The air column creates the sound, not the brass. <ducks quickly>
I have always found metal Links slower responding than similar faced rubber equivalents. Ralph Morgan wrote a six page article discussing the different response levels/characteristics of mouthpiece material. In his ads for his line of mouthpieces, Ralph claims a certain percentage more of volume and harmonics for rubber over metal. It's all about FEEL.Chu-Jerry said:The neck was designed for the horn just like it is. Even if changing the mass at the mouthpiece end changed the sound, that doesn't mean it would be better to remove it. It could just as well be worse.
It is wrong to think that more mass means reduced responsiveness. The mouthpiece mass itself can vary a lot. What about a metal mouthpiece? It has more mass than a HR one, but that doesn't make it less responsive, does it?.
Now, if you add a semi-precious stone to the neck, that's a whole different story.