I haven't noticed this much before, but lately, as I work softly into the upper register, my notes sound dirty. Like I have a stray slobber or something. I have to work and adjust to get a clear sound. If I add air and play loud, forte and up, it is clear. If I play soft, it gets dirty or kind of buzzy. I can clear it up with work. Any tips or is this just a stupid question and I should just work on it. I hope its not the start of a problem.