| const romanChordMapping = { i: 0, ii: 1, iii: 2, iv: 3, v: 4, vi: 5, vii: 6 } | |
| register('romanChord', function (scaleName, pat) { | |
| return pat.as("roman:chordSuffix").fmap(({ roman, chordSuffix}) => { | |
| const lower = roman.toLowerCase(); | |
| return n(romanChordMapping[lower]).scale(scaleName).fmap(value => { | |
| return value.note.slice(0, -1) + (roman == lower ? 'm' : '') + (chordSuffix || ''); | |
| }).chord(); | |
| }).outerJoin(); | |
| }); |
"<I V vi iii IV I IV V>".romanChord("d:major").voicing().sound("piano")"<i:7 [VI:sus VI:9] III:7 [VI VI:7b5]>".romanChord("a:minor").voicing().sound("gm_epiano1")Lowercase Roman numerals will append "m" to the root note name, which could cause some voicings to not match (e.g., "vi:sus"). In these cases, use uppercase Roman numerals (e.g., "VI:sus").