This is a simple web tool that'll help you find the change in pitch of an audio file when it is time stretched to fit a different BPM.
Change in pitch (semitones) = log2(Stretched BPM / Original BPM) * 12
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Calculates the pitch shift in an audio file after it is time stretched to fit a different BPM.
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danferns/key-bpm-calc
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Calculates the pitch shift in an audio file after it is time stretched to fit a different BPM.