mciSendString播放音效问题

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Media;using System.Runtime.InteropServices; // 命名空提供各支援COM Interop 和平台叫用服的成namespace WindowsApplication17{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        [DllImport("winmm.dll")]        public static extern int mciSendString(string m_strCmd, string m_strReceive, int m_v1, int m_v2);         [DllImport("Kernel32", CharSet = CharSet.Auto)]        static extern Int32 GetShortPathName(String path, StringBuilder shortPath, Int32 shortPathLength);        /// <summary>        /// 使用mciSendString播放音        /// </summary>        /// <param name="name">案名</param>        /// <param name="command">命令</param>        private static void mciMusic(string name,string command)        {            StringBuilder shortpath = new StringBuilder()；            int result = GetShortPathName(name, shortpath, shortpath.Capacity);            name = shortpath.ToString();            string buf = string.Empty;            mciSendString(command + " " + name, buf, buf.Length, 0); //播放        }        private void btnPlay_Click(object sender, EventArgs e)        {            // 播放            mciMusic(@"01.mp3", "play");        }        private void btnPause_Click(object sender, EventArgs e)        {            // 停            mciMusic(@"01.mp3", "pause");        }        private void btnStop_Click(object sender, EventArgs e)        {            // 停止            mciMusic(@"01.mp3", "stop");        }    }}

这个是在网上复制的
请问怎样实现循环播放功能，放大放小音量，新手厚颜 求代码。

[解决办法]
http://blog.csdn.net/psongchao/archive/2007/01/19/1487788.aspx
[解决办法]
看你发几次贴子，留个邮箱，发个程序给你。
[解决办法]
http://download.csdn.net/detail/libinguest/4672830
[解决办法]
http://blog.csdn.net/linux7985/article/details/7441277
比较常用的