anchor.diff:  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
  +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]
  
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: namespace defines some helpful functions for working with cues, and
  defines a
  http://deepsymmetry.org/afterglow/doc/afterglow.controllers.html#var-IGridController[grid
  controller protocol] which rich controller mappings, like the one for
  the
  http://deepsymmetry.org/afterglow/doc/afterglow.controllers.ableton-push.html[Ableton
  Push], use to attach themselves to a running show, and synchronize
  with the web interface.
  
  TODO: Flesh out, discuss individual functions.
  