Ben Harper - Whipping Boy Chords & Tabs

okay this song is really good but it's hard to figure out!
i know ben uses the slide, and he must be using an alternate tuning or something, 
its hard to play.
here goes

the intro

e-------------------------------------------------------------------|
b-------------------------------------------------------------------|
g-------------------------------------------------------------------|
d-------------------------------------------------------------------|
a--1--------------------1-----------------------------1---3--1/0----|
e-------3--(1-2-3--4)--------3-----(1-2-3--4)-----3-- -----------3--|

it's not all right, especailly the 4 part, but ive tried out other notes, and nothing 
to fit.

well one part i have almost all right is the fade-out
[ Tab from: https://www.guitartabs.cc/tabs/b/ben_harper/whipping_boy_tab.html ]
e----3--0------0-------3--0------0-----------------------|
b-----------3----3^-----------3----3^----1^--1^--1^--1^--|
g--------------------------------------------------------|
d--------------------------------------------------------|
a--------------------------------------------------------|
e--------------------------------------------------------|

most of it's straight out of the blues scale that goes like this

e------------------------0-3-------------------------|  try it out for
b--------------------0-3-----3-0---------------------|  improvising
g----------------0-2--------------2-0----------------|
d------------0-2----------------------2-0------------|
a------0-1-2------------------------------2-1-0------|
e--0-3-------------------------------------------3-0-|