anchor.diff:  be present in their fixtures.
   
   |`:held`
  +|`false`
   
   |As described <<cues#held-flag,above>>, causes the cue's effect to run only
   as long as the corresponding controller button or pad is held down, if
  
positive.code:  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.
  
  |`:short-name`
  |none
  
negative.code: alone.
  
  |`:priority`
  |`0`
  
  |Sets the effect priority used when adding the cue's effect to the
  show. This can be used to make sure the effect runs before or after
  