When iron components are too rigid, they can restrict the natural resonance and vibration of the instrument. This can result in a stiff, uncomfortable playing feel and a less-than-optimal sound. On the other hand, when iron components are flexible, they can enhance the instrument's resonance, allowing for a more responsive and expressive playing experience.
Despite the changes in format—from paper to pixel—the content of the Irons method remains ruthlessly effective. Teachers continue to assign these exercises because they address the physics of the trumpet, which have not changed. irons flexibility trumpet pdf