code: function(event, id, msg) {
        var self = this;
        var events = self['_on' + event];
  
        // Loop through event store and fire all functions.
        for (var i=events.length-1; i>=0; i--) {
          // Only fire the listener if the correct ID is used.
          if (!events[i].id || events[i].id === id || event === 'load') {
            setTimeout(function(fn) {
              fn.call(this, id, msg);
            }.bind(self, events[i].fn), 0);
  
            // If this event was setup with `once`, remove it.
            if (events[i].once) {
              self.off(event, events[i].fn, events[i].id);
            }
          }
        }
  
        // Pass the event type into load queue so that it can continue stepping.
        self._loadQueue(event);
  
        return self;
      }
docs: Emit all events of a specific type and pass the sound id.
  @param  {String} event Event name.
  @param  {Number} id    Sound ID.
  @param  {Number} msg   Message to go with event.
  @return {Howl}