Excuse me if I treat this issue again but I'm waiting the right moment to go for the Osx and Logic upgrades (Tiger & Logic 7.1). Now I'm working with 6.4.3 on Panther 10.3.9 with my Digi 002 rack (using digicore audio 6.1.2!!) and all work fine (except for the fact that ProTools doesn't launch anymore). I took PTools 6.9 but I'm waiting to upgrade it because I'm afraid I get some problems. I would definetely know if the new combo Tiger/Logic7.1/Digi002rack (and the new digicore audio) work without various pops and clicks. Thanks who will answer. Fulvio