I know this might seem like a stupid question, but having searched the web, and bieng a new-comer to this business, I am finding it difficult to know what are the differences between premiere pro 7.0 and 1.5. I know 7.0 was changed to 1.5, but are there any differences for the user? i have a copy of premiere pro bible and would like to know if it can be used with 1.5?