Increase note range

[andrestelex]

Some of the lower and higher notes (for example, in typical guitar partitures) are missing. The lowest note for treble is A, while usual guitar musice will use down to E, or lower (D or C#). For the bass, something similar happens with the piano. Low notes are impossible to be practiced (anything below C). I found the application incredibly good to learn the bass clef, but once I did it, I'm finding hard to understand low notes since I'm not able to try them.