anchor.diff:  
   ----
   $ sudo apt-get update
  +$ sudo apt-get upgrade
   ----
   
   Force audio through the 3.5 Audio jack:
  
positive.code:       202-second track second cd.mp3
  ----
  
  The player will speak the actual name of the author and the title of the book by reading
  the directory names. Each track must start with a unique number in correct order, followed by
  a dash with the suffix of `.mp3`. The actual name of the track is arbitrary.
  
  A very convenient way to create this structure is to rip CDs with `abcde`. It will 
  also handle multi CD books when used with commandline option `-W`, followed by
  the number of the CD:
  
  ----
  $ abcde -W1
  $ abcde -W2
  ----
  
  == Shortcomings and Improvements
  
  * Parts of the code might not really be thread-safe, should be reviewed.
  * The way button presses are handled could be improved. Implementation
    of an event queue might be a way to ensure that no button events are lost.
  
  == Copyright and License
  
  
negative.code: /home/pi/BookPlayer/start &
  ----
  
  Save and exit the editor. Make the `start` script executable:
  
  ----
  chmod 755 /home/pi/BookPlayer/start
  ----
  
  Reboot the Pi:
  
  ----
  sudo reboot
  ----
  
  === Audiobook Structure
  