BB, No opinions on the signal Ginny, except it seems a lot of effort for what could be disappointing results. Here are a few elusive grunts I found, in no particular order -- 'cept for the first one from last week: - decorative concrete cat on carpet, adjacent to rear leg with brass ferrule. Strangely, F4 was the frequency that caused the cat and the leg to get together; - keyframe bedded, but one keyframe glide was waffling side-to-side in the keyframe due to hole being drilled oversized (frequency dependent); - bulkhead mounted sostenuto rail mounting bracket loose (freq & velocity); - "dancing" washer under loose plate lag (freq/velocity); - loose leg mounting plate; the part on the piano, not the leg (Kawai-style mount, although it wasn't a Kawai); - microscopic gap between plate and nose bolt "shelf" (Paul Monroe found this one, and it may have been more of a buzz or sizzle than a grunt) I'm sure there are more, equally elusive, but at the moment, they're eluding my memory too! FWIW, I now have an F4, velocity dependent grunt on a Yamaha CFIII. The typical/easy/reachable stuff has been checked, but nine feet is a lot of area to cover from the keyboard, even with my trombonist's arms. I too need to somehow excite the piano while doing a walk-about. Funny, there's never an extra hand when you need 'em. Good luck! Jim Harvey, RPT At 10:45 PM 7/11/99 -0400, you wrote: >I'd been listening to a grunting sound, like a fallboard-to-front-stretcher >or loose metal lyre brace, during the tuning of a Falcone 74, sympathetic >to F4. In trying to chase it down, the best I could come up with was that >it was coming from inside the action cavity (loud and clear). [cut]
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