- Buckinghamshire, UK
No, not just with breath pressure you probably can't, but with the sound vibrations emanating from the vibrating reed you can.
A reed weighs a few grams and moves up and down a few thousandths of an inch. I can't see that having much effect on a rigid brass tube either, to be frank. I doubt there's any way to resolve this question. Even if someone tried a blind test of saxes in different materials any tonal differences could be accounted for by all the other differences between the saxes, so it would be necessary to have two absolutely identical saxes made of different materials and conduct a blind test with them. Even then the results would be largely subjective.