Evenness at ppp is of supreme importance to pianists. It makes the keyboard feel secure and "friendly." The effect is not subtle, but achieving it seems to be a black art. I don't know the answer either, but here's my two cents. First let's assume that touchweight, friction, repetition spring tension, let-off, and knuckle position and condition are already reasonably uniform or smoothly graduated. Find the amount of weight that, when released on the key top, just causes the string to sound. Hold the key up with a finger on the key end (or side for black keys), position the weight on the key, then pull the finger away suddenly. Easy and repeatable. No "touch" involved. Since touchweights and and friction are known to be even, everything must be uniform until the jack toe strikes the let-off button. The only things that happen after this point and before sound are 1) the jack tip escapes from under the knuckle, and 2) slight compression of the repetition spring. We know it's not the rep springs, so the only possible culprit is jack-to-knuckle friction. Since the knuckles are in uniform condition, the only adjustment that is relevant and available is jack-to-knuckle alignment. Adjust it so each key just sounds with an equal amount (or a smooth progression) of weight. If any keys cheat, increase the weight a bit and repeat. Comments? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100126/7a6dd31c/attachment-0001.htm>
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