AS3: SoundMixer.computeSpectrum()

public static function computeSpectrum(outputArray:ByteArray, FFTMode:Boolean = false, stretchFactor:int = 0):void

Takes a snapshot of the current sound wave and places it into the specified ByteArray object. The values are formatted as normalized floating-point values, in the range -1.0 to 1.0. The ByteArray object passed to the outputArray parameter is overwritten with the new values. The size of the ByteArray object created is fixed to 512 floating-point values, where the first 256 values represent the left channel, and the second 256 values represent the right channel.