I guess like a loud high sharp squeal. If I flow from note to note middle(d,e,f,g,a,b) it sounds ok but if I tongue middle G it goes.
From this description it sounds as if when fingering low G you are getting the high D overtone or harmonic. Some tenors tend to do this more easily than others. Below are some suggestions you might try:
- shape the mouth as though you are singing "AH" on the lowest note you can sing
- blow warm air directed down as if aiming at the LH thumb
- practice slurring down B - A - G and then holding G as a long tone
- when you can do this practice starting on G with just the breath, no tongue
- then practice starting G by tonguing the note
Suggestions for tonguing
When you tongue make sure you are using the portion of the tongue just behind the tip to touch the tip of the reed moving the smallest distance possible. Practice tonguing on just the neck and mouthpiece alone using the tu - tu - tu - tu - tu syllable while feeling under your chin with the other hand. There should be no movement of the throat or jaw. If there is, it often means that too much of the tongue is moving too far in the mouth.
Some beginning students learn to tongue by stopping the air with the back of the tongue like saying guh - guh - guh - guh - guh. This elevates the back of the tongue which can produce unwanted overtones similar to what you are experiencing on low G.
There also may be something out of adjustment with the octave mechanism on your sax that is causing this effect.
To test the octave key adjustment:
- finger G and forcefully hit the thumb octave key several times watching the neck octave pad. It should not move if in good adjustment.
- Then finger from G to A while pressing the thumb octave. The neck and body octave keys should alternate opening and closing completely.
-Check to see that there is at least a 1/16" gap between the neck octave key ring and the post extending from the body.
- If there isn't a 1/16" gap, place your thumb between the ring and the body of the neck and then gently push down on the neck octave key.
- Should you go too far, place a pad slick or tongue depressor under the pad and carefully push back on the ring until the desired gap is achieved.