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Like depending on the decibels or frequencies on left or right ear
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Sound Keys, part of the Red Giant Suite from Maxon, is the tool you want.
I don't know of a stand-alone version or Sound Keys or another similar effect available as a single product.
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SoundKeys will let you focus on specific frequency ranges, but if all you need is left and right amplitude keyframes, AE's Animation > Keyframe Assistant > Convert Audio to Keyframes will give you keyframes for Left, Right, and Both channels.