Ah, thanks for bringing this thread back to my attention. For the benefit of this discussion, I'll type out the section exactly so that you know what I'm talking about:
"The saxophone sound is very flexible and so is the pitch. Slight changes in your larynx, embouchure pressure, or air support can have a significant impact on intonation. That said, some general tendencies should be noted.
If you tune the instrument to its low G or F#, the following pitch tendencies occur on alto
1. Low Bb is sharp (the saxophone is intentionally built that way)
2. Low C, C#, D, Eb, and sometimes E tend to be flat
3. Middle C# is usually flat, especially on older horns
4. Middle D, Eb, and E are very sharp
5. Notes above high B are sharp
*Tenor players beware. The middle C on tenor is usually quite sharp. If you tune to Bb concert, you will probably pull out too much and tune the rest of the instrument flat.
Do the experiment with your horn. Tune the low G, then check every note throughout the entire range and make a graph of the tendencies.
The only way to effectively play the saxophone in tune is to tune the lower register and learn to play (voice) the upper notes down. The concept is called voicing, using your larynx to adjust the air stream to create the desired pitch and tone color, just as you do when you sing.
That's what I'm referring to! Keep chimin' in, folks!
Let me know which method you use (i.e. tune to G or voicing).