New features
- Add new chord classification: 'sus' for "suspended chord" (sus4 and sus2)
Improve
- Split 'diminished' chord classification into:
- diminished (triad or tetrad)
- half-diminished (tetrad)
- whole-diminished (tetrad)
Fix
- Fix special dyads interval classifications. Exemple: [A4, Cbb5] as +d3
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