Hi,
Thank you for all your ideas. I found out what it was - as jbtsax suggested might be hapenning, the neck octave key was opening slightly. I reduced the pressure on the octave key and now I get D rather than the overtone. Is this something that can easily be fixed on the horn? I'm going to get a sax-playing friend to have a go to see if they notice any problems.
The tip for trying to get A 880Hz when blowing into the mouthpiece alone was handy and after some adjustments I managed to get it. I'll keep practising that.
Again, thank you for your responses.
Thank you for all your ideas. I found out what it was - as jbtsax suggested might be hapenning, the neck octave key was opening slightly. I reduced the pressure on the octave key and now I get D rather than the overtone. Is this something that can easily be fixed on the horn? I'm going to get a sax-playing friend to have a go to see if they notice any problems.
The tip for trying to get A 880Hz when blowing into the mouthpiece alone was handy and after some adjustments I managed to get it. I'll keep practising that.
Again, thank you for your responses.