Sorry this is just a guideline, I am yet to figure out the fills:

|-------7-x-------------------7-x-------------|
|---x-7----7x--------------x7----7x-----------|
|-5----------55---------5-----------5---------|
|--------------x-8--8-----------------8--88---|


I think one fill runs a bit like:

|----------------------|
|----7-/12-------------|
|-5---------12---------|
|--------------10-8888-|


cant help you out with the quiet part, sorry
BUT
I recommend you check out some tabs for the same song by KARNIVOOL, then move that up 
fret, or semitone
Enjoy