Many times trumpet players will discuss a topic which can be confusing to a beginning student, i.e. valve compression. The term valve compression is usually misused for there is very little compression in any section of a trumpet. Air is free to move through the instrument for there are obviously two openings, one at the mouthpiece and the other at the bell end. What most discussions are centered on are the tolerances or space between parts through the instrument. These areas usual are the gap between the valves and their corresponding valve casings, the first, second and third valve slides…