OK, they say that answering your own forum post is the first step to insanity. But hey!
OK, I get it a little more now. So, the editor creates a whole new set up in a zip file. Which I'm guessing includes a new png with 'softer' shadow, which I could swap????? But looking in Pshop at the new and orginal pngs, I can't see any difference.
OK< I still need help!