private void chkAddMp3_CheckedChanged(object sender, EventArgs e) { if (mMixer != null) { if (chkAddMp3.Checked) { mMp3 = CodecFactory.Instance.GetCodec("test.mp3").ToMono().ToSampleSource(); mMixer.AddSource(mMp3.ChangeSampleRate(mMixer.WaveFormat.SampleRate)); } else { mMixer.RemoveSource(mMp3); } } }