The chord module

The chord module let you identify different properties of chords, such as their name, inversion, top tone etc.

The properties are defined by the props variable in the lesson file header, and there should be a variable prop_labels that defines the label to use. props and prop_labels must be lists of equal length. You only have to define these two variables if you need other properties than the default ones: name, inversion and toptone.

Below is a minimal lesson file. It will create an exercise that will play a minor or major chord and the user answers with two buttons labeled "Minor" and "Major" and two buttons representing the inversion. Notice that unused properties, toptone in this example, are hidden.

header {
    module = chord
    title = "Minor and major chords"
    lesson_id = "e263d40a-d8ff-4000-a7f2-c02ba087bf72"
    qprops = "name", "inversion", "toptone"
    qprop_labels = _("Chord type"), _("Inversion"), _("Toptone")
}
question {
  name = "Major"
  music = chord("c' e' g'")
  inversion = 0
}
question {
  name = "Minor"
  music = chord("es' g' c''")
  inversion = 1
}

The inversion property is special. If assigned integer values, like in the example, the integer values will be replaced with strings. So 0 is replaced with "root position", 1 with "1. inversion" etc.