1. Regulates resistance.
2. Helps you achieve your desired sound quality.
Fine tuning resistance with a backbore relates to your own physiology (air capacity, coordination of chest, back, and abdominal muscles, elasticity of the lips) and your personal musical goals (maximum required volume, tone color, broadness of sound, intensity, and technical efficiency). Each and every backbore that you play-test will score slightly differently in each of these categories. Your own trumpet and choice of cup style will set the parameters for this balancing act.
I think we would all agree that there are as many sounds as there are musicians. In my conversations over the years with seasoned trumpet players, I hear an often recurring theme: "No matter what the mouthpiece, the player will find a way back to his own sound if given enough time."
Where the Warburton System becomes so effective and valuable is in this area of concern. Rather than having to make physical adaptations to achieve your musical goals, your equipment is "customized" to enhance your most natural approach to trumpet playing. The result is the elimination of tensions which serve to work against efficiency and progress.
Refer to the trumpet mouthpieces page for more information about the playing characteristics of our backbores.