<HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"= > <META content="MSHTML 6.00.2800.1458" name=GENERATOR></HEAD> <BODY style="MARGIN: 4px 4px 1px; FONT: 10pt Tahoma"> <DIV>I believe in the last decade or two, luthiers have been</DIV> <DIV>using transducers at certain frequencies to</DIV> <DIV>adjust plate resonance. They also use "plate tapping"</DIV> <DIV>to find areas that need scraping. This is more</DIV> <DIV>common w/violins, violas,cellos, basses than guitars</DIV> <DIV>I think, but maybe they do it also.</DIV> <DIV> </DIV> <DIV>At one time, Schimmel (I was told) was doing this</DIV> <DIV>to shape their sound boards. (Though you'd never</DIV> <DIV>know if from the new 7' I tuned last weekend!)....</DIV> <DIV> </DIV> <DIV>Perhaps all the piano mfgs are using transducers for</DIV> <DIV>analysis  now? I wonder if Overspianos has done this.</DIV> <DIV> </DIV> <DIV>If they are not they should.</DIV> <DIV> </DIV> <DIV>The strobocon would be most helpful in finding base</DIV> <DIV>resonances of a sound board for example.</DIV> <DIV> </DIV> <DIV>I'd better hang on to the old tube job we have downstairs!</DIV> <DIV> </DIV> <DIV>Richard</DIV></BODY></HTML>