This is a exercise based on lesson files. You can define lesson files to practise intervals or chords, almost like the real chord and interval exercises. Or the lesson file can show you a list of harmonic progressions and you must click on the button representing the one played. Or Solfege play some music from the selected lesson file and the user must tell if the music is in major or minor key.
Some lesson files contain documentation that is availabe from the config page of the exercise where you also select the lesson file to use.