var s2 = {
  Version: '2.0.0a1'
};
 
s2.fx = new (function(){
  var queues = [], globalQueue, heartbeat, activeEffectCount = 0;
  
  this.beatOnDemand = function(dir){
    heartbeat[(activeEffectCount += dir) > 0 ? 'start' : 'stop']();
  };
  
  this.renderQueues = function(){
    queues.invoke('render', heartbeat.getTimestamp());
  };
  
  this.getQueues = function(){
    return queues;
  };
  
  this.addQueue = function(queue){
    queues.push(queue);
  };
  
  queues.push(globalQueue = new Scripty2.Effect.Queue());
  heartbeat = new Scripty2.Effect.Heartbeat();
  
  document
    .observe('effect:heartbeat', this.renderQueues)
    .observe('effect:queued',    this.beatOnDemand.curry(1))
    .observe('effect:dequeued',  this.beatOnDemand.curry(-1));
})();