在C#中设置MCI音频参数的正确方法

using System.Runtime.InteropServices;

string command = "setaudio MediaFile volume to 50";

[DllImport("winmm.dll")]
public static extern int mciSendString(string command, StringBuilder returnValue, int returnLength, IntPtr hwndCallback);

StringBuilder returnValue = new StringBuilder(128);
mciSendString(command, returnValue, returnValue.Capacity, IntPtr.Zero);

string command = "setaudio MediaFile volume to 50";

string command = "setaudio MediaFile left volume to 80";
string command = "setaudio MediaFile right volume to 80";

string command = "set MediaFile speed to 1.5";