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Use the Arpeggiator in GarageBand on Mac
You can use the Arpeggiator on software instrument tracks. When you turn on the Arpeggiator, chords you play on the keyboard are arpeggiated, or played one note at a time rather than simultaneously.
After you turn on the Arpeggiator, the Arpeggiator pop-up menu appears in the menu bar. You can choose an Arpeggiator preset and adjust Arpeggiator settings, including note order, note range, and octave range from the Arpeggiator pop-up menu.