A simple script for Adobe After Effects that generates 10 separate null objects with keyframe data for different audio frequency bands. You can then use these nulls to set up a responsive graphical equalizer (frequency analyzer).

BasicEqualizerGenerator.jsx

{  
	//Begin Undo group
	app.beginUndoGroup("Generate Graphical Equalizer");

	/*Variables:*/
	//How far apart each null is placed across the screen
	var nullPlacementWidth = 0;
	//Creates a variable that holds the selected comp
	var curItem = app.project.activeItem;
	//Creates an array that stores the lowpass values and the highpass values
	var lowVals = [1,60,170,310,600,1000,3000,6000,12000,16000];
	var highVals = [60,170,310,600,1000,3000,6000,12000,16000,20000];
	//An array to hold the null objects
	var eqNulls = [];
	//An array to hold the audio layers with EQ data
	var eqAudio = [];
	//Create a variable to hold the control audio layer
	var controlAudioLayer = null;

	/*Functions:*/
	function placeNulls()
	{
		nullPlacementWidth = curItem.width / divisionNumber;
		//TODO: Write code to place nulls
	}

	function createNulls()
	{
		for(i = 0; i <= 9; i++)
		{
			//Setting the null we're currently working with
			var curNull = eqNulls[i];
			//Adding the null
			curNull = curItem.layers.addNull();
			//Changing the layer name
			curNull.name = lowVals[i] + " - " + highVals[i] + " band";
			
			//Defining the effects group
			var effectsGroup = curNull("Effects");
			//Adding a slider control
			effectsGroup.addProperty("ADBE Slider Control");

			//Sending the layer to get the audio data from the proper eqNull
			ampTransfer(curNull);
		}
	}

	function ampTransfer(curLayer)
	{
		//TODO: Add code
	}

	function audioDuplicate(control)
	{
		for(i = 0; i <= 9; i++)
		{
			//Creates a duplicate of the control
			eqAudio[i] = control.duplicate();

			//Turns on the track
			eqAudio[i].audioEnabled = true;

			//Names the duplicate
			eqAudio[i].name = lowVals[i] + " - " + highVals[i] + " band";

			//Adds the highpass
			addHighLow(eqAudio[i], true, highVals[i]);

			//Adds the lowpass
			addHighLow(eqAudio[i], false, highVals[i]);
			app.executeCommand(app.findMenuCommandId("Convert Audio to Keyframes"));
			curItem.layer(1).name = lowVals[i] + " - " + highVals[i] + " band";
			//Turns the audio off so as not to interfere with the other tracks
			eqAudio[i].audioEnabled = false;
		}
	}

	function addHighLow(curLayer, highBool, freqVal)
	{
		var effectsGroup = curLayer("Effects");
		var effectBase = effectsGroup.addProperty("ADBE Aud HiLo");
		//Changes the Cutoff frequency
		// var highLowPass = curLayer.property("ADBE Effect Parade").property("ADBE Aud HiLo");
		if (!highBool)
		{
			effectBase.property("ADBE Aud HiLo-0001").setValue(2);
		}
		effectBase.property("ADBE Aud HiLo-0002").setValueAtTime(0, freqVal);
	}

	/*Main:*/
	function main()
	{
		//Check to see if a single layer is selected
		if(curItem.selectedLayers.length != 1)
		{
			alert("Please select ONE layer with audio.");
			return;
		}
		//Check to see if curent layer is a footage layer
		if (curItem.selectedLayers[0].matchName != "ADBE AV Layer")
		{
			alert("Please select a layer with audio.");
			return;
		}
		//Check to see if the current layer has a sound component
		if (!(curItem.selectedLayers[0].hasAudio))
		{
			alert("Please select a layer with audio.");
		}

		//Set selected audio layer as the control audio layer
		controlAudioLayer = curItem.selectedLayers[0];

		//Duplicate audio layers
		audioDuplicate(controlAudioLayer);

		//Create the nulls
		//createNulls();
	}

	main();

	//End Undo group
	app.endUndoGroup();
}