Very Ranma like
Do you trace Ranma video captures? It's just that sometimes your art is dead on (aside from the squiggliness) and sometimes it's all squished looking.
If you'd clean up the art, added more frames of animation to smooth it out, and change Akane's voice. It's kinda funny, but mostly just annoying. The other voices are great. Happosai is dead on and I might even swear that you just ripped that off the anime, but I'll give you the benefit of the doubt.
Anyway, the reason why the sound starts playing when you have stop() on the frame before is because of a stupid Flash quirk. Actionscript doesn't actually take effect until the frame AFTER it is called. This is the same reason why you cannot load a movie clip and alter its properties in the same frame. You have to wait one frame.
Solution: Try telling the movie to stop one frame earlier, or start the sound one frame later. I'd go with the latter option.
Keep up the great work!