Yes, you can use this on spoken word. Set Retune Speed to 90% and Formant to 100% (neutral). Gently nudge off-key speech patterns. Because Autotune81 is high quality, you can correct a bored-sounding narrator without introducing the robotic "singing" artifacts typical of cheaper plugins.
: Unlike traditional pitch correction that pulls every note toward the center of a scale, Flex-Tune only applies correction as the singer approaches the target note. This preserves the singer's natural expressive gestures and emotional delivery when they are "off-center" on purpose.
Auto-Tune was originally invented by Dr. Andy Hildebrand in 1997, who applied algorithms used for seismic oil exploration to the human voice. By the time version 8.1 arrived, the software had evolved far beyond simple pitch correction: