Publisher: Sonus Paradisi Website: Sonus Paradisi Format: HAUPTWERK Quality: 24 bit 48 kHz stereo What is Cembalo Ruckers Model? Two hand dulcimers were designed from a model by John Rückers of 1624, which is housed in the Unterlinden Museum (formerly owned by the de Sade family and kept at the Château de Condé, Condé-en-Brie).