Is there a plugin/script that allows me to create keyframes based on the stereo field of the audio?

[brayden351676665o5j]

Like depending on the decibels or frequencies on left or right ear

[Rick Gerard]

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.

[Dan Ebberts]

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.