audience throws off pitch

[Dave Nereson]

----- Original Message ----- 
From: "Sarah Fox" <sarah@gendernet.org>
To: "Pianotech" <pianotech@ptg.org>
Sent: Thursday, March 25, 2004 4:18 PM
Subject: Re: audience throws off pitch


> Hi Wally,
>
> > Are you sure his clarinet wasn't going flat because of _his_ warm moist
> > breath going through it?
>
> The pitch would actually go sharp with moisture, owing to expansion of the
> barrel's diameter.

    Wouldn't a larger diameter (larger tube) produce a lower, rather than
higher, pitch?


 However, there's not really much of an effect on pitch.
> Woodwinds are pretty stable.  I once played oboe, which is probably the
> fussiest woodwind, and I never experienced that.
>
> Peace,
> Sarah
>

Maybe with woodwinds, but I remember orchestra rehearsals where after a
while, the brass, especially, would have to re-tune because they had gone
flat after the instruments warmed up.  Now, the air coming from the player's
lungs is still the same temperature, but the instrument is warmer.  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.
    --David Nereson, RPT

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