Special Voice Sound Effect: HOW TO?

Hello Forumbr
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Since there are so many creative people around here, I was wondering if someone can share his experience on helping recreating this soundeffect of the acapella:br
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http://www.youtube.com/watch?v=3KIbj4iZlXobr
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It’s a mashup by kap slap. I really don’t know how to describe this effect. It makes the acapella sound kinda “crispy” and kinda filtered in a really special way. Also on 01:20 the voices nearly sound identical (even though both rappers have really unique sounding voices). I asume this was made with ableton. br
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Hope you guys can help me out here. Thank you very much!