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			Okay, I'm working with the formula's you gave me and I've got it narrowed down a little bit.  I have found at least two parts where the pressure will affect the runner length:The amount of air displaced (when calculating the velocity in the runners), and the speed of sound propagation (sqrt(gamma*R*T)).  Temperature and Gamma may change with an increase in pressure.  I'll post up the full formula I have when I've got the little details worked out.
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