anchor.diff:  
   In order to enable Afterglow to send feedback about cue status to the
   lights on the nanoKontrol I needed to use the Korg Kontrol Editor to
  -set its LED Mode to _External_ (as shipped, they were in Internal
  +set its LED Mode to _External_ (as shipped, they were in _Internal_
   mode, and lit themselves when held down). Most MIDI controllers are
   likely to need similar configuration to work as feedback-capable cue
   controllers with Afterglow, but most I have seen do offer
  
positive.code: 
  The
  http://deepsymmetry.org/afterglow/doc/afterglow.effects.cues.html[afterglow.effects.cues]
  namespace provides functions for creating cues.
  
  TODO: Describe the functions and arguments, link to effect examples.
  
  [[controlling-cues]]
  Controlling Cues
  
negative.code: a cue triggered on one controller can be ended on any other controller
  by simply pressing the lit button or clicking the lit cell there.
  
  For example, to be able to trigger the Sparkle cue, which the examples
  namespace places at `(0, 7)` within the sample show cue grid, by
  pressing the bottom leftmost button on my inexpensive Korg nanoKontrol
  2 MIDI controller, after using
  http://deepsymmetry.org/afterglow/doc/afterglow.midi.html#var-identify-mapping[afterglow.midi/identify-mapping]
  