The race was also on to make the harpsichord’s sound more pleasing. Jakob Adlung, in his Musica Mechanica Organoedi of 1768, declared that harpsichord quills of goose feathers were too soft to produce a good tone, those made of fish bones too stiff, but that raven feathers coated with olive oil were just right. The Parisian instrument builder Pascal Taskin simply used leather quills to produce a “rounder” sound. Bach’s biographer Johann Nikolaus Forkel mentioned an instrument built in Rome that went Taskin one better: it used quills of leather covered with velvet. “These pieces,” he declared, “sound as if softly touched by a sensitive finger and produce a tone combining the sound of a flute with that of a soft bell. In its fine quality of sound this instrument easily surpasses all others.”