Drawbacks of Conventional Bisonoric Instruments

The bisonoric layouts described so far are not neutral, which means they have several drawbacks.

For a start the musical interval between buttons that have the same spacing between them is not regular throughout the keyboard. For example, between the notes at adjacent buttons in the same row there is sometimes an interval of two whole tones, which is a Major Third (3M), but at other places in the same row the interval between adjacent buttons is a whole tone plus a semitone, which is a Minor Third (3m), two whole tones plus a semitone, which is a Perfect Fifth (5P), or even just one whole tone, which is a Major Second (2M).

On top of that, the musical interval between the note obtained at a button closing the bellows and the note obtained at the same button opening the bellows is different at different buttons, being a whole tone at some buttons but a semitone at others.

Moreover, the notes obtained opening the bellows are all displaced one button to the right in relation to the notes obtained closing the bellows in each change of octave.

These irregularities are simply a burden on the memory and make the learning process more difficult and slower.

Transposing to musical keys other than the home keys of the instrument is more difficult and those keys not strictly related to the home keys are practically impossible. Even in the different home keys of the instrument the execution of the same piece of music cannot be the same, which means that learning the same piece in different keys is like learning two different pieces of music.