Chord quality from its intervals: 'maj7', 'm7', '7', 'dim7', 'm7b5',
'mM7', 'aug7', 'augM7', 'aug', 'dim', '7sus4', 'sus2', 'sus4', 'm', 'M', or
'' when none fits. A tuning without 12 steps per octave is read through the 12-TET notes
its steps stand for (Chord.retune); '' when one stands for none. Ninths, elevenths and sixths
reduce to the triad or seventh below them (Cadd9 and C6/9 are 'M'); a chord is sus only
without a third.
Chord quality from its intervals:
'maj7','m7','7','dim7','m7b5','mM7','aug7','augM7','aug','dim','7sus4','sus2','sus4','m','M', or''when none fits. A tuning without 12 steps per octave is read through the 12-TET notes its steps stand for (Chord.retune);''when one stands for none. Ninths, elevenths and sixths reduce to the triad or seventh below them (Cadd9 and C6/9 are'M'); a chord is sus only without a third.