I could catch at least one of the many sources (fucking love when an artist uses that musical feature). There is one on almost every song, like an infamous Charles Manson dialogue introducing "Uncontrolled", a song full "prey-fear-agony" and a imminent fierce madness. By the way, the whole play seems to exhale that energy; violence, death, savagery, bloodlust, aggressivity...The beast on its pith; rough and pure killing instinct. Surely 90's groove/stoner influence too. Banging until the death!
Favorite track: Uncontrolled.