As requested, references to the hammer/string analysis are listed below: 1. D.E. Hall, Piano string interaction in the case of a small hammer mass. J. Acoustical. Soc. Amer. 79 (1986) 141-147. 2. D.E. Hall, Piano string excitation II: General solution for a hard narrow hammer. J. Acoustical. Soc. Amer. 81 (1987) 535-546. 3. D.E. Hall, Piano string excitation III: General solution for a soft narrow hammer. J. Acoustical. Soc. Amer. 81 (1987) 547-555. 4. D.E. Hall, Piano string excitation IV: The question of missing modes. J. Acoustical. Soc. Amer. 82 (1987) 1913-1918. 5. H. Suzuki, Model analysis of a hammer-string interaction. J. Acoustical. Soc. Amer. 82 (1987) 1145-1151. There are some other papers by Suzuki and colleagues, but there are in Japanese unfortunately. There is also a fifth paper by Hall in the series, but I haven't got that one yet. Stephen Birkett (Fortepianos) Authentic Reproductions of 18th and 19th Century Pianos Waterloo, Ontario, Canada tel: 519-885-2228 fax: 519-763-4686
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