The method relates to the mathematical relationship between the string and the associated striking hammer, taking into account the "groups of strings" with 1, 2 or 3 strings per key and ensures uniform playability of the entire instrument and the same striking gives the same loudness and sound volume. The calculation for strings and hammers is based on analysis of commercially available instruments, the irregularities of which, in particular during transitions between groups of strings, have been recognised with the mathematical analysis methods applied and opened the way to relationships between string and hammer, which are described in the invention. The hammerweights are in most cases better balanced than the tractive force of the strings. The invention relates only to the overall excitation system for production of the sounds but does not go into the resonance system dependent thereon.
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