Larry,
The way it looks is you plug your mic into the vocal processor, then plug the output of the vocal processor into the keyboard's Mic/Line-In--that's all there is to it.
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)