"Heresy is the culmination of work carried out from 1987 to 1989 and utilizes subterranean location recordings originated within crypts, caverns, mines, deep shelters and catacombs, together with material of seismic and volcanic origin. It also takes advantage of psycho-acoustic phenomena and the physical effects of low frequency information...Heretic is comprised of early versions and alternate mixes that finally lead to Heresy."
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