Tuning: Drop D tuning, down 1 step. C,G,C,F,A,D
This might not be the actual tuning they use but it works. This is only the beginning but it's a start.

C|------------------------------------------------|
G|------------------------------------------------|
C|-10------13--12--13--10------13--12--13--9------|
 P.M..............................................|
 Tremolo pick each note.   
  
C|------------------------------------------------|
G|------------------------------------------------|
C|-13--12--13--9------10--12--13--12--------------|
 P.M..............................................|
 Tremolo pick each note except the last four.

Play 2X