Deserialize

LoadAudioClipFromDisk.cs

public static void LoadAudioClipFromDisk(AudioSource audioSource, string filename)
{
    if (File.Exists (Application.persistentDataPath + "/"+ filename)) {
        //deserialize local binary file to AudioClipSample
        BinaryFormatter bf = new BinaryFormatter ();
        FileStream file = File.Open (Application.persistentDataPath + "/" + filename, FileMode.Open);
        AudioClipSample clipSample = (AudioClipSample) bf.Deserialize (file);
        file.Close ();

        //create new AudioClip instance, and set the (name, samples, channels, frequency, [stream] play immediately without fully loaded)
        AudioClip newClip = AudioClip.Create(filename, clipSample.samples, clipSample.channels, clipSample.frequency, false);

        //set the acutal audio sample to the AudioClip (sample, offset)
        newClip.SetData (clipSample.sample, 0);

        //set to the AudioSource
        audioSource.clip = newClip;
    }
    else
    {
        Debug.Log("File Not Found!");
    }
}