I am new to forums in general, but I felt it was now necessary to post this question.
For a piece in band, I must play a trill from the high Bb to Eb (or something close to that, doesn't matter if it sounds bad in this case). Apparently, Bb to F is also acceptable, should Eb be too complicated.
I do use the trill key that takes me from Bb to F, but due to the distance in pitch, my airstream requires such changes that I cannot actually trill. I can definitely move my fingers fast enough, but the airstream cannot change with it. I've been noodling with it for the past couple weeks and still cannot achieve anything. When I switch back to the Bb, it just overblows to the F. Something to note is that I switch between these trills and a Bb to C trill, should that make a difference to someone's answer.
Does anyone have some magical fingering or tips that I could use? Even if it isn't a direct solution to this, any tips and advice would be very much appreciated. I feel like I've looked everywhere and this is my last hope haha. I have to have this mastered within 2 weeks. D: