I have a Fender USA jazz bass. Its a couple yrs old, mint cond. I just bought it used, and the salesman gave me some Rotosound 66ers strings. I don't like them. They are too bright and trebley for my taste. I am new to bass, but I know I like a more "traditional" sound. Less treble ,more warm and round sound. I've messed with my amp settings, but still too much "thinness" to the string sound. Any suggestions for strings? What difference in sound ,and what are the pluses and minuses of flat wound strings over round wound? THANKS!!