Bug toggle for backgroundmusic on/off is not working anymore

Bugs
1

the code at https://zimjs.com/slate button [HELP] to toggle backgorundmusic seems not working when toggle on/off
it does not toggle the sound out, why?

let backingSound;
const toggle = new Toggle({
   label:"music",
   startToggled:false
})
   .sca(.7)
   .pos(40,40,LEFT,BOTTOM)
   .change(()=>{
      if (!backingSound) {
         backingSound = new Aud("https://zimjs.com/assets/backing.mp3").play(.1, true);
      }
      backingSound.paused = !toggle.toggled;
   });

also not this code with an icon sound x

let backingSound;
const button = new Button({
   width:60,
   height:60,
   corner:0,
   backgroundColor:purple,
   rollBackgroundColor:pink,
   icon:makeIcon("sound", white),
   toggleIcon:makeIcon("mute", white)
}).pos(50,50,LEFT,BOTTOM).tap(()=>{
   if (!backingSound) {
      backingSound = new Aud("https://zimjs.org/assets/backing.mp3").play(.1, true);
   }
   backingSound.paused = !button.toggled;
});
2

It works if you preload your sound. Or you would have to assign the backingSound in a complete event. You are assigning a temporary object and not the actual sound as it has not been loaded yet. There is nothing we can do about this.

So the example in the Help section works when you select a sound using the assets as suggested - this preloads it automatically.