         @showFrame(i)
 
   onClickPlay: ->
-    # play only once at a time
-    if @el.hasClass 'playing' then return    
+    return if @el.hasClass 'playing'  # play only once at a time  
     
     @el.addClass 'playing'
     @markingSurface.disable()   # no marking while playing

    # 'click button[name="no-tags"]'        : 'onClickNoTags'

    'keydown': (e) ->
      switch e.which
        when KEYS.one
          @showFrame(0)

        when KEYS.four
          @showFrame(3)
        when KEYS.space
          @onClickPlay()

  elements:
    '.subject'                      : 'subjectContainer'
