I have two series of questions regarding the title.

What is it that the Auto Script Creator actually do in the process? If it can do it, I should be able to do it too right? When it's done, it comes out with the script.script inside the Music.bnk or something. Is that something like Souzooka's script in http://steamcommunity.com/app/218620/discussions/15/540744299835792525/ ?
Why can't the ASC do a series of stream files?

Also as a side thing, I tried to get 3 stream files of the same song, Full Force forward, and put them through ASC. Is it because the ASC uses the music.bnk file each time that it can't have all 3 pdmods at once? Seriously, while I did come to that conclusion, it doesn't mean shit if I don't know if that's the actual answer even if it does seem obvious.

In Hex Editing following past the existing bank stuff (I followed it anyways just for clarity sake):
Going through the guide, a difference in hex editors is apparent such as looking for C4 and BD. The only thing I could go off is his HO>.
Because of this I need to ask how do I go about finding the playback lengths and loop points? I've definitely tried; this is what I got for Full Force Forward:
; Playback length:
Replace : AB AA AA AA 5E 0A 0A 41 :
; Loop point:
Replace : 9F AA AA AA 5E 0A 0A 41 :
am I on the right track?

The latter is empty because I do not know what to do now. I think this was for replacing existing songs with other existing songs, but I really can't figure that out.

Someone asked a question in hex editing about adding values to which Bluewave41 answered with at the end
"...
5*60 = 300
300+18 = 318
318xxx where x are the milliseconds. (or just use 319000)

Pick any 8 bytes and change the double value to what you have and it turns into your hex value.

319000 would be 00 00 00 00 60 78 13 41 "
How did he change 319000 into 00 00 00 00 60 78 13 41?
Is that string of numbers what I need next to the Replace : lines?

I just want to be able to replace songs through scripts and not through .pdmod if I can. If I must go through pdmod, then I still need to learn this stuff right?

If something doesn't make sense, or you need me to expand on my problems please tell me.
Oh right, I also have no experience in any of this. Whatever this is.