Need help: What effect do I use to get this sound?

[Liqliq]

Hello I want to record a vocal track in Garageband, but I don't know what effect to use to get a certain sound I want.

I'll give you an example:

http://www.youtube.com/watch?v=RoFXbt2tfbU

Starting from 0:37, how does he make it so it sounds like that? I know it's not reverb. But what effect can I use in Garageband that gives that "double voice" effect?

Thank you very much for reading and hopefully I can get some help!

 

[SchwartzSound]

It actually is literally recorded twice -- it's called double tracking the vocals. Here's a little article that mentions it:

http://www.soundonsound.com/sos/apr09/articles/doubletracking.htm

You could also try some "chorus" effects, or also a very slight delay can help give a thicker doubling effect. Or try a combination of all of these techniques.

Hope this helps!