Play a couple of lines of a simple lyrical legato study using the syllable 'u' ( sounds like 'who'). Notice how it feels in different registers and dynamics.
Then wait a couple of minutes and do the same piece using the syllable sound 'ur' ( sounds like 'fur' or 'her'). Notice how this feels in different dynamics and registers.
Then do this same format using the syllable 'O' (sounds like 'oh') then the syllable sounds 'A' ( sounds like 'hay') then an 'AH' sound. Experiment with these for a week or so and if you are interested let me know your results in a comment on the blog.
My interest in this subject stems from my own playing discoveries and what I am noticing in other people's playing. For years we can go on what we have learned and practiced or on 'instincts' and just play. It is only when we hit a snag or a 'brick wall' or feel that something is not doing what it normally does that we have to figure it out.
This is where using different tools can be very useful. The use of vowels or syllables in wind playing is very fascinating for they naturally incorporate the tongue and embouchure muscles in creating shapes that can enhance or distract from sound quality and register and our air support systems.
I don't want to say to much more until a week or so from now.
Good luck with your discovery endeavor!