anchor.diff:  function songInterval(){
       var stop = false;
       while(songIntro[indAt].p <= frame){
  -        keyTap(songIntro[indAt].kc, songIntro[indAt].dn);
  +        if(songIntro[indAt].kc != -1)
  +            keyTap(songIntro[indAt].kc, songIntro[indAt].dn);
           indAt++;
           if(indAt >= songIntro.length){
               if(intro_loop > 6){
  
positive.code:             }
              else{
                  indAt = 0;
                  frame = -250;
                  intro_loop++;
              }
          }
  
negative.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},
               {kc: -1, dn: -1, p: 1550}
              ];