You will hear two pitches: C5 and a pitch between C#5 and C6. You have to set the second sound pitch making it sound like the first with the sliders. You will see your result in cent (semitone = 100 cent). You can also decide to tune an interval instead of the unison. There is a Tutor mode that you can use to see in real time the pitches of the two sounds. Good work and have fun! Antonio Lanciotti and Andrea Strappa