audience throws off pitch

[Dave Nereson]

 I doubt
> the diameter of the tubing expands all that much.  I think it has more to
do
> with the acoustical properties of warm versus cold air, that is, a cold
instrument will cool the air quickly, wheareas after it has warmed up, it
stays at about the same temperature as when it left the player's mouth.
>     --David Nereson, RPT
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