Getting Started

I have a CVP 409 and would like to download midi files from the internet on my PC and then edit the midi files by changing the key or the tempo or volume or shorten or lengthen the midi file and then transfer the midi file to the CVP 409 so that I can play along with the midi file and also record my playing the music on the CVP 409.

Which Cubase version should I look at that can do this?