code: function soundLoadError(sound_name, onerror_cb) {
           // check the retry counter
           if (retry_counter++ > 3) {
             // something went wrong
             var errmsg = "melonJS: failed loading " + sound_name;
  
             if (me.sys.stopOnAudioError === false) {
               // disable audio
               me.audio.disable(); // call error callback if defined
  
               if (onerror_cb) {
                 onerror_cb();
               } // warning
  
  
               console.log(errmsg + ", disabling audio");
             } else {
               // throw an exception and stop everything !
               throw new Error(errmsg);
             } // else try loading again !
  
           } else {
             audioTracks[sound_name].load();
           }
         }
docs: event listener callback on load error
  @ignore