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Notes high A and above use the neck octave vent. Notes G# down to D use the body octave vent. To see the effect of the octave vent on the pitch play low A then high A with the same embouchure and then release the octave key. You will see on the tuner the sharpness added when the neck octave vent is open. You can do the same test on A#, B, C, and C#. Typically the B's octaves are the most in tune because of the neck vent's "compromise" position. The A and C# are typically the most sharp both being 2 half steps away from the ideal vent position for the B.

I have had some success in bringing sharp high A's down in pitch by using Curt Alterac's "Pantyhose Technique". Sharp palm keys can be corrected by lowering key height and/or adding crescents to the toneholes.

It is also important to remember that playing too high on the mouthpiece pitch exacerbates the normal saxophone intonation tendencies. Make sure that the pitch of the mouthpiece and neck alone is close to an E concert and the mouthpiece pitch is no higher than a G concert. This needs to be the starting point before any intonation corrections are attempted on the sax.
 
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