I have now been using my Sonos system for about 4 months and very pleased with the results,I have a NAS device for storage of my miusic and so far I have added all my wifes cds . Recently there was a problem with a WAV file that was corrupted and I have since changed to using apple lossless and I have found that there are overall improvements.Not sound related but just simpler and easier to use . So as a result I invested in an IPOD touch partly as I can use it as a Sonos controller via an app which means I now have a remote for the unit attached to my hifi. Now the hard bit..... . The computer has my sons music files on it within itunes and my files will be stored on the NAS with ITUNES MANAGING THEM. When I sync my ipod how do I get it to sync with the NAS and not his itunes files?