Event or streaming?

Let’s say I have a sound that I’ve made into a class in the library.

And I create an instance of this sound, and play it:

var sound:soundClass = new soundClass();
sound.play();

is this sound an audio event or an audio stream?

I’ve been having trouble synching sounds to animations (particularly with FP9) and I realized I don’t know the answer to the above question.

Do you?