We are not in disagreement. If a horn is specifically designed with a reversed leadpipe then it does what it is supposed to. If we think that we can outguess the designer, we are plain wrong. If we take a Xeno and convert it, what I said will happen. That doesn't mean that nobody will like it. If we take two Xeno models with and without in a big concert hall, the standard one will have a more consistent sound throughout the hall. In a recording studio or outdoors, the reversed leadpipe could have advantages for the player. In this case the audience gets less. I am very wary of "comparisons". For they to be significant, we do need to have both horns in our typical playing environments. We all are masters of (self) deception.