I have a Power Mac G5 PPC with maxed out ram and 2 1TB HD's OS X 10.4.11 Audio interface is MBox 2. Also using an Acorn MK-61 midi keyboard. Everything works well together, has no latency or buffer issues. I have no aspiration to upgrade to a bigger/faster/newer system. (I know it's old, so am I) I currently am using Logic Express 8, and it runs flawless with no hiccups. I do however desire to install Logic Studio 8, which I just purchased on Ebay for a very low price. I have 2 questions: Do I need to un-install Express 8 first? (and if so, how?) Do I need to do anything special to my song files for Logic Pro to open them? (They live on the non operating system drive in their own folder). I am sorry for asking a question that has probably been answered a hundred times, but I really need the most current advice on this issue. Please help. Thank you, and I really like this forum.