Pa_OpenDefaultStream

var Pa_OpenDefaultStream: function(

  stream: PPPaStream;

  numInputChannels: CInt32;

  numOutputChannels: CInt32;

  sampleFormat: PaSampleFormat;

  sampleRate: CDouble;

  framesPerBuffer: CULong;

  streamCallback: PaStreamCallback;

  userData: Pointer

):PaError;