How Do I Change My Voice Which I Recorded

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C#

i have a voice recorder and player. and i want to change my voice after i recorded it. changing is not matter.it can be a deeper voice for example. i dont really care that. here is my code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace SesProje
{
    public partial class Form1 : Form
    {
        [DllImport("winmm.dll", EntryPoint = "mciSendStringA", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
        private static extern int record(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
            record("open new Type waveaudio Alias recsound", "", 0, 0);
            record("record recsound","", 0, 0);            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            record("save recsound C:\\Users\\oguzhan\\Desktop\\ddd.wav","", 0, 0);
            record("stop recsound", "", 0, 0);
            record("close recsound", "", 0, 0);

            axWindowsMediaPlayer1.URL = "C:\\Users\\oguzhan\\Desktop\\ddd.wav";
            axWindowsMediaPlayer1.Ctlcontrols.play();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            axWindowsMediaPlayer1.close();

        }
    }
}