sentences:  He dealt mainly in Flemish "ravalements" of Ruckers instruments, popular in France at the time; the adaptations to the original harpsichords included knee levers for changing stops, and an enlarged range.In 1778 he advertised a Ruckers ravalement which went as far as 'producing the effect of the Flute, Oboe and Vox humana'.Jacques Germain (variants