To be honest dude, I don't think from what you're saying is anything more than a bunch of vocal 'ahh' harmonies following the route notes.
If you want to do this yourself, sing the route notes and work out the fifth, octave etc and once they're all put together, slap a load of delay on them and really make them settle in the mix then they'll pad everything out and make things more full as-it-were.
This works along with pads and strings but using your own or your singer's voice to do it can make it sound really nice. Check out my friends in With One Last Breath - I think their self titled song does this really well
Hope this helps!