On Fri, 22 Aug 2008, David Tayler wrote:
> ... I'm getting 20 milliseconds till the peak
> amplitude, ...

Thanks for the independent measurements which confirm the
delayed peak but measure a different delay time.

Here is a waveform that I recorded
https://ttt.ph.utexas.edu/raw_waveform.jpg
The delay till the peak amplitude is clearly visible.

> That's a lot
> faster than a tenth of a second,

Yes, by a factor of five.

> but my instruments have very thin
> soundboards.

It would be interesting to see exactly what
accentuates the effect.  Possibilities: 
soundboard, playing technique, type of string, whether
other strings are damped, string tension, room acoustics, 
whether the string is open or fretted, ....




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