code: function(id) {
              if (!Crafty.support.audio) return;
              var c;
              for (var i in this.channels) {
                  c = this.channels[i];
                  if ((!id && c.active) || c._is(id)) {
                      c.active = false;
                      c.obj.pause();
                  }
              }
              return;
          }
docs: @
  #Crafty.audio.stop
  @comp Crafty.audio
  @kind Method
  
  @sign public this Crafty.audio.stop([Number ID])
  
  Stops any playing sound. if id is not set, stop all sounds which are playing
  
  @example
  ~~~
  //all sounds stopped playing now
  Crafty.audio.stop();
  
  ~~~