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It depends on what you're asking.
After Effects can link the values of any digital audio file's amplitude to virtually any other parameter or control within AE. With the use of equalization you can make certain frequencies control different parameters. The 3rd party plugin Trapcode Sound Keys makes that process much easier and faster, but you can do it natively within AE too.
But as you mention ANALOG audio I'm not sure what you mean. Do you want real time animation generated from an external audio source? After Effects can't do that - it doesn't do anything in real time.
Apple Motion can assign parameter controls to MIDI controllers, allowing you to control parameters from a multitude of devices like musical keyboards, drum pads, MIDI mix controllers etc.
Hi Andrew, I am not a super techie, just imagine taking a certain word lasting about 2 seconds and have its frequency spectrum and sound volume alter any value, either color, contrast or, most preferred, liquifying effect in PS or AE. I am trying to create a synaesthetic effect, where you can "see" sound expressed in an image.
Well, AE can certainly do as you ask, but it will require a substantial learning curve to understand the linking of audio using expressions.
Also note Trapcode Form, a 3rd party plugin which can do some impressive particle-based effects controlled by audio:
Scroll down to the "Audio Preset Examples".
Hi Andrew, note that I strictly work with still images. Will that make it easier, it should, I would think...
AE doesn't care whether you work with stills or movies. The methodology is the same. No matter how much you may not want to dig into expressions or third-party plugins, you will have to learn these techniques eventually. For your purposes, Soundkeys tied to some effects parameters seems the quickest and easiest solution.