From here, you can perfect note length, velocity, pitch and timing with the onboard editing tools. Yet MIDI editing isn’t reserved just for parts you’ve played in yourself – you can also use the techniques outlined here to personalise parts generated by GarageBand’s Smart Instruments or any of the MIDI-based Apple Loops found in the bundled library. Here’s how it all works in nine simple steps.
1 Record some MIDI
You can record anything you like by using one of GarageBand’s built-in instruments. Alternatively, drag in a MIDI-based Apple Loop from the loop library.
2 Enter Edit mode
Enter Track view by tapping its icon in the control bar, then double-tap your MIDI region to bring up a palette of several options. Tap the Edit option, over on the right.
3 Move notes
Just tap and hold a note to move it around. Drag vertically up or down to adjust its pitch and horizontally to move it to a new time position in the grid.
4 Change note lengths
To change a note’s duration, tap to select it and drag the small white arrows to set the correct length. A white vertical line indicates where the new end of the note will be.
5 Delete notes
To delete a note, tap to select it and a pop- up menu will appear. Tap Cut to remove the note and copy it to the clipboard, or Delete to remove it altogether.
Tap the Velocity option in the pop-up menu and a velocity slider appears. Slide this to the right to increase the loudness of the selected note, or to the left to make the note softer.
7 Add notes
Hold the pen button in the top-left corner until it turns red and you can tap anywhere to add (and also delete) notes. Slide the button to the right to lock it for hands-free operation
8 Select multiple notes
Tap and hold in an empty area of the note editor background until a selection rectangle appears beneath your fingertip. Drag this around the set of notes you want to select.
9 Edit multiple notes
With multiple notes selected, tap any one of them to reveal the pop-up menu. The Cut, Copy and Delete functions will now apply to all selected notes.
Click Image to Enlarge: