What's that button?
What does the AOC or Harmony button do? When should I use it? The AOC (Automatic Organ Computer or Any Old Chord) button or the Harmony button makes the player sound like a pro. Single melody notes on the top keyboard are automatically multiplied so single notes sound rich and full-- like you are playing full chords with both hands. To make it work, you need to press the AOC or Harmony button—it should light up—and play a note on the lower keyboard with MCS or the EZ button o