anchor.diff:   keyword, so a variable is being created just for the cue.
   
   |`:name`
  -|cue key
  -
  -|Provides a name to identify the cue in the web interface and in the
  - text area of physical controllers which provide a labeled interface
  - for adjusting running effects, like the Ableton Push. If no name is
  - supplied, the name of the value passed with `:key` is used; provide
  - `:name` in cases where that would be insufficiently descriptive.
  +|variable name
  +
  +|Provides a name to identify the variable in the web interface and in
  + the text area of physical controllers which provide a labeled
  + interface for adjusting running effects, like the Ableton Push. If no
  + name is supplied, the name of the value passed with `:key` is used;
  + provide `:name` in cases where that would be insufficiently
  + descriptive.
   
   |`:short-name`
   |none
  
positive.code: http://deepsymmetry.org/afterglow/doc/afterglow.show.html#var-add-midi-control-to-cue-mapping[afterglow.show/add-midi-control-to-cue-mapping].
  
  |`:variables`
  
  |Specifies a sequence of show variable bindings that
  can be used by the cue's effect. Each variable specification is a map,
  
negative.code: long or not informative enough.
  
  |`:color`
  |white
  
  |Sets the color of the cue within the grid for hinting about its
  purpose and relatedness to other cues, to help operators learn and
  