I have an iMac and just bought a Seagate 1T expernal hard drive. Currently most of my music is encoded AAC so I can keep it in the imac hard drive and be able to loaded in my iPod 30 Gig. Currently I have about 24 Gig in the library. Since I use my iTunes as music server for my home Hi-Fi systems using a wireless network and Squeezebox devices connected to my steroe system I would like to create a second library with just Apple Lossless files. I would like to use this library for my home listening but keep the current library in the iMac haddrive with the AAC files to sync them to my iPod. Can this be done? How? Thanks for your help.