Fred, You are right about interaction in the piano. Everything in the piano's acoustic system interacts with everything else. Whether or not tuning the piano will make the overall inharmonicity of individual strings be lower, I'm not so sure. But of one thing I am sure. When I was doing my experiments with longitudinal modes and their coupling to and from transverse modes, I found it impossible to get conclusive results from a real piano. There were just too many things interacting all at the same time. When I started using a long monochord with lots of mass, rigid terminations, and separate transducers for transverse and longitudinal vibrations, I was able to sort it out. Jim Ellis
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