Originally Posted by -Agu-
There are 2 sounds (at least) layered together. There's that pad that sounds like saw waves playing major chords. On the top there's a square wave lead with some spacial processing (unison/reverb/chorus etc.) and some pitch bend on the initial transient.
I wouldn't worry about the square wave lead. The pad underneath is what makes it sound big. The square wave thingy on the top just gives if definition and air.
That's pretty much the gist of it IMO, I think the top sound is layered either with a vocal sample or some kind of additive formant synthesis to get the "aah" and "ooh" vowel sounds. If you use logic, alchemy is pretty good at that. Definitely layered with some kind of square wave though.
The lead also interchanges with saw stabs every four bars to create some variation.
For the pad underneath, I'm thinking powersaws (several voices of saws playing together with a slight detune, haven't seen a modern softsynths that can't do it) then lots of reverb