ChannelMergerNode createChannelMerger([int numberOfInputs ])

Source 

ChannelMergerNode createChannelMerger([int numberOfInputs]) {
  if (numberOfInputs != null) {
    return _blink.BlinkAudioContext.instance
        .createChannelMerger_Callback_1_(this, numberOfInputs);
  }
  return _blink.BlinkAudioContext.instance
      .createChannelMerger_Callback_0_(this);
}