Vocoders make voices sound robotic, drums sound melodic, and everything else sound really hypnotic. Vocoders are used by almost every major electronic musician.
LFO speed will determine how fast vibrato occurs. LFO depth (also known as amount) will determine how high and low the pitch is bent.
A modern vocoder combines two audio sources to produce a third “blended” sound. Usually, one of the input sounds is produced using a synthesizer while the other sound is recorded from a microphone.