changing prerecorded music

I am a novice at this process.  We have a very small church, and use iworship videos (mpeg) for part of our music ministry.  We have an old version of Easyworship (2009), and are considering upgrading to the newest version.  Is it possible to change the key of these prerecorded video tracks?  If so, what equipment would need to be added to the Easyworship program.  

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