How do I remove vocals with sony vegas?

I downloaded a episode of a anime show. I imported it to sony vegas. Now I have the whole episode on there, with music in the background. I am making a fandub, so I want to remove the vocals, when the anime characters talk, while still leaving the background music, so I can talk over the music. I want it to sound as realistic as possible. I am really serious about making one, but can't if I don't know to remove the vocals, when the anime characters talk. Pleas help!

I have Sony Vegas Pro 9 by the way, I also have audacity and wavepad, if any of that helps
 
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