LEDs?  The answer is <b>logical output ports</b>.
   These are mappings that you define in the JSON configuration to essentially
   label the physical device ports with simple port numbers that the PC software
   can deal with.  The main point of contact with the output devices on the
   Windows side is <a href="http://mjrnet.org/pinscape/BuildGuideV2/BuildGuide.php?sid=DOF">DOF</a>
   ("Direct Output Framework").  DOF thinks of the outputs as a simple array of
   numbered ports, numbered 1 to <i>N</i> (whe