http://www.jayfriedman.net/articles.php For those of you who haven't found this website it well worth a read. Jay Friedman is the principal trombonist with the Chicago Symphony Orchestra. Thanks to Jay, Manny, Wilmer, Ed et. al. for taking time to share!
A great resource. ... and some of the articles are by trumpet player, John Hagstrom... have a look at the one where Hagstrom talk about his first lesson with Jay! I monitor that site regularly. Ole