The bercandoneon makers are experimenting
The bercandoneon, a sort of free bass piano accordion, invented in the 1880s.
Bercandoneon is just one of the many names that has been given to the free bass PA.
(the bercandoneon starts at 0'45'')

This one has a new device to rest on both knees. (don't know if the women will pick up this "instrument" to play on stage or in public...)
(How to perform fast bellows changes with this? With fast bellows shakes it could get become a real nut cracker. )

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