Question: What is MIDI Notes mode Answer: Some units have a harmony style called MIDI Notes mode. When you use this mode in combination with a MIDI input such as a keyboard connected with a 5-pin MIDI cable, or Midi notes from a DAW sent by USB, you can play exactly the notes you would like to hear as harmonies, and the unit in question will create a MIDI harmony voice based on your lead voice! This is great if you know exactly what harmony voicings you want, or if you are already harmonies with someone else doing lead, and you want to add more harmony voices!