64-bit* with 32-bit compatibility for PC (*see system specifications)Full memory access with MAC (requires 64-bit MAC) * Quantum Leap RA - PLAY Edition provides composers with access to a variety of rare and unique instruments from Africa, Europe, India, the Americas and Australia, the Far East, and the Middle East and Turkish Empires. Musicians will find that RA has an amazing sound quality and they"ll marvel at the articulation of each instrument which has a wide range that goes from controlled to expressive. * System Requirements14 GB Free Hard Disc Space DVD Drive, iLok Security Key (not included) * Recommended Mac SystemMac Pro Quad-Core Xeon 2.5GHz, 4GB RAM Recommended PC System Intel or AMD Quad Core 2.0GHz, 8GB RAM, 64-bit OS and host * Included for both PC and Mac:32-bit standalone and plug-in versions included.64-bit PC VST (host must support 64-bit VST plugins) and standalone versions included.