The A.P.E. concept started when Dean sent us a sketch and description of what he wanted to accomplish with a new training tool to help trumpet players learn to minimize mouthpiece pressure against the lips when playing in the upper register. The potential value of this type of training tool was obvious - but could we actually make it work as intended? After a few in-house experiments and design revisions, we figured out how to turn the idea into what is now another fantastic training aid for trumpet players. We then came up with a less costly Delrin plastic version that works just as well as the original silver plated brass model.