Gracious - I seem to be writin' a lot.
Joseph mentions the Tilney disc with the undamped 4'. REminds me
that one of my first big harpsichord-related projects, two lifetimes
ago, was for Meg Irwin-Brandon, who complained that her early
Huddard double, with the heavy jacks and glued-on leather dampers,
damped _too well._ Later she insisted that the most important
difference between hpschd and early piano was that the latter had
better dampers than the former!
Usually, it seems to me, the geometry of the 4' strings almost
forces the dampers off the strings when the register's off. Otherwise,
one has to work with imossibly short 4' quills. Doesn't seem to
me that that's ever represented a real problem.