Louis Couperin
Variations of the standard models were sometimes produced for export to France or England; there are single manual harpsichords with chromatic basses (rather than the short octave) down to C, probably intended for England, and double manual harpsichords with a lower-manual range of GG to c and an upper manual range of F to f, produced for France, the lower manual being at standard pitch and the upper a 4th below, reversing the usual pitch arrangement. The lower manual range of these instruments suits the music of contemporary French harpsichord composers such as Chambonnières and Louis Couperin, while the upper manual range is close to early French organ design.