I'll reiterate, with a slightly better explanation of where I'm coming from:
Tone IS in the fingers on any given instrument. No two players will sound exactly alike, and some will sound considerably different than the rest.
Now the trick with the knobs and such is to capture those differences in musical ways. Some instruments do this very well, and others (I'm talking to you, Telecaster Bass) capture only the barest essence of what's happening at the string.
Where we pluck along the string, how we pluck and a multitude of other personal factors are the root of any given tone. Translating that to speaker movement is just that: a translation of what's already there.
I.E. without the origin tone, there's nothing for the rest of the signal chain to work with. Garbage in = garbage out.
John