I'm not a vocoder expert as u can listen ... lol ... but anyway i personally cut the FX of the microkorg and use a DP4 ( not digital performer ) to warm it up.
The ENSONIQ DP4 is a marvelous hardware multiFX.
http://www.stanford.edu/~dattorro/DP4.htm=)
My opinion is : SELL your microkorg and BUY a ROLAND SVC 350 or an EMS one ... thats what i should do if i were rich =)