Create a new solid the size of your composition and apply Effect > RG Trapcode > Sound Keys.
In the Audio Layer pop-up, select the audio layer.
Set the work area duration to something like 5 seconds.
Press RAM Preview ('0' on numeric keypad) to see the spectrum move with the audio.
Now use the green square to select an area of the spectrum that should be captured.
Then press Apply in Sound Keys.
Press the 'u' key to see the keyframes generated.
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