Can Someone please help me out and teach me how to "RAKE"

like in superterrorizer by Black Label Society...

i think its just when you mute strings and hit em....but it sounds different then that....maybe its not a rake? someone that has that song tell me please
You mute the strings then just sweep the pick across them. Make sure you are muting with your left hand, not your right palm or it wont sound right. Also, make sure you arent hitting any harmonics or anything when you mute it if you arent supposed to.
whats there to learn its like the first thing you do when you first grabbed a guitar before you knew how to play