code: func (wav Reader) GetDumbReader() (r io.Reader, err error) {
  	// move reader to the first sample
  	_, err = wav.input.Seek(int64(wav.firstSamplePos), os.SEEK_SET)
  	if err != nil {
  		return nil, err
  	}
  
  	return wav.input, nil
  }
docs: // GetDumbReader gives you a std io.Reader, starting from the first sample. usefull for piping data.