I was looking at E. Rousseau JDX alto hard rubber mouthpieces ,they have a V shaped entry for air to preform the venturi effect , angled sides to chamber . Also noted that the metal pieces they make have extreme slanted sides to chamber. Claimed results would be faster air ,increased performance ,blah and more blah . Asking the experts opinions (as in custom mouth piece makers) and players on this matter ,does this design make a difference that matters in the real world ? Would sound would be enhanced by increase of air speed or make the air you are providing more effective by this particular design ? I have not noticed other manufactured mps. going the same direction . Also ,after selmer I dont think new ones are made this way although I am only going by pictures, and I think the high baffle was done away with . Many thanks for this long winded inquire .