Can somebody tell me what the visual and sonic difference between roundwounds and flatwound strings are? If there are other kinds of strings then please tell me about those as well. I'm asking because I saw a beautiful used Rick 4001V63 for close to nothing today* and I want to be able to tell what strings are on that thing, I also heard that you can't string a pre-4003 Rick with roundwounds, anyone want to comment on that? Thanks, Gunnar. *I knew more about the thing than the clerk did (having a Rick is a dream of mine), the look on his face when I told him the model, that it was a reissue and offered to check out what year it was manufactured was awsome!