Metal chord instruments like pianos with “prolonged notes” like the harmoniums. They have levers to deaden the sound and were highly appreciated for their elegance and fine harmonies. The Queen Mother Margaret of Savoy had one. In preparing the expedition to the North Pole in 1899 the Duke D’Abruzzi insisted there was a Racca Melodeon on board the “Stella Polare”.

“Racca” Melodeon – late 1800