FAB FOUR is a virtual (software) instrument that includes 45 instruments inspired by the sounds of the Beatles. * System Requirements13 GB Free Hard Disc SpaceDVD DriveiLok Security Key, not inlcudedinternet connection required for one-time product activation * Recommended Mac SystemMac Pro Quad-Core Xeon 2.5GHz, 4GB RAMRecommended PC SystemIntel or AMD Quad Core 2.0GHz, 8GB RAM, 64-bit OS and host * Supported Interfaces PC: VST, ASIO, RTAS Mac: VST, Audio Units, Core Audio, RTAS