Hi everyone, i'm argentinian so excuse me if my english is not good. i'll try to do my best. I play trumpet since one year and a half ago. I cover up great all the instruments range (From low F# to high C) perfectly, but i feel that from G above the staff to high C the tone doesn't feel so "secure" and good. Also when i play live i can't play too much time in that interval of notes because it causes me fatigue very quickly, so i try to use that notes in "emotive moments" of my solos or only when the sheet music indicates. It's a simple matter, what was your experience, or in what way do you guys recommend working that part of the register so i can play there comfortably and not get tired to quickly. if what i wrote is not very clear let me know so i can write it again.