Question about Setting the Pins and Unison Stability

[Andrew and Rebeca Anderson]

Weather changes in a matter of hours.

At 01:22 PM 6/9/2006, you wrote:
>One of the problems I have been trying to solve is how to improve my 
>unisons so that they stay in tune longer and don't go out shortly 
>after I have tuned the piano. I apply firm test blows to equalize 
>the tension along the string, but find that the some of the unisons 
>in the treble still go out of tune within a few days or weeks 
>afterwards. I think the problem is due to not setting the pin 
>properly. The question I have is, during unison tuning, and when you 
>are tuning each outer string to the center string, do you turn the 
>tuning lever to raise the pitch to the high side of the center 
>string, to the point that you hear a "tinny sound" when the two 
>frequencies are different, and then turn the tuning lever to bring 
>the pitch back down so that it sounds pure? I read somewhere that 
>the amount the strings should be raised before bringing it down is 
>to the point that you can hear a beat of a few Hz, but raising the 
>pitch to the point where you hear a tinny sound is more than a few 
>Hz. Thank you for your advice.
>
>Robert Finley

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