anchor.diff:      
       $("#play_button").click(function(){
           if(song_playing){
  -            clearInterval(songInterval);
               $("#play_button").html("Play");
               song_playing = false;
           }
  
positive.code:              {kc: 2, dn: 200, p: 800},
               {kc: 1, dn: 200, p: 950},
               {kc: 15, dn: 200, p: 950},
               {kc: 16, dn: 200, p: 1350}
              ];
negative.code: function songInterval(){
      var stop = false;
      while(songIntro[indAt].p <= frame){
          if(songIntro[indAt].kc != -1)
              keyTap(songIntro[indAt].kc, songIntro[indAt].dn);
          indAt++;
          if(indAt >= songIntro.length){
              if(intro_loop > 6){
  