Jake Johnson wrote:

The effects, too--a little more reverb with a little more velocity? On the electric pianos, a little more, or less, flanger with increased velocity?)

Effects aren't polyphonic, that wouldn't work well.

I'm pausing over why an effect would need to be polyphonic for its depth to be modulated by velocity. You're thinking of playing a chord, with some notes hit harder than others? The program cannot apply varying degrees of reverb, say, to each note, but must instead apply the same amount of reverb to each note?

The effects, too--a little more reverb with a little more velocity? On the electric pianos, a little more, or less, flanger with increased velocity?)

Effects aren't polyphonic, that wouldn't work well.

Regardless, on the harpsichord, the Duplex sounds good with your assignment to the foot controller.

If you like to simulate some semblance of the faux dynamics effect that you’re after, you can maybe try increasing the Duplex parameter at high velocities and decreasing it at low velocities.
And if you automate the Duplex-parameter with, say, a foot-controller, you don’t even have to program those faux dynamics afterwards, like I had to do in the following example (where the Duplex is controlled by the modwheel). The effect is grossly and tastelessly exaggerated in this very quickly made example, but it’s just to illustrate the trick:

http://users.telenet.be/re-peat/Cembalo_ModDuplex.mp3

It would be easier of course if the Duplex parameter could be set to be modulated by velocity, but that is not an option at the moment.

Not sure of the sound of the increased Duplex-parameter is the sort of thing you’re looking for, but to my ears it does sound suggestive of a bit more body resonance.

_

Good physical copies of original harpsichords have a great deal of resonance: thsi is reproduced reasonably faithfully with good sampling or modelling.

I once suggested a option to hammer harpsichords strings and to pluck the piano strings.