Simply, connect you mic in the "External In"s. Then go to "Effects" and in "Vocoder", make it OSC mode. There's a few other modes but they work kind of the same. Now, if you have a mono mic(which you probably do), go to "Input"(also in the effects section) and select "In L" or "In R" depending on which of these you connected the mic to. You can also vocode signal L with R, but i havent tried this yet. Hope i helped!
BTW. when going into the vocoder mode, the filter section changes to vocoder parameters, and the LFO's gets replaced by level meters. This can be changed back to LFO's by going to: "Config">"System">"LedMode">"Lfo"
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