International Chromatic C System Left Hand Layout

The chromatic layout is an excellent arrangement on 5 and even 4 rows of buttons, although this greatly increases the size of the instrument. However 3 and even 4 row keyboards using the chromatic layout are rather more limited than a 3 row Atzarin layout.

The biggest drawback of the international chromatic layout is its uncomfortable, cramped fingering style which often requires crossing fingers, as well as an unnatural wrist position. It is completely alien for players of diatonic accordions or bisonoric bandonions and is probably not the best choice to "upgrade" from a diatonic to a chromatic instrument nor from a bisonoric, non-isomorphic instrument to an isomorphic one.