bug fix
336 chords for guitar: natural, sharp, flat, major, minor...
C, C# or Db, D, D# or Eb, E, F, F# or Gb, G, G# or Ab, A, A# or Bb, B
maj, 5, 6, 7, maj5, 9, maj9, 11, 13, maj13, min, m6, m7, m9, m11, m13, m(maj7), sus2, sus4, dim, aug, 6/9, 7sus4, 7b5, 7b9, 9sus4, add9, aug9
