I'm not sure if I'll be able to explain myself so that it'll be understandable but I'll try my best. While playing some lip-slurs, I noticed, when I played a little quietly, that I had been making accidental noises in my vocal cords in my throat; deep humming noises, like "uh, uh, uh" every time I changed my note. I don't know how to fix it and it's been bugging me for a few weeks now. Does anybody else have (or had) this problem? Is it a bad thing? Is my throat too constricted? If so is there any way to open up my airstream?