This has been an interesting topic. As I have been a builder, I will 
offer my perspective. I only go through the ghosting process when I am 
equipping a whole register with new jacks or all new plectra. I adjust 
the register to what I think is a safe "off" position (the backs of all 
the jacks not interfering with any strings behind them). I then move the 
register _very_ slightly toward the "on" position and lock it in 
position using the capstan screws at both ends.

With the register fixed, I ghost all the plectra one after the other. I 
will allow some tiny variation in the volume of the ghost sound but I 
never permit it to be strong. I always cut the plectrum with the proper 
bevel cut at its tip to shorten it. I have found that if I cut a 45° 
(estimate) bevel but I am close to perfect ghosting but a tiny bit too 
strong, I can improve the ghost tone by the expedient of steepening the 
angle of the bevel slightly. This allows some fine tuning without 
risking the previous work. When the entire register is finished, I can 
be sure that the "off" position will be silent and that I have the full 
plectrum length available for voicing. I never adjust plectrum length 
again. As to how one acquires the skill to ghost well, I have two 
comments: 1) it is never "easy" but can be adequately mastered and 2) 
practise, practise, practise.

I never ghost as part of doing modest repairs, such as replacing and 
voicing individual plectra. When replacing a plectrum, I cut the 
plectrum to a length and shape that apes its immediate neighbors as 
closely as I can. By length, I mean the amount of extension beyond its 
string when the register is "on" as that of its neighbors. It should 
then be "off" when its neighbors are "off" and if shaped (plan view) the 
same, should provide a good starting point for voicing.

Good luck!

Rob

-- 
ROBERT BROOKE HARPSICHORDS
4214 18th Ave W
Bradenton, FL 34205

www.robertbrookeharpsichords.com

941-746-6725


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