Where can I download/extract the dialogue files?

I am working on a trailer for Mass Effect 2. It's part of a project. I created one for ME1 and ME3, but I had some help. I also have nearly 40GB of recorded footage, but sadly it has music on the background and I can't afford to replay the game just to capture dialogue. Is there a way for me to actually download audio files? At least from a Female Shepard? I have spent days browsing, but only managed to find unused audio that never made its way to the final product.

If anyone could help me or point me to the right direction I would be etxtremely grateful!