Voloco
A real-time voice-processing app
Screenshots
Hunter's comment
Voloco is a real-time voice-processing app that combines automatic tuning, harmony, and vocoding. Pick a track from your music collection or Voloco's free beat library to sing or rap over, and it will guess the key of the track and tune your voice to that key.
Link
https://resonantcavity.com/voloco/
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