiple regions, you can either edit them one region at a time, or combine the regions into one by selecting them in the arrange window and using the menu option to merge or combine them.

What if the piano roll opens but I can't see any notes?

The notes might be outside the visible area. Try pressing Ctrl+A (or Cmd+A on Mac) to select all notes in the region, then press Z to zoom to fit. This centers the view on all your notes. You can also scroll up, down, left, and right using the scroll bars or arrow keys to hunt for them.

Is there a difference between the piano roll and the score editor?

Yes. The piano roll shows notes as horizontal bars on a grid, which is fast for editing timing and pitch. The score editor shows notes as traditional sheet music notation. Both edit the same MIDI data — you can switch between them without losing work. Open the score editor from the View menu if you prefer reading standard notation.