Most musicians are familiar with what a vocoder is - it takes one signal and modulates it with another signal. This makes it sound like an instrument is talking or singing, and was very popular in dance music (such as the very famous 'Party People' sample). What AnalogX Vocoder allows you to do is create a vocoded sample using any two sounds quickly and easily!
Controls are very simple, just load up the modulator sound, which normally would be the speech or whatever you wanted to modulate the output sound by, and the carrier sound, which would be an instrument such as strings or guitar that you like to make talk. Then choose either Preview (which will render and then play the sound out of your soundcard) or Render it directly to your harddisk as a WAVE file (16bit, mono, 44100). It currently only supports MONO sound files (they can be any sample rate or bit depth) but they must first be converted to mono using a program such as CoolEdit or Cakewalk Pro Audio.
Modifying the vocoder effect is straight-forward; the Bands slider is how many bands (frequency) will be left after the vocoding process - the higher the number the closer to the original it will sound. Window is how large a chunk of the audio it examines at one time - the higher the number the less distinct the sound will become. Finally, Overlap specifies how much of the previous Windows is mixed with the current window (the higher the number, the more distinct).