When an elastic member vibrates, it temporarily elongates. That elongation changes the frequency of its vibration.
So, *WHILE* vibrating at a pitch, the string changes its pitch.
The best example is tuning your guitar. When you strike a string very hard the string actually stretches a little and increases the tension and raises the pitch.
You can see this yourself with a tuner. The harder you strike the string the more sharp it goes.
The same with tall frets: as you press down harder you are stretching the strings more and making them go sharp.
As the sound board distorts it will induce similar effects.
So, I imagine that a stiffer soundboard reduces some of that effect.
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Fazool "The wand chooses the wizard, Mr. Potter"
Taylor GC7, GA3-12, SB2-C, SB2-Cp...... Ibanez AVC-11MHx , AC-240
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