I wrote a piece that demonstrates the three distinct sounds of the GPO harpsichord. It's as though the harpsichord dude or dudette is playing an instrument with three manuals. I believe that a three-manual harpsichord actually existed in the eighteenth and nineteenth centuries. It was scarce and very expensive.
I believe I may even have seen pictures somewhere of a
four-manual harpsichord, Larry. With all that string tension,
one wonders how some of the larger ones -- made solely of
wood, then, for structural elements -- even held together.
An excellent demonstration -- and an excellent piece; the
contrast of manuals really "makes" it. Some tasty, delicious
harpsichord sounds in this; the relatively light voicing is
superb, quite reminiscent of some of the earlier (more lightly
built) historic instruments I've heard.