anchor.diff:  interface>> and MIDI controller mapping implementations which can be
   http://deepsymmetry.org/afterglow/doc/afterglow.show.html#var-register-grid-controller[registered
   as grid controllers], like the <<mapping_sync#using-ableton-push,Ableton Push>>.
  +
  +== The Cue Grid
   
   The cue grid is a two dimensional arrangement of cues, where the
   bottom left corner is assigned coordinates `(0, 0)`. X coordinates
  
positive.code: |===
  
  [[controlling-cues]]
  Controlling Cues
  ~~~~~~~~~~~~~~~~
  
  The
  http://deepsymmetry.org/afterglow/doc/afterglow.controllers.html[afterglow.controllers]
  
negative.code: ====
  
  [[creating-cues]]
  == Creating Cues
  
  The
  http://deepsymmetry.org/afterglow/doc/afterglow.effects.cues.html[afterglow.effects.cues]
  