Driving down to David Stanwood's on Monday, it hit me that, all along, I had the compact signal generator that I'd been dreaming of: my old Korg AT-12. (I've got to dig it out of the attic, where it was banished after an argument with my saxophone on a question of intonation.) I should be able to set the thing face down on the key bed, so that the speaker blasts directly into the case. What I might want to to is splice into the speaker leads, install a mini jack for audio out and use that signal to power some small speaker driver, which could inject thevibration into small and more out-of-the-way corners oftheaction cavitiy. If it could drive a needle probe that would be all the better. As I said, I haven't heard the Korg's output for over ten years and don't know how loud it is compared to the sound off of F4 on this 7'4" piano. Thanks, BTW for all of your suggestions for places where this vibration might be hiding. When I see the piano, it sits on the stage of the Claremont (NH) Opera House, far from any baseboard radiators or decorator concrete kitties. About ten years ago, I got rid of a similar noise in a Steinway B, coming from a blob of varnish on the edge of a nose-bo;t hole in the board, which after 50 years had crept close enough to the bolt to make noise with it. But this sound is very strong inside the action cavity. Bill Ballard, RPT New Hampshire Chapter, PTG "We mustn't underestimate our power of teamwork." Bob Davis
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