Pitch and tempo change in Garage Band or Logic
I want to make a song go faster with the pitch also changing so the vocals become chipmunky. Either Garage Band or Logic Pro.
iPad Pro, iOS 12
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GarageBand and Logic are trying to keep the voices sound natural, when you increase the tempo. I would use the Vocal Transformer plug-in to turn the vocals into the Chipmunk voice.
In the Vocal Transformer you can raise the pitch by two octaves and increase the setting for the formant too: For example:
In my GarageBand version is a readymade vocal patch called " Experimental > Helium Voice", that is coming close to a Chipmunk voice.