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Anyone know the likely cause of this sound ? (Read 1164 times)

Offline ted

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Anyone know the likely cause of this sound ?
« on: February 22, 2018, 09:46:24 PM »
Very occasionally, my piano emits the strange whistle in the attached recording. It is not an artifact of recording and not a sympathetic vibration outside the instrument. It occurs, I suppose, about once a fortnight, usually during very active passages involving both pedals, but try as I might I cannot generate it deliberately. It isn't a major issue, I am just curious, and if somebody knows a likely cause I shall ask my tuner about it next time.

"We're all bums when the wagon comes." - Waller

Offline Bob

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Re: Anyone know the likely cause of this sound ?
«Reply #1 on: February 23, 2018, 12:08:40 AM »
I'm not sure what to listen for.  Is it reverb or resonance with something?
Favorite new teacher quote -- "You found the only possible wrong answer."

Offline ted

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Re: Anyone know the likely cause of this sound ?
«Reply #2 on: February 23, 2018, 02:44:36 AM »
About three seconds into it there is a whistling sound, Bob. Yes, it could indeed be a peculiar resonance within the piano itself, but which part is making it and why so infrequently ? That is the puzzle.
"We're all bums when the wagon comes." - Waller

Offline Bob

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Re: Anyone know the likely cause of this sound ?
«Reply #3 on: February 25, 2018, 01:55:12 AM »
Is it possible to recreate it if you play the same music?

Then I was thinking you could dampen string to narrow it down if it's strings.
Favorite new teacher quote -- "You found the only possible wrong answer."

Offline ted

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Re: Anyone know the likely cause of this sound ?
«Reply #4 on: February 25, 2018, 10:30:33 PM »
Curiously not Bob. I have tried unsuccessfully to generate it in all sorts of ways. As I say, it happens so seldom it doesnít affect my music, so Iím not overly concerned. My present conjecture is that it is partly induced by ambient temperature in much the same way as a singing tap, but it is peculiar in that only very specific circumstances initiate it.
"We're all bums when the wagon comes." - Waller

Offline Bob

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Re: Anyone know the likely cause of this sound ?
«Reply #5 on: February 26, 2018, 09:58:22 AM »
I was thinking of that.  You'd have to have to know what was played along with the temp and humidity.
Favorite new teacher quote -- "You found the only possible wrong answer."