@Marc – i had a lesson with my teacher, and he shuwed me where i should have the mouthpiece on the neck – otherwise i will never be able to play the high notes in tune regardless of reed choice (the high notes will always be sharp) and the low notes will never be in tune, the only notes on tune will be in the middle register of the sax.

The common misconception is to move the mouthpiece in and out to
tune the sax – which does work but it means you’ll never have all 3 registers in tune – to get all 3 registers in tune see the dropbox.

So now that i have the mouthpiece in the correct place, i am now out of tune, so the exercises given to me will change my embouchure to work with this new mouth position.

This means when i get my embouchure sorted, all 3 registers will be in tune when i play the sax, and at the same time it will get rid of the squeeking which has nothing to do with the reed – according to my teacher.

I now understand why a lot of uploads on here are always playing too sharp on the high notes and squeeking.