how ms agent will speak

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C#

.NET

Hi sir,

I am using MS AGENT in a window application, I am getting agent merlin and he says the text which in the textbox, but i cont hear the voice

Is there any soft wares that i need to download ?
How this merlin will speak, how can i hear the voice ?

this is the code which i used

namespace sample
{
    public partial class Form1 : Form
    {
        public AgentObjects.IAgentCtlCharacterEx Merlin;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            axAgent1.Characters.Load("Merlin", "Merlin.acs");
            Merlin = axAgent1.Characters["Merlin"];
            Merlin.Show(true);
            Merlin.Speak("Welcome Sir", "");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //axAgent2.Characters.Load("Genie", "Genie.acs");
            //Genie = axAgent1.Characters["Genie"];
            //Genie.Show(true);
            Merlin.Speak("Welcome Sir", ""); Merlin.Show(false);
            Merlin.Speak(textBox1.Text, "");
         }
    }
}

HOW TO CHANGE AGENT VOICE ??