Unity3d:应该在哪个类中调用音频处理或计算

我正在创建一个音频可视化工具，该工具使用Unity5游戏引擎对振幅做出反应。我使用对数、RMS值和.GetOutputData.计算振幅

最初，我从Update类调用了我的函数，但它的反应时间太慢，可视化工具似乎与音乐不同步。我现在从OnGUI类调用我的函数，但它仍然不是对音乐的实时反应。

我应该何时或如何调用我的函数以获得最佳的实时音频可视化效果？有更好的方法吗？

感谢您的帮助。

我的可视化功能：

void OnGUI () 
{
    //PROCESS AMPLITUDE:
    /***/
    ///RETRIEVE THE AUDIO-SOURCE SAMPLES:
    //Declare and Initialize an array to store the samples;
    float[] samples = new float[iSamples];
    //Pass the samples' array to the audio-source;
    auTheCurrentSong.GetOutputData (samples, 0);
    ///CALCULATE THE RMS VOLTAGE VALUE:
    //Declare and Initialize the sum of the squared samples;
    float fTotalSquaredSamples = 0.0f;
    //FOR each sample in the samples' array...
    for (int counter=0; counter < iSamples; counter++) {
        //... Calculate the sum of the squared samples;
        fTotalSquaredSamples += Mathf.Pow (samples [counter], 2);
    }
    //Calculate the average or mean of the total squared samples;
    float fMeanSquaredSamples = fTotalSquaredSamples/iSamples;
    //Calc  ulate the root mean square (RMS) value;
    float fRMS = Mathf.Sqrt (fMeanSquaredSamples);
    //CALCULATE THE DECIBEL VALUE FOR OUTPUT:
    //Calculate the decibel value;
    float fdBValue = 20*Mathf.Log10(fRMS/fReference);
    //Clamp dB values:
    //IF dB values are less than -160...
    if (fdBValue < -160)
    {
        //...Clamp dB values to -160;
        fdBValue = -160;
    }
    //RESPOND TO PRODUCT:
    //Debug the decibel values to check for irregularities;
    Debug.Log (fdBValue);
    //Scale a 3-D cube vertically depending on the dB value;
    transform.localScale = new Vector3 (1.0f, fdBValue, 0.0f);
    /***/
}