public static IntPtr Mp3ToMono(
	string inMp3,
	out byte[] dataMp3Mono
)

Public Shared Function Mp3ToMono ( 
	inMp3 As String,
	<OutAttribute> ByRef dataMp3Mono As Byte()
) As IntPtr

public:
static IntPtr Mp3ToMono(
	String^ inMp3, 
	[OutAttribute] array<unsigned char>^% dataMp3Mono
)

string mp3 = @"d:\down\stereo.mp3";
byte[] dataMp3Mono;
IntPtr formatMp3Mono = AudioCompressionManager.Mp3ToMono(mp3, out dataMp3Mono);
using (Mp3Writer mw = new Mp3Writer(File.Create(mp3 + ".mono.mp3")))
{
    mw.WriteData(dataMp3Mono);
}