Just got back from Boy Scout camp where the Bugling merit badge was offered. I wasn't teaching the class but wished I had been available to help more. The person teaching the class was very knowledgeable musician but had never been exposed to the trumpet or bugle. I was there for the last class and offered my help with the kids passing off their required calls. I found an array of abilities from never picked up a horn to high school band students. Most were Jr high or Middle Schoolers. This is a walk before you run type situation and I spent what little time we had on tone. What good is halfway playing a call if you can't stand to be heard due to bad tone.
Now my question to the experts here is, how do you properly explain obtaining good tone to a young player where they recognized the difference? Not sure whether I'm approaching it the proper way or not. I get results but it is extremely difficult to explain and thinking someone with this experience with young players may have a simpler method of this.