How to use the st/music.Chord.notes function in st

notesForChord(root, shape, blockStart, blockStop) {
    let maxPitch = this.minPitchInRange(blockStart, blockStop)
    let chordRoot = this.rootBelow(root, maxPitch)
    let chordNotes = Chord.notes(chordRoot, shape)

    if (parseNote(chordNotes[2]) > maxPitch) {
      chordRoot = addInterval(chordRoot, -OCTAVE_SIZE)
      chordNotes = Chord.notes(chordRoot, shape)
    }

    let rate = this.options.rate || 1

    let bpm = this.song.metadata.beatsPerMeasure || 2

    let out = []
    this.inDivisions(blockStart, blockStop, 1 + rate, (start, stop, k) => {
      if (k % bpm == 0) {
        // root on beat
        out.push(
          new SongNote(chordNotes[0], start, stop - start)
        )
      } else {
        // 5 on everything else
        out.push(

it("gets notes for dominant 7 chord", function() {
    expect(Chord.notes("C5", "7")).toEqual([
      "C5", "E5", "G5", "A#5"
    ])

    expect(Chord.notes("C5", "7", 1)).toEqual([
      "E5", "G5", "A#5", "C6"
    ])
  })

it("gets notes for dominant 7 chord", function() {
    expect(Chord.notes("C5", "7")).toEqual([
      "C5", "E5", "G5", "A#5"
    ])

    expect(Chord.notes("C5", "7", 1)).toEqual([
      "E5", "G5", "A#5", "C6"
    ])
  })

it("gets notes for major chord", function() {
    expect(Chord.notes("C5", "M")).toEqual([
      "C5", "E5", "G5"
    ])

    expect(Chord.notes("C5", "M", 1)).toEqual([
      "E5", "G5", "C6"
    ])

    expect(Chord.notes("C5", "M", -1)).toEqual([
      "G4", "C5", "E5"
    ])

    expect(Chord.notes("C5", "M", -2)).toEqual([
      "E4", "G4", "C5"
    ])

    expect(Chord.notes("C5", "M", -3)).toEqual([
      "C4", "E4", "G4"
    ])

  })

it("gets notes for minor chord", function() {
    expect(Chord.notes("C5", "m")).toEqual([
      "C5", "D#5", "G5"
    ])

    expect(Chord.notes("C5", "m", 1)).toEqual([
      "D#5", "G5", "C6"
    ])
  })

it("gets notes for major 7 chord", function() {
    expect(Chord.notes("C5", "M7")).toEqual([
      "C5", "E5", "G5", "B5"
    ])

    expect(Chord.notes("C5", "M7", 1)).toEqual([
      "E5", "G5", "B5", "C6"
    ])

    expect(Chord.notes("C5", "M7", -1)).toEqual([
      "B4", "C5", "E5", "G5"
    ])

    expect(Chord.notes("C5", "M7", -2)).toEqual([
      "G4", "B4", "C5", "E5"
    ])

    expect(Chord.notes("C5", "M7", -3)).toEqual([

it("gets notes for minor 7 flat 5 chord", function() {
    expect(Chord.notes("C5", "m7b5")).toEqual([
      "C5", "D#5", "F#5", "A#5"
    ])
  })

it("gets notes for major chord", function() {
    expect(Chord.notes("C5", "M")).toEqual([
      "C5", "E5", "G5"
    ])

    expect(Chord.notes("C5", "M", 1)).toEqual([
      "E5", "G5", "C6"
    ])

    expect(Chord.notes("C5", "M", -1)).toEqual([
      "G4", "C5", "E5"
    ])

    expect(Chord.notes("C5", "M", -2)).toEqual([
      "E4", "G4", "C5"
    ])

    expect(Chord.notes("C5", "M", -3)).toEqual([
      "C4", "E4", "G4"
    ])

  })

it("gets notes for major 7 chord", function() {
    expect(Chord.notes("C5", "M7")).toEqual([
      "C5", "E5", "G5", "B5"
    ])

    expect(Chord.notes("C5", "M7", 1)).toEqual([
      "E5", "G5", "B5", "C6"
    ])

    expect(Chord.notes("C5", "M7", -1)).toEqual([
      "B4", "C5", "E5", "G5"
    ])

    expect(Chord.notes("C5", "M7", -2)).toEqual([
      "G4", "B4", "C5", "E5"
    ])

    expect(Chord.notes("C5", "M7", -3)).toEqual([
      "E4", "G4", "B4", "C5"
    ])

  })

notesForChord(root, shape, blockStart, blockStop) {
    let maxPitch = this.minPitchInRange(blockStart, blockStop)
    let chordRoot = this.rootBelow(root, maxPitch)
    let chordNotes = Chord.notes(chordRoot, shape)

    let out = []
    this.inDivisions(blockStart, blockStop, 3, (start, stop, k) => {
      let d = (stop - start) / 2

      let one = chordNotes[0]
      let two = chordNotes[2]

      if (parseNote(two) >= maxPitch) {
        one = noteName(parseNote(chordNotes[2]) - 12)
        two = chordNotes[0]
      }

      switch (k) {
        case 0:
          out.push(