[knucklecutter]

Probably not. When people make slider adjustments for particular difficulties it's to balance the human and the cpu to try and achieve fair and balanced gameplay or to try to get realistic stats over the long run. I believe Josh's set is designed for allstar which should be playable for most anybody. If for whatever reason you have to play below allstar or want to use dynamic I would just leave everything on default, unless you want to alter the timing to make swinging easier or more difficult or change the pitch speeds to make the ball easier to hit.