SP-808EX Vocoder.... Teach me, oh wise ones

Okay. Good site. I've learned a lot. I upgraded my 808 to the 808EX OS, and I'm not sure I understand how to use the Vocoder features. Any tips, clues, or advice would be very appreciated, and I could start making vocal tracks sound like robo-JLo. Okay... Bad idea... But still, I searched the site and can't effectively use the vocoder. Thanks.

La Mer.