You can mute individual notes in the Piano Roll Editor, letting you experiment with different note choices in a melody, or different chord voicings, for example.
In the Piano Roll Editor menu bar, tap the Trim button 
.
Tap the note to select it, or select multiple notes.
Tap the Inspector button 
on the left side of the view control bar (or press I on your external keyboard) to open the Note inspector.
Tap the Details disclosure arrow to show the Details parameters, and then tap the Mute switch to mute or unmute the selected notes.
Muted notes turn gray.
In the Piano Roll Editor menu bar, tap the Trim button .
Tap the background of a region to deselect any selected notes, then tap again and choose Select Muted Notes from the menu.
In the Notes inspector, tap the Mute switch.
You can quickly delete all muted notes if you decide you don’t need those notes in your arrangement.
In the Piano Roll Editor menu bar, tap the Trim button .
Tap the background of a region to deselect any selected notes, then tap again and choose Select Muted Notes from the menu.
Tap a selected note and choose Delete from the menu.
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