attachSound on an included movie

I had sincerely NO idea how to search for this, since google didnt help me out this time, i’ve decided to post…

Let’s say i got Movie A, which loads Movie B at some moment. And let’s say that Movie B creates a sound, lets say:

var sndMusic = new Sound();

and then attaches it…

sndMusic.attachSound(“music”);

and starts it…

sndMusic.start(0, 1);

all this at some keyframe at B’s root.

problem is that… well, when i open Movie B alone, the music plays; when I watch it while being included in Movie A, it doesn’t… BUT the sounds that are simply added by dragging and dropping on a keyframe DO work on both cases. I believe it’s sth related to attachSound… any ideas? i’ve got mad trying to figure this out T_T!! thx =/