CG Matter modified his keyboard to a pattern of three white keys and a black key that automatically moves to the next notes ...

The instrument had a brand-new hammer and damper mechanism, two keyboards and a range of four octaves (49 keys). Poet and journalist Scipione Maffei described it in 1711 as a ‘gravicembalo col piano, ...

The expectation is that the keys will react differently to the touch than they do in a regular MIDI keyboard, an organ, or even a stage piano, and feel is often more important than sound.