You control the app with the space bar, and it works in two different modes depending on whether BPM is set or left empty:

• If you leave BPM empty, pressing the space bar will read out the next note in the sequence, until completion. When the sequence is finished, the timer stops and shows your total time. In other words, press space, find read note's positions on the neck, repeat until timer stops.
• If you set a BPM value, then pressing the space bar sets the timer with the amount of time you have for completing the exercise, and all the notes are read automatically, each one spaced out according to the chosen BPM.

Also, you can click the "New sequence" button to get another selection list.