Yep the PA can already do that Diki...Done in the Sound Edit area where the user can specify how many voices (or in "Korg speak" oscillators) one can use for an individual sound.

You can have from one to 16 voices assigned to one instrument, which I think reading your post is what you are after. Each voice or oscillator sample can be sourced from anywhere, can be pitched wherever, can be poly or mono can have different adsr rates, and it goes on...

Of course if I am misunderstanding your meaning on this, feel free to correct

VERY comprehensive. If you have not had a look already, have a read of the PA3 Advanced Edit Manual....

Dennis