Those soundtracks are made from Fleetwire and Cheshyre
Chase.fla (also called Dystrophy) (made by Fleetwire)
Sacrifice.fla (made by Cheshyre)
Anamnesis.fla (made by Cheshyre)
Powerless.fla (made by Cheshyre)
Dedmosrebuilt.fla (also called Eidolon Step) (made by Fleetwire)

Image Made by Dervion https://www.newgrounds.com/art/view/d...