public static byte[] ChangeVolume(
	IntPtr format,
	byte[] data,
	int persent
)

Public Shared Function ChangeVolume ( 
	format As IntPtr,
	data As Byte(),
	persent As Integer
) As Byte()

public:
static array<unsigned char>^ ChangeVolume(
	IntPtr format, 
	array<unsigned char>^ data, 
	int persent
)

string inFile = @"in.mp3";
string outFile = @"out.mp3";
int persent = 50;
Mp3Reader mr = new Mp3Reader(File.OpenRead(inFile));
IntPtr format = mr.ReadFormat();
byte[] data = mr.ReadData();
mr.Close();
byte[] outData = AudioCompressionManager.ChangeVolume(format, data, persent);
Mp3Writer mw = new Mp3Writer(File.Create(outFile));
mw.WriteData(outData);
mw.Close();