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This is still a typically stringed piano, just with felt added to dampen the other strings, I believe. The webpage describes an Una Corda piano built with only

This is still a typically stringed piano, just with felt added to dampen the other strings, I believe. The webpage describes an Una Corda piano built with only one string

misthop 8y ago
One string per note (as opposed to the usual 1/2/3 depending on where in on the keyboard you are talking about), not only one string. The video the parent linked to is the Una Corda - played by the designer/builder