Hey tido, I don't think sampling the voice would be the way to give it "echo" if you were playing live. I would get a keyboard that has an effects processor and a mic/line input, I don't know if the DJX (DJX2) has this but if it does that would be the way to do it. Or you could get the DJX and also get a Alesis NanoVerb or similar reverb/delay/echo effects box..... you'd only be spending about $100-$150 more. What kind of music are you doing???? The DJX is good for dance/hip-hop/techno/etc. I've heard....... but past that you'd do better getting something more "real" I've heard many differing comments about the DJX..... ranging from "I love it, it rocks" to "It's a cheap toy, don't buy it" I've never used it so I have no clue whether to recommend it or not.

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John 3:16 For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish, but have everlasting life.