lately, I've seen some Jaco tribute video on youtube and the guy who played bass had that replica of the "Jaco sound", that fat and smooth sound (which I'm sure we all know) I'm kind of curios about it, what creates that sound? i know Jaco used an ampeg, fretlles fender (and flat wound strings?) an of course there is a sound man involved. so if one wishes to have similar sound, which veritable is the most important, the bass, the amp? effects? (and please with no "the bass player" answers).