code: func (w *Writer) WriteInt32(sample int32) error {
  	err := binary.Write(w.sampleBuf, binary.LittleEndian, sample)
  	if err != nil {
  		return err
  	}
  
  	w.bytesWritten += 4
  
  	return err
  }
docs: // WriteInt32 writes the sample to the file using the binary package