The iconic T-Pain / hip-hop auto-tune effect. Your voice snaps to musical notes in real time — even if you can not sing, you will sound melodic. Works for both singing and talking, creating that unmistakable robotic-musical quality.
No — that is the beauty of auto-tune. It snaps your voice to the nearest musical note regardless of your singing ability. Anyone can sound melodic.
Yes — even normal speech gets the auto-tune treatment, creating the robotic talking effect popularized in hip-hop and memes.