My extreme upper register (well, the limits of my range, I guess...) is off and on at best, sometimes the notes are there, sometimes they aren't. I've wondered if the mouthpiece being even a hair one direction or another could throw it off but it just isn't consistent from day to day. Why does this happen, and what can I do to get it secure? Do I need to use better air support, or try moving more air, or even back off? Here are some links of a performance I did for three of my friends last night that illustrate my problem - and any other comments/advice would be much appreciated too lol YouTube - Vivaldi Violin Concerto in A minor, I & III, for piccolo trumpet - Violin Concerto in A minor (about 4:37) YouTube - Adagio in G minor transcribed for Picc. Trumpet - Adagio in G minor (about 2:40 in) Thanks!