Here is a minimal lesson file:
element progI { label = "I" }
element progIV { label = "IV" }
element progV { label = "V" }
header {
module = elembuilder
title = "progression test"
elements = auto
# uncomment if you want a music displayer.
# have_music_displayer = yes
}
question {
music = rvoice("<c' e g> <b d g> <c e g>")
elements = progI, progV, progI
name = "I-V-I"
}
question {
music = rvoice("<c' e g> <c f a> <c e g>")
elements = progI, progIV, progI
name = "I-IV-I"
}
This block defines the elements the user can put together to answer the
question. Each block is named by the string between element
and {. The block defines one variable,
label that is the label the button will get.
labellabel can either be a plain string or one
of the label functions.
sortIf defined, the value of sort will be used
to sort the elements when displaying the buttons. If not defined,
the elements will be sorted by their name.
elementsThis variable defines which elements to display. Set this to auto to display all elements that are needed to answer the questions in the lesson file. You can display more elements that needed to make it more difficult for the user. An example:
elements = progI, progIV, progV, progIV, progV_6
music_displayer_stafflinesSet this if you want the music displayer to show more than one empty staff line when the music displayer have no music to display.
See also at_question_start and music_displayer_stafflines.
elementsThis variable defines which elements defines the question. It can be elements, as defined in the example above, or strings or labels defined by the label functions.
tonicThe exercise will have a "Play tonic" button if this variable is defined in a question in the lesson file. The variable should contain some music to play to the user so that he knows the tonic of the question. This can be useful in harmonic progressions that does not start on the tonic. This variable is optional. Example:
tonic = chord("c e g")nameThe name is needed for storing statistics. A string or a label created by the label functions.
See also vmusic.