Wicki-Hayden note layout

The Wicki - Hayden system is a system for the arrangement of keys on keyboard instruments. The Wicki - Hayden keyboard offers several advantages over the prior art keyboard systems. Through their shifted 6 -plus -6- arrangement applies to all keys the same fingering where the size of keys allows. In addition, the keys of the diatonic scale are very close together. It alternate rows from the first three tones with the fourth to seventh notes of the scale.

Use is the Wicki - Hayden keyboard at the Hayden Duet concertina. Also, once a Hayden bandoneon was made.