You know, something that I've noticed on other famous bass players and from my own experience as well is that a lot (but not all) of the people that you see doing slap demonstrations do it on 4-string as opposed to the other numbers of strings. I suppose I can understand how the low B-string can get in the way and muddy up the mix but what about 6 and 7-string basses? Basically, why do name bassists (i.e. Mark King, Victor Wooten, Stu Hamm for example) who can probably afford any kind of bass they want choose 4-string for their primary bass? Do you suppose there is something I'm missing other than the stuff I already named out above?