I understand that you obtain maximum amount of resonance (overtones) when when your pitch is dead in the center. I just recently changed my embouchure (about 1.5 months ago). Everything is correct as far as embouchure is concerned (i have a teacher that helped me with that). Although I can play fluently I'm starting to have problems with my sound. The center of my sound is fuzzy and in a attempt to get rid of the fuzziness I tend to over blow making my tone sound horrible. Over blowing just makes me work harder and the sound is not even close to being resonant. I've figured out that my problem is that my embouchure is not stable. I came to that conclusion when I realized that I'm not able to maintain notes in the center of the pitch. It goes center, flat, sharp, back to center ext... I do practice with a tuning CD that I have. I hear the pitch and then match it until I hear overtones but lately this has become a struggle for me because I over blow in a attempt to not have a fuzzy center and my chops not being stable also adds to the problems. What would you suggest that I should do? ps. yes I made sure my horn was clean and I do listen to orchestral players a lot. I think I have a pretty solid sound concept.