Later, he also began tuning his guitar to lower pitches, sometimes as far as three semitones below standard guitar tuning (e.g., on "Children of the Grave", "Lord of this World", and "Into the Void", all on the album Master of Reality).
Později také začal kytaru podlazovat do nižších poloh, až o tři půltóny než je standardní kytarové ladění (charakteristické jsou skladby "Children of the Grave," "Lord of this World," a "Into the Void," všechny z alba Master of Reality).