The dulciola that Washington Phillips played DOES have a piano keyboard attatched. The Patons have one at Folk Legacy. I know 'cause I've photographed it there. But the pianolin was made by a fellow in Michigan. I think his name was Marx. Claudia Schmidt played several of his strange inventions.

The pianolin had hammers on tempered wires over the strings. These could be bent downward & used to hammer a string sort o' like a hammered dulcimer. Might be wrong though.