code: func (c *Parser) String() string {
  	out := fmt.Sprintf("Format: %s - ", c.Format)
  	if c.Format == WavFormatID {
  		out += fmt.Sprintf("%d channels @ %d / %d bits - ", c.NumChannels, c.SampleRate, c.BitsPerSample)
  		d, _ := c.Duration()
  		out += fmt.Sprintf("Duration: %f seconds", d.Seconds())
  	}
  	return out
  }
docs: // String implements the Stringer interface.