Known chord types

• C, C6, C69, C7, C9
• Cmaj7, Cmaj9, CmM7
• C7sus, Csus2, Csus4
• Cm, Cm6, Cm69, Cm7, Cm9, Cm7b5
• C7#5, C7#9, C7b5, C7b9
• Cadd2, Cadd9
• Caug, Caug7
• Cdim, Cdim7

No MIDI will be created for progressions with unknown chords

Some chords will be changed

• Inversions are ignored (Am/E → Am)
• '#11' chords are voiced as '#5' (Bb7#11 → Bb7b5)
• 'alt' chords are voiced as 'b9' (G7alt → G7b9)
• '11' chords are changed to '9' chords without a 5 (Ebm11 → Ebm9(no5))
• '13' chords are changed to '9' chords without a 5 (Bb13 → Bb9(no5))