A list the the intervals to ask for. The intervals are written in a short form, a letter and a number, like d5 or m7. The letters are telling the interval quality are 'd' for diminished, 'a' for augmented, 'm' for minor, 'M' for major and 'p' for perfect.

This variable sets the range of tones that can be used when constructing the intervals. The note names as to be quoted. The default value is "b", "g''". Example:

tones = "c'", "f''"  # valid
tones = c', f''      # not valid

This variable defines how many accidentals the tones making the interval can have. The value 0 means no accidentals, 1 means that flats and sharps are allowed, and 2 means that double flats and double sharps are allowed. The default value is 1. Example:

accidentals = 2

Set which clef to use. The default value is violin. Possible values: violin, treble, subbass, bass, baritone, varbaritone, tenor, alto, mezzosoprano and french. Example:

clef = bass