Bisonoric bandoneon left hand draw notes.

The bisonoric bandoneon keyboard layout seems chaotic and illogical, despite supposedly being arranged in tonal areas. Most agree in highlighting the great difficulty in learning four keyboard arrangements, as they are different on each hand depending on the bellows' direction and the left and right hand arrangements are also completely different from each other. The task of memorisation of scales patterns, chord shapes, arpeggios etc is huge as they are all different in each musical key.

If you like the bandoneon and want to learn quickly and easily on a fully chromatic, completely regular, isomorphic layout that will let you play in any key with similar ease, you should definitely think about getting an Atzarin bandonion.