I would not be surprised at all if the "noise" were the darkness already planning its embodiment.

An alternative possibility could have been suggested by the Anyder dungeon, though, and the lore associated with it. Anyder teaches us that a) Lahabrea was a professor of something called "phantomology" which as far as I can tell is creating monsters for science and as a strange art form, and b) that Anyder seemed to have trouble controlling its creations. We know Archaeotania broke out, and a bunch of creatures did as well, none of which seems directly related to the crisis.

Amaurot made me think of Dumbledore and the Pensieve from Harry Potter. Emet-Selch recreated his memories perfectly, but was it only nostalgia that motivated him? Maybe he was trying to figure out the source of the original crisis by recreating it, and maybe Anyder is part of that recreation, so that he could examine and re-examine it again. And in the 10,000+ years since the events portrayed, it must have occurred to him that an expert monster maker was in his midst, and that that that monster maker's creations sometimes escaped.

It's even possible that the two things are connected. Perhaps Lahabrea was working alongside the voice of the darkness all along. He clearly had a major hand in the summoning - there is a statue of Zodiark in his section of Anyder. It is even possible he planned the crisis, which may explain his extra anger and bitterness compared with his fellow Ascians with Hydaelyn.