Updated ChordSymbol and NoteSymbol

Simple notation for chords and notes in SuperCollider with added frequency methods

Features

• Single-note frequency: .asFreq on symbols (e.g. \\c4.asFreq)
• Single-chord frequencies: .asFreqs on symbols (e.g. \\Cmaj7.asFreqs)
• Note frequencies: .noteProgFreq → returns frequency arrays via .midicps
• Note sequences: .noteProg → returns MIDI note arrays
• Chord frequencies: .chordProgFreqs → returns frequency arrays via .midicps
• Chord progressions: .chordProg → returns MIDI note arrays

Chord Underscore Syntax

Use underscores to specify octave and duration in chord symbols:

1. First underscore (_) → octave (single digit)
2. Second underscore (_) → duration (as fraction numerator/denominator)

Examples:

\\Cm7           // C minor 7 in default octave
\\Cm7_4         // C minor 7 in octave 4
\\Cm7_4_8       // C minor 7 in octave 4, eighth-note duration
\\Cm7__8        // C minor 7 in default octave, eighth-note duration
\\Cm7_d3_4      // C minor 7 over D#, octave 3, quarter-note duration

Inversion is detected when the part after the chord name is not a single digit.

Chord Progressions

MIDI note arrays:

[ \Cm_eb, \Fm, \Gm, \Cm_g, \Cm_eb, \Fm, \Gm_d, \Cm ].chordProg;
[ \C, \G_b, \F_a, \G_b ].chordProg;

Frequency arrays:

[ \Cm_eb, \Fm, \Gm, \Cm_g ].chordProgFreqs;

Note Sequences

MIDI note arrays:

[ \E4, \Fs4, \B4, \Cs5, \D5, \Fs4, \E4, \Cs5, \B4, \Fs4, \D5, \Cs5 ].noteProg;

Frequency arrays:

[ \E4, \Fs4, \B4 ].noteProgFreq;

Traditional Chord & Note Examples

Chords (MIDI degrees):

\C.asNotes               // [0, 4, 7]
\Cmajor.asNotes          // [0, 4, 7]
\CM.asNotes              // [0, 4, 7]
\Cm.asNotes              // [0, 3, 7]
\Em7sharp5flat9.asNotes  // [4, 7, 12, 14, 17]

Sharps and flats:

\Gs.asNotes              // [8, 12, 15]
\Dbmaj11.asNotes         // [1, 5, 8, 12, 15, 18]

Slash/inversions (use underscore instead of slash):

\C_g.asNotes             // [7, 12, 16]
\Fm_gs.asNotes           // [8, 12, 17]
\Dsus4_g.asNotes         // [7, 9, 14]

Degrees in a Scale

\Cmajor.asDegrees                  // [0, 2, 4]
\Cminor.asDegrees                  // [0, 1.1, 4]
\Cmajor.asDegrees(Scale.minor)    // [0, 2.1, 4]
\m7sharp5.asDegrees(Scale.dorian) // [0, 2, 4.1, 6]

[ \Cm_eb, \Fm, \Gm ].chordProgDegrees(Scale.dorian);

Frequency Methods

Single-chord frequencies:

\Cmaj7.asFreqs    // e.g. [261.63, 329.63, 392.00, 493.88]

Single-note frequency:

\c4.asFreq        // e.g. 261.63

Chord progression frequencies:

[ \C, \G, \Am ].chordProgFreqs;

Note progression frequencies:

[ \c4, \e4, \g4 ].noteProgFreq;

Extending Shapes

• List built-in shapes: ChordSymbol.shapes.keys
• Add new shapes: ChordSymbol.shapes.put(\myShape, [0,2,5,7])

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See SuperCollider help for full ChordSymbol and NoteSymbol API details.