Iv'e recently stumbled across a problem that iv'e never really had before. After about 10 minutes of warming up by doing long tones and some C-G lip slurs I feel ready to play. But no matter how long I prolong this warm up, I can never slur up to that middle C. I think the problem may be that My 'Natural' embochure contains very little upper lip. If I just slip in a little bit more top lip I can slur up to that C with ease, but my tone lacks slightly. I think my tone is pretty nice with my natural embochure and the range of which my tone is nice is from a Low F# up to about G/A. After putting in some more top lip my range changes to from about a Low A up to a top line F but my endurance and tone lack ever so slightly. So the question is, is it a good idea putting in more top lip, or shall I just stick it out with my natural embochure? Thanks, And I will be getting a private teacher soon!