tryed this a while ago. Opened up the dss file with the chat stuff in it. Changed the chatbubble from white to grey in the alpha layer (ONLY the chat bubble part). the result (attached) was a semi trasparent chatbubble with semi transparent text, and, for some lovely reason, every single bar in the game went semi trasparent along with it. Basically everything in that dss file got the same grey alpha layer
Oh ok, its bugged i guess. so i go looking to make the chatbubble into it's own dss file. one problem, the chatbubble dss is not referenced in the xml anywhere. great
so i dont think the answer is in the dss files.