What About "The Gap?" Watched a couple of YouTube vids about the gap between mouthpiece and the leadpipe. The lesson I took away from the vids is that little or no gap makes for a more in tune horn through the register, and that the less gap the less back pressure. But don't some of the Monette's have a solid piece of metal for the mouthpiece and leadpipe? In such Monette's is a gap built in or is the transition from backbore to lead pipe entirely smooth?