let me explain the title : I play a Lebayle LRII #7 for 8 years. Recently (one year ago) I decided to try to get some altissimo notes. I bought the "classic" books (sintra, rascher, rousseau...) and worked hard on overtones and voicing. I am able to hit a G altissimo using the F# key but I don't get any others altissimo (but that's ok, I know it's a long journey). Anyway, today I tried another mpc, an otto link tone edge #7* and altissimo G was way easier to hit, far more louder. I can hit the note with a tongue attack which is impossible with my LRII. I also can produce more overtones from the the low Bb (up to F above staff) and I can hear the G altissimo when I use the classic Fork + Bb side fingering. Should I switch temporally mouthpiece to work on my high notes or is it a bad habit ? The bigger opening changes my sustain as I have to blow more air and my low notes are less interesting. I don't want to ruin my sound just to get some new notes but I wonder if it's easier to get altissimo with a bigger tip opening and should I do use a new mpc or should I try harder with my regular one.