Build the chord denoted by a Roman numeral in a key.
Supports accidentals (bVII, #iv), case-based triad quality, the o/ø/+
suffixes, sevenths (V7, viio7, Imaj7), figured-bass inversions
(V6, V64, V65, V43, V42), and applied/secondary chords via a slash
(V7/V, viio/ii). The target after the slash is read as a scale degree
whose root becomes a local major tonic for the applied chord. Inverted chords
carry a bassPc.
The ø glyph always denotes the half-diminished seventh (iiø == iiø7 ==
m7b5), since no half-diminished triad exists. Extension and added-tone
suffixes are the canonical case-sensitive forms emitted by
chordToRoman and honor the numeral case: V9 -> dom9, ii9 ->
min9, Imaj9 -> maj9, V11 -> 11, V13 -> 13, Iadd6/iadd6 ->
6/min6, I69 -> 6/9, Isus2/Isus4, Iadd9/Iadd11, Ib5 ->
majb5, I5 -> 5, and the altered dominants V7b9/V7#9/V7#11/V7b13.
A figure string that is neither a recognized inversion nor a supported
quality suffix throws rather than silently degrading to a triad.
Build the chord denoted by a Roman numeral in a key.
Supports accidentals (
bVII,#iv), case-based triad quality, theo/ø/+suffixes, sevenths (V7,viio7,Imaj7), figured-bass inversions (V6,V64,V65,V43,V42), and applied/secondary chords via a slash (V7/V,viio/ii). The target after the slash is read as a scale degree whose root becomes a local major tonic for the applied chord. Inverted chords carry abassPc.The
øglyph always denotes the half-diminished seventh (iiø==iiø7==m7b5), since no half-diminished triad exists. Extension and added-tone suffixes are the canonical case-sensitive forms emitted by chordToRoman and honor the numeral case:V9->dom9,ii9->min9,Imaj9->maj9,V11->11,V13->13,Iadd6/iadd6->6/min6,I69->6/9,Isus2/Isus4,Iadd9/Iadd11,Ib5->majb5,I5->5, and the altered dominantsV7b9/V7#9/V7#11/V7b13. A figure string that is neither a recognized inversion nor a supported quality suffix throws rather than silently degrading to a triad.