Oni/Edit:

Some arbitrary placement used to combat the repetitive nature of this song specifically regarding a few key patterns (i.e. trills, etc.). Any burst exceeding 64ths was converted to a hold.

Edit:

Repeating high and low pitched background sounds were layered in addition to the placement of mines (relative to Oni). 64ths at 86.03 seconds in was also layered.

Why are there quads?

The quads in the file are the product of layering a constant deep-pitched boom sound as 12 with a repeating high-pitched sound with 34.