IMpc sampler question.

Ok,I'm very new to this iMpc thing just got it on Tuesday last week,there's not much on the manul that comes with this app, I'm using audio copy,don't know how that works it was suggested from the site,but they are both installed,
My question is,where are the files that get sampled? I don't have iTunes on my iPad ,inless it's different then my computer,oh and that's another thing I don't have a desk top any more.
Another thing : where is the thresh hold on this?is there a way to turn up the levels when sampling from mic ,like doing field work.i guess I need to find out where the input jack is and how it works,these are some of the major things I'm having problems with,other then that the rest is pretty basic feels like the real thing,this app just makes me miss my baby my 2kxl that I have installed everything my self,my damn screen just went out last year,any help is appreciated and I'll try to help you in what I know and figure out as I get this mastered peace
Dj e.d.e

Found it ,when you go to edit in the kit field there's edit and sound lib open sound lib and there are folders in there one will say my sounds that's where your samples go when you sample and put them into categories, hope this helps some of you cause it sue helped me, now I just need that thresh hold button when sampling but there's a volume for the sample in the edit. As well