It might be becouse I'm not playing it to its full speed, but if that is not the prob, how do you get the cool sound out of the "as the palaces burn" solo (By Lamb of god)
urinate on your pickups...that should give you the sound your looking for.
sounds like its been harmonised. which u wont be able to do by yourself. other than that, i dont know what you mean by a 'cool sound'.