Harmony Box – Free Plugin

Harmony Box (also known as JAEZZESiZER) was created by Mike Massberg and Dave Gamble.

Harmony Box is a MIDI instrument that simulates a modal jazz scale – just press a note, and it will play the corresponding chord!


This plugin is available as a VST or Audio Unit for both Mac and PC. Get it here: Harmony Box download page


  • Chord modes: Major, Dorian, Phrygian, Lydian, Mixolydian, Minor, Locrian.
  • Key selector and volume for root, 3rd, 5th, 7th, 9th, 11th, 13th and 15th notes.
  • Oscillator sync, PWM and shape controls.
  • Envelope DSR.
  • LFO for sync, PWM and shape.
  • Filter resonance control.

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