Some of the “old timers” on the list may already know of this link, but I just discovered it, and found it fascinating. It is a series of diagrams showing what actually happens as we blow into the fipple on our whistle (although the diagrams are actually of a recorder). Nothing heavy, just some interesting trivia.
http://ourworld.compuserve.com/homepages/kadima/fipple.htm
Blaine