Best Embodiment of Atzarin

The best embodiment of Atzarin has intervals on the diagonals ascending from the third row, the one furthest from the hand rail in the case of bandonions and concertinas or the row closest to the bellows in the case of accordions, to the first row, that is nearest to hand rail in the case of bandonions and concertinas and furthest from the bellows on accordions, and the note produced at any button whilst opening the bellows is a semitone higher than the note obtained at the same button whilst closing the bellows.

This produces an arrangement that is most familiar to players of other bisonoric arrangements and enables the most ergonomic, comfortable fingering and chord shapes.