Verse (Riff 1)
d  --------------------------------------------------- 
a  ------------13----------------12------12-----------      last time played
f  --------16----------------15------15---------------      slide down the
C  ---------------------------------------------------     12 on string
G  ---------------------------------------------------
D  ---------------------------------------------------
       w/ chorus
                                         
Riff 1b
f ----------------------------------------0-----0-------------
C -------------------------------------------3----------------   (clean tone)
                                                   fade in ^ 

Chorus (Riff 2)
d -----------------------------