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Most likely that sound is from a sound effects CD. I'm not saying that the producers for Outkast didn't create the sound ... but it's kind of a typical Sci-Fi sound ... so they probably just used a royalty-free CD. It could also be a patch from a modern keyboard - but I doubt it.
The sound was originally created with a synthesizer and had several layers to it. It reminds me of the sounds that the foley artists for Star Trek used to get with their Moogs.
Sorry that I couldn't be more help. If you are looking to emulate the sound with a keyboard I could possibly try to program it. I don't know how quickly I can get to it.
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