You should be able to use any sound library.
To include a external library in Animator, go to the Project tab in the property panel. There you can add a script tag to your library in the "Head HTML" section e.g.
You could also add a link to some initialization code you have as well, or write it directly in a script tag e.g.
Finally, to tie it in to click events in Sencha Animator you can use the "Click Action" property of any stage object and set it to "Custom JS" and then open up your editor and add the js to play some sounds e.g.
//set up some sounds
soundA = new Sound(......
soundA.play() //or something similar