anchor.diff:  If the metronome flashes start driving you crazy, you can switch back to
   a static cue,
   
  -code,clojure---------------------------------- code,clojure
  +[source,clojure]
  +----
   (show/add-effect! :color blue-cue)
  -----------------------------------
  +----
   
   or even black things out:
   
  -code,clojure--------------------- code,clojure
  +[source,clojure]
  +----
   (show/clear-effects!)
  ----------------------
  +----
  
positive.code: two functions mapped, for realigning on bars and phrases). Here is how I
  do it for one of the buttons on my Korg nanoKontrol 2:
  
  code,clojure-------------------------------------------------------------
  code,clojure
  (show/add-midi-control-metronome-reset-mapping "slider" 0 45)
  -------------------------------------------------------------
  
  Then, whenever I press that button, the metronome is started at beat 1,
  bar 1, phrase 1.
  
negative.code: synchronized gear, and watch how Afterglow tracks tempo changes made by
  the DJ from then on:
  
  [source,clojure]
  ----
  (metro-start (:metronome sample-show) 1)
  ----
  
  When running live light shows you will almost certainly want to map a
  button on a MIDI controller to perform this beat resynchronization
  