some decompilers will give you any embeded audio. I hear So Think is a decent one.
However, and this is what I believe the general 'position' on using decompilers, when used for looking at OTHER peoples .swf's it is frowned upon. Usually just an email to the creator/owner or a post here with a question of how it was done will get you the same result (or better), so there is no need to 'steal' anyones hard work.
This is not to you specifically, I give the same 'rant' to anyone asking about decompliers