This exercise is one of the exercises you can use to practise intervals. The concept is pretty simple: You press the ''New interval'' button to play a random interval, and then you should tell what interval it was.
If you are using the buttons interface, then you can right-click on the buttons to hear the interval they represent.
On the config page of the exercise, there is a combo box where you can select different ways to answer the question. Currently there is a piano, guitar, bass and a few types of accordion in addition to the default buttons interface. Below is a screenshot showing the piano interface.
New interval: Alt-n
Repeat: Alt-r
Repeat melodic: Alt-m
Give up: Alt-g
Minor second: 1 | Perfect fourth: 2 | Major sixth: 3 | Minor ninth: 4 |
Major second: q | Tritone: w | Minor seventh: e | Major ninth: r |
Minor third: a | Perfect fifth: s | Major seventh: d | Minor decim: f |
Major third: z | Minor sixth: x | Perfect octave: c | Major decim: v |