My three fingers and the thumb all require different lengths. Adjust the fingers first for feel. so I make an accurate strike, and second for tone. Or the reverse might do better. I want the best tone I can accurately make.
The thumb I adjust so I can use the nail versus flesh in varying degrees by moving my wrist in and out a bit.
So, ultimately it is the tone you wish to produce. In my case that is the warmth of the flesh with some brightness from the nails.
The great ones can adjust these matters throughout the piece to achieve the interpretation they require. - Steve
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