| The 48 buttons are placed on four rows, of which the two central ones are the diatonic scale. |
| The fingering indicated is performed easily by a student with modest hand size and capitalizes on diatonic scale patterns. |
| The modulator work must now include free leaps to and from any tone of the major diatonic scale. |
| Harmonically, the added notes are needed to provide a major or minor triad for each note of the diatonic scale. |
| In tonal music the intervals between the successive pitches are not literally replicated but become the equivalents within the diatonic scale. |
| All three were normally diatonic only, though players could raise the pitch by a semitone by stopping a string near the neck. |
