Music before meeting the shadow mantle holder

So before fighting the shadow mantle holder for the first time you have to go through a little passage, and there's this background noise while you go through it and I need to know which file that noise originates from or if there's some isolated recording of it somewhere for a little project of mine, if any of you could help with this I would greatly appreciate it.

Do you mean BIT ROOTS? It’s labelled “root_8bit” in the files

No, they mean ERAM.

Ah, then it’s “nightmare_nes”

Neither of these. After you enter the shelter, there's a little passage before you get to the room where you talk and fight with the shadow mantle holder, and there's a background noise there that isn't in the OST. Thankfully, I finally found out that it's GLACEIR slowed down by 1328%, but I don't know how to recreate the sound and don't have the equipment to get a clear recording of it, so if any of you do, could yo please try and send it to me?
EDIT: I finally managed to get the recordings, nevermind this post

Interesting discovery! I added that now to the GLACEIR wiki page.