D
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A stepped keyboard in the bass (the first 2 rows stepped ) seems to be a good compromise to this left thumb problem, as seen in this Scarlatti piece:
Øivind Farmen plays Sonata in A major (K. 24) by Domenico Scarlatti
For PA, the Soprani-Luttbeg system has been tried
Luttbeg Accordion
http://squeezyboy.blogs.com/squeezytunes/2008/03/black-luttbeg-s.html
In the 1950s French maker Maugein tried this example (Boîte daccordéons):
http://bandonion.info/solo,hybrid.htm#
The Gabla-Geuns hybrid bandoneon was based on this 1950s model.
Giovanni Gagliardi also tried some free bass models with lateral basses, he like to play Bach on his fisarmonica.
http://www.giovannigagliardi.net/Galleria.html
Øivind Farmen plays Sonata in A major (K. 24) by Domenico Scarlatti
For PA, the Soprani-Luttbeg system has been tried
Luttbeg Accordion
http://squeezyboy.blogs.com/squeezytunes/2008/03/black-luttbeg-s.html
In the 1950s French maker Maugein tried this example (Boîte daccordéons):
http://bandonion.info/solo,hybrid.htm#
The Gabla-Geuns hybrid bandoneon was based on this 1950s model.
Giovanni Gagliardi also tried some free bass models with lateral basses, he like to play Bach on his fisarmonica.
http://www.giovannigagliardi.net/Galleria.html