|XILS 3 :
|"The XILS 3 is a highly musically programmed instrument"
boris d hegenbart-matsui
Running a vocoder could bring a lot of hassle when you don't know how to do.
Furthermore the process depends on your DAW.
Here are some tutorial videos showing how to use the XILS V+ as a vocoder
In logic you can't use External synth while controlling the effect with MIDI.
In this video, the XILS V+ is used as a simple effect without MIDI, but using external synth as a carrier.