It seems like the satin, shot-blasted, and other finishes are relatively new with trumpets. Are they more than aesthetic? I can understand how they would hide small scratches, fingerprints, etc. And they make the instrument stand out. But how do they affect sound? Are they durable? Are there any other implications? Are they all available in both brass and silver, or are there different characteristics of the metals that make them more suited to one or the other?