My simple lip sync script

Unity Engine
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1

It is based on this GetSpectrumData test code:
https://docs.unity3d.com/ScriptReference/AudioSource.GetSpectrumData.html

I used the index of 5 but you can tweak that.

It even works with audioSource.PlayOneShot

float[] spectrum = new float[64];
audioSource.GetSpectrumData(spectrum, 0, FFTWindow.Rectangular);
float scale = Mathf.Log(spectrum[5]) + 10f;

Then to get it between 0 and 1 I did this:

if (scale > maxSpectrumValue)
{
    maxSpectrumValue = scale;
}
float normalizedScale = scale / maxSpectrumValue;
if (normalizedScale < 0)
{
    normalizedScale = 0;
}