I need a crowd, but i'm alone.... there's a way?

[Parduz]

Suppose you want to record your own version of the famous "Haka"
http://youtu.be/ctA0dx-1cDQ?t=48s
but you're all alone.
There's something we can do using VSTs?

I don't need necessary a production level result.... i'm fine with something that could just sounds "right" to the casual listener.

[whyterabbyt]

multiple (differently pitchshifted and/or compressed and/or chorused) layers of multiple takes each
or something like
http://www.quikquak.com/prod_crowdchamber.html