It noticed there is a difference in the way to use sound files with the new version. After reading the documenation I used this:
of course it is still ok to add sounds on the timeline. I personally never since I prefer to control things in events.
// if I want sounds to loop
var props = new createjs.PlayPropsConfig().set({interrupt: createjs.Sound.INTERRUPT_ANY, loop: -1, volume: 0.5})
// no looping
var single = new createjs.PlayPropsConfig().set({interrupt: createjs.Sound.INTERRUPT_ANY, loop: 0, volume: 0.5})
// call the sound file with loop. music is the linkage name in the library
this.music = createjs.Sound.play("music", props);
// sound that does not loop - wrong is te linkage name in the library
createjs.Sound.play("wrong", single);