Sound inside mc interactive graphics

Hello everybody.

I created an interactive infographics, that includes a few buttons to click on for further information.

On mouseclick a movieclip starts to show a little animation (for example, a car is driving from one side to the other and some text appears). I would like to add sound to this car while running. But it seems, sound in movieclips is not working on HTML5-Canvas. Is that right? Does sound really only work on the main timeline? I just need some confirmation before I go to prepare my students that they won't be able to add sound to this peace of work...

Problem is, it's an interactive infographics for the internet, we can't use ActionScript 3....

Man, everything was that easy when there was shockwave all around... 😉

Thanks for your help.