Manoury unisonoric bandoneon left hand keyboard layout

The unisonoric bandoneon is, undoubtedly easier to learn than the bisonoric bandoneon, but does inherit the uncomfortable, cramped fingering style of the international chromatic system and has a split personality, having an isomorphic, regular nucleus of 3 rows based on the international chromatic system, as found on accordions, coupled with an irregular, non-isomorphic extension, which is a hinderance to rapid learning.

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.