.NET Naudio Second Audio File Loop for x Time

Code
Private Sub button1_Click(sender As Object, e As EventArgs)

    ' read mp3 files from disk

    Dim mpbacground As New Mp3FileReader("D:\song1.mp3")

    Dim mpMessage As New Mp3FileReader("D:\song2.mp3")



    'convert them into wave stream or decode the mp3 file

    Dim background As WaveStream = WaveFormatConversionStream.CreatePcmStream(mpbacground)

    Dim message As WaveStream = WaveFormatConversionStream.CreatePcmStream(mpMessage)



    Dim mixer = New WaveMixerStream32()

    mixer.AutoStop = True



    Dim messageOffset = background.TotalTime

    Dim messageOffsetted = New WaveOffsetStream(message, TimeSpan.FromSeconds(10), TimeSpan.Zero, message.TotalTime.Subtract(TimeSpan.FromSeconds(30)))



    Dim background32 = New WaveChannel32(background)

    background32.PadWithZeroes = False

    ' set the volume of background file

    background32.Volume = 0.4F

    'add stream into the mixer

    mixer.AddInputStream(background32)



    Dim message32 = New WaveChannel32(messageOffsetted)

    message32.PadWithZeroes = False

    ' set the volume of 2nd mp3 song

    message32.Volume = 0.6F

    mixer.AddInputStream(message32)

    Dim wave32 = New Wave32To16Stream(mixer)

    'encode the wave stream into mp3

    Dim mp3Stream = ConvertWavToMp3(wave32)

    ' write mp3 on the disk

    File.WriteAllBytes("D:\output.mp3", mp3Stream.ToArray())



End Sub



''' it converts a wave stream into mp3 stream

Public Shared Function ConvertWavToMp3(wavFile As Wave32To16Stream) As MemoryStream

    Using retMs = New MemoryStream()

        Using wtr = New LameMP3FileWriter(retMs, wavFile.WaveFormat, 128)

            wavFile.CopyTo(wtr)

            Return retMs

        End Using

    End Using

End Function