Here’s a good YouTube tutorial concerning how to use Logic’s Vocoder with a bus sidechain.
There are so many non-traditional uses for Vocoder, not just the simple voice-animation, sometimes I feel one could spend days exploring vocoders for something totally new audio experiences.
Using a vocoder is also one way to break out from the current style of electronic music with no vocals and lyrics — sometimes I think it’s a shame that we don’t introduce human voices or elements into electronic music, just instrumentals. Vocoder use is one option. Also, if your voice is not that good, it does not matter, just sing, process it and otherwise make it sound interesting and different.