I have Logic Pro 8 and a couple buddies have Logic Pro 9. We are talking about buying an external HD and collaborating on a project. I know that when i loaded Logic 8 on my machine i placed the libraries on an external HD to keep my MacBook Pro HD roomy (there are a lot of support files). I guess my question is if we share a HD (at different times) can we work on the same project. IE. If I lay down some guitar tracks on 8 can my friend take the drive home and lay down some drum tracks? Would it be best we all have the same version?