It's obvious that you can't alter the velocity on the piano?
You can't alter the velocity? how do you mean?
How can you create a crescendo and diminuendo on a single note? You need at least three notes to do that. You can push the key as hard as you want after you have already hit it, building up the pressure on the key, but it doesn't do anything.Is it a piano piece? If its wind then of course you can just blow soft at first, increase it and then build it down again.
Cresendo and dimuendos are what it looks like - but yes, Jlh is right.what about when we have a slurred stacatto?what do you think you do then?I think it's the same principle in understanding what editor or composer wants/do you know what I mean?you have 3 notes - they are all slurred -but two have a stacato