ChordEase lets you play music with difficult chords easily on any MIDI instrument.
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README.md

README.md

Play hard chords easily.

ChordEase makes it easier to improvise over complicated chord progressions. No matter what the chords are, you can play as if they were all in the key of C. You don't need to play sharps or flats, because ChordEase automatically adds them for you. Though ChordEase is intended for jazz, it could be useful for any type of music that modulates frequently. ChordEase alters your notes in real time in order to make them harmonically correct, while preserving their rhythm and dynamics. By delegating rapid music theory calculations to ChordEase, you gain freedom to concentrate on other aspects of improvisation and performance, such as feel and aesthetics.

ChordEase is a translator that takes MIDI notes as input, and produces MIDI notes as output. The input notes are mapped to the current chord scale, so that the output notes fit the chord progression of a song. ChordEase supports various mapping functions which determine how the translating is done. ChordEase can handle multiple translations at once, so multiple performers can play through a single instance of ChordEase, using any number of MIDI instruments. ChordEase parameters can be remotely controlled via MIDI for additional effects. ChordEase can also record its own output as MIDI data.