This being the last option available when it comes to robotize your voice
or for sound manipulation of other sound sources...
So there is somethings that could be good to say about this,
but before lets take a look at the video that got made by Mr Nightradio.
In the above picture it is a synthesizer module set with a sawtooth as a carrier / modulator. For you that is not familiar with how a vocoder works you also have to program notes for the carrier to get the sound source / voice to be affected melodically.
There is room for a lot of experimentation with both carrier and modulator.
It is better to use with voices but could be anything both as carrier and modulator.
But it seems that as carrier it is better to use a synthesizer with the saw tooth.
There is a earlier vocoder made as metamodule for SunVox made by Gilzad that you can download in the "download" sub header on the top of the website.
It is less effective but to his defense he did not have access to the fantastic new module sound2ctl that Mr Nigthradio uses extensively in his Vocoder.
But it can be interesting to download both and see how they did the metamodules and compare etc.
Mr Nightradio has also provided us with the SunVox file before it become packed into a metamodule so that gives you another opportunity to go in and modify to your hearts
content and expand on the concept.
If you are really interested in vocoding I would suggest two more things that can be interesting if you have something to record into. One would be to use Caustics Vocoder module as it is easier to get good results with but you would have to go outside of the self contained workflow of one device and record out of one into for example the sampler of SunVox on another device preferably with a cable to not get the recording to noisy.
Or into a multitrack recorder. To use Caustics Vocoder you would not have to buy it as you could use the Demo version which would be without saving but in a case like this you would not be needing to save a song file anyway.
But the coolest thing you could do is to make a talkbox!
Not exactly the same as a vocoder but in my ears coming with a much more interesting and organic sound albeit less robotic.
Have posted a video before that shows you how to very easily and cheaply make one but will post it again now. Remember that in this video he is using a synthesizer but you can use any sound source, for example a Android device...
There is a lot of videos with different designs and how to make them but this shows clearly how it works. Another video I like is a guy using his guitar as a soundsource.