Album: The Downward Spiral
Some of the last few parts are repetative and layered, so here they are as best as I can get them...

Riff 1: bass w/wah effect
-----5---------3-------5-------3-0---|
-----------------------------------3-| x8
-x-3---3-3---3-----x-3---3-3---------|
-------------------------------------|


Riff 2:
-------------------|
-------------------|
-----------x-1-x-2-|
-1-----------------|
                   | x8
-----1-------------|
-------------------|
-------------------|
-3---------3---4---|
-3-----------3---4-|
-1-1---1-----------|


Riff 3: twelve times 
-----5---------3-------5-------3-0---|
-----------------------------------3-|
-x-3---3-3---3-----x-3---3-3---------|
-------------------------------------|

------------------------------------------------------3-3-3--3-4-4-4-|
-4-5-5-5-5-5-4-5--5-5-5-5-5-5-5-5--5-6-6-6-6-6-6-6--6----------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|


Riff 4:
-------------------|
-------------------|
-----------x-1-x-2-|
-1-----------------|
                   | x8
-----1-------------|
-------------------|
-------------------|
-3---------3---4---|
-3-----------3---4-|
-1-1---1-----------|

---------------------------------|
---------------------------------|
---------------------------4---4-| x4
-------2---3---3---5---5---5---5-|
-------3---5---5---6---6---------|
---------------------------------|


Riff 3 (x2 instead of x12)
-----5---------3-------5-------3-0---|
-----------------------------------3-|
-x-3---3-3---3-----x-3---3-3---------|
-------------------------------------|

------------------------------------------------------3-3-3--3-4-4-4-|
-4-5-5-5-5-5-4-5--5-5-5-5-5-5-5-5--5-6-6-6-6-6-6-6--6----------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|
---------------------------------------------------------------------|


Riff 5:
---------|
---------| x8
---------|
-0-0-0-1-|

On the fifth repeat, start fading in a guitar:
-------------------------------|
-------------------------------|
-------6-5---------------------|
-2-2-3-6-5-6-7-8-5-6-8---6-5-4-|
-2-2-3-4-3-6-7-8-5-6-8---6-5-4-|
-0-0-1-----4-5-6-3-4-6---4-3-2-|


Riff 6:
---------|
---------| x8
---------|
-0-0-0-1-|

---------------------------|
---------------------------|
---------------------------| or something like that, repeat twice for every
---3-----3-----3-----1-3-1-| bass measure
-3---3-----------3---------|
-----------4---------------|


Riff 3 (x4 instead of x12)

Riff 3 (x4 instead of x12)
Adding 2nd bass w/wah: (twice for every bass 1 measure)
-----------------------8-|
-10-8-10--8-8-10--8-10---|
-------------------------|
-------------------------|

Riff 3 (x8 instead of x12) again adding:
---------------------------------|
---------------------------------|
---------------------------------| x2 (once for every 4 measures of bass 1)
-5---3---5---3---5---3-----------|
-------------------------1-1-0-3-|
---------------------------------|

Riff 3 (x8 instead of x12) adding:
------------------------------------------|
------------------------------------------| x2
-12---10---10---9-------------------------| (once for every 4 measures of 
--------------------13---12------------10-| bass 1)
------------------------------13-13-12----|
------------------------------------------|


Riff 7:
-15---13---13---12---11---10---6-6-5-8-|
---------------------------------------|
---------------------------------------| x2
---------------------------------------|
---------------------------------------|
---------------------------------------|