Sorry, I cannot supply instructions for the French Double Harpsichord.
For most enthusiasts, the two-manual instrument is the Rolls Royce harpsichord. It does, however, involve more work and it would be a very ambitious project for a first time builder.
The French Double Kit has two 8' registers, one 4' and a buff stop. The most commonly used registrations are:
Lower manual 8' Lower manual 8' with buff Upper manual 8' Manuals coupled 8' + 8' Manuals coupled 8' + 8' + 4'
The ability to change rapidly from upper to lower manual is very useful in accompanying and is necessary for a proper rendering of works like Bach's "Italian Concerto". By moving the keyboard, the instrument can be made to play at baroque pitch or modern pitch.
Hear the French Double
|A single 8' stop|
|Full instrument (2 x 8', 1 x 4') (1 x 8' at end)|
|The buff stop|