128 megs is the minimum memory required for Pro Tools Free. 192 megs is recommended, especially if you plan use other audio or MIDI applications while using Pro Tools Free.To allocate more memory for Pro Tools Free and DAE (note that you cannot change the memory allocation for Pro Tools win98): - Quit out of Pro Tools if it is running. - Find the applications. (Digidesign > Pro Tools > Pro Tools Free), (System Folder > DAE Folder > DAE). - Highlight the application and select Get Info from the File menu or hit command I (Cmd-I). - Select Memory from the Show popup in the info dialog. - Increase only the Preferred sizes, leave the Minimums at default values. For Pro Tools Free, set the Preferred size between 32000K and 50000K to start. For DAE, between 31000K and 50000K. Sizes will depend on how much system memory is available on the system as well as the size of your session and how many plug-ins you're running. Sizes can not be changed while applications are running. Check the About This Computer dialog under the Apple menu (when you are at the finder level) to make sure that you have at least 10 or more megs available once Pro Tools Free has launched. This is to ensure that your system has enough memory once all of the settings have been adjusted.