I'm editing some flash videos at work that have some updated audio, so I need to swap out some of the old audio with new audio.

I've never used flash before (I have experience with AE though) so I'm having some issues. When I create a new layer, and then import the audio file, I drag it into the stage. After I do that, I can see a flat blue bar in the layer I selected. But that's the problem - it's flat. The old audio have tons of up/down indicating there's actual sound, but when I place these new ones in, they have nothing. I preview it in the library window and it sounds incredibly deep. When I just listen to the audio file right out of the folder in the preview window or Windows Media Player, it sounds perfectly fine.

Could someone help me out here?