how can i store output voice to an audio file in freetts

I am trying to use freetts for a simple java application but i am facing a problem, can anyone tell me how can i save the output voice which is converted from text to speech into a wave file in my program. I want to do it via code.

This is the sample helloworld application which is given with the sample

/**
 * Copyright 2003 Sun Microsystems, Inc.
 * 
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL 
 * WARRANTIES.
 */
import com.sun.speech.freetts.FreeTTS;
import com.sun.speech.freetts.Voice;
import com.sun.speech.freetts.VoiceManager;
import com.sun.speech.freetts.audio.JavaClipAudioPlayer;

/**
 * Simple program to demonstrate the use of the FreeTTS speech
 * synthesizer.  This simple program shows how to use FreeTTS
 * without requiring the Java Speech API (JSAPI).
 */
public class FreeTTSHelloWorld {

    /**
     * Example of how to list all the known voices.
     */


    public static void main(String[] args) {

       // listAllVoices();

        FreeTTS freetts;

        String voiceName = "kevin16";

        System.out.println();
        System.out.println("Using voice: " + voiceName);

        /* The VoiceManager manages all the voices for FreeTTS.
         */
        VoiceManager voiceManager = VoiceManager.getInstance();
        Voice helloVoice = voiceManager.getVoice(voiceName);

        if (helloVoice == null) {
            System.err.println(
                "Cannot find a voice named "
                + voiceName + ".  Please specify a different voice.");
            System.exit(1);
        }

        /* Allocates the resources for the voice.
         */
        helloVoice.allocate();

        /* Synthesize speech.
         */


        helloVoice.speak("Thank you for giving me a voice. "
                         + "I'm so glad to say hello to this world.");


        /* Clean up and leave.
         */
        helloVoice.deallocate();
        System.exit(0);
    }
}

This code is working fine I want to save the output as a audio file on my disk.

Thanks Pranay