Hi. Im on a 09-10 Imac that's been updated to Mavericks. I've bought an Mbox3 with Protools Express (10.4.3). Found out after that my model computer updated to Mavericks doesn't get audio I/O. And That PT Express doesn't run on Mavericks. AVID have told me the workaround is to either downgrade my OS to Mountain Lion OR install Mountain Lion on my computer partitioned OR install Mountain Lion on a separate drive. I'm leaning towards the separate drive (Seagate portable 1TB). Wondered what you guys thought was the best option? Managing back up is going to be an issue too. Thanks in advance.