Click the Acapella/Assist toggle button to turn the sound of the piano off or on. Visually, the notes will keep playing and the pitch chart will still measure you. Use this feature when you want to remove the crutch of the piano but still check you are singing correctly, and to check if you remember the notes of a sequence without hearing the piano.
Intervals
These bubbles are the interval between the two notes. For example, the first two notes are F#4 and G4. The interval between them is an ascending minor 2nd (up arrow m2).
