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POST
Normalize tempo, key, duration and vocal language. Use request setup for account headers.

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JSON body

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number
Round and clamp to 40 to 220.
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string
Root and scale; flat roots normalize to sharp equivalents.
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number
Round to five-second steps and clamp to 15 to 300.
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string
Supported two-letter language code; defaults to en.

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Response

Returns normalized bpm, keyScale, audioDuration and vocalLanguage. Unusable tempo, key or duration values can be omitted. An unsupported scale becomes minor; an unsupported language becomes en.