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