In my practice sessions, when doing slurs, I have trouble with the jump from top space G to the C above the staff and back down again. The trouble is not with reaching the C but with a ‘harmonic’ that appears between these two open fingered notes. My questions are: Is this harmonic a function of design in all trumpets? Do some trumpets exhibit this harmonic more than others? What design parameters influence the appearance of this harmonic? What player compensation methods, other than air support, can be learned to minimize this harmonic?