Aahhhh.... Good point. Read my post above. I do the changes on my PRACTICING. On a gig... it's my Kanstul flugelhorn with the Filp Oaks 3, and the Martin Committee with the Olds 3. Don't let the 3 fool you, it's just a number. For me, I swim in the Flip Oaks, but am tightly held like a push up bra into the Olds. But when I am not gigging the other 5-6 days of the week, it's the variety that keeps me in shape. I strongly recommend not to constrain yourself by being constrained to one mouthpiece. DISCLAIMER: For the newbies out there... BE CAREFUL... Changing may not be good until you have developed rudimentary embouchure skills with accuracy, intervals, tonguing and phrasing. Just like I would NOT recommend a middle school athlete to run both sprinting and cross country. But with time and appropriate stretching exercises and variable work out routine, the muscle is mature enough to run both events.