Custom MIDI Auto-Harmonizer is designed for composers and live performers who want to enrich their music with real-time harmonized notes based on the chord being played. By specifying the scale of the current chord, the tool generates harmonies automatically, allowing users to define their own harmonization tables to meet specific musical needs. This flexibility ensures that harmonies remain musically appropriate and tailored to the artist's style.

The tool offers comprehensive control over incoming note parameters, such as holding the last detected chord to maintain harmonization even when chords are released, and options to manage the output of original notes from both right and left hands. It can also correct harmonized notes when chord changes occur, ensuring seamless transitions. These features make it possible to maintain harmonic consistency during dynamic performances or complex compositions.

Custom MIDI Auto-Harmonizer supports detailed auto-harmonizing settings, including the split point between left and right hand input, channel processing options, and velocity adjustments for harmonized notes. Users can create layered harmonies by stacking multiple instances of the plugin, allowing for rich, multi-layered harmonic textures. This makes it a powerful tool for crafting intricate harmonic arrangements that respond dynamically to live playing.