The Focusrite Scarlett professional plug-in suite offers a comprehensive collection of Compression, Gating, EQ, and Reverb for tracking and mixing in most popular formats including VST/AU and RTAS (Pro Tools).Each powerful plug-in has a plethora of fast and easy-to-use presets, and every plug-in parameter can be finely tuned to bring out the optimum sound you want, exactly the way you want it. Superb sonic quality Vivid GUI with life-like classic porthole VU meters, red anodized metallic feel, and extremely detailed metering Faithful recreation of classic compressors and gates modeled on original custom Focusrite hardware to deliver an authentic vintage 1960s Opto sound Gate can operate as a stereo gate and, in different dual mono modes, one signal can be used to trigger the gate of another (ideal for tightening up a bass line) Classic Focusrite EQ curves and controls, all modeled to offer an authentic response across the entire audible frequency spectrum Professional reverb with concise controls Power PC G4/G5 or Intel Mac Mac OS 10.4.11 or higher 512 MB RAM XVGA [High Color 1024×768] Windows XP (XP2 or higher recommended) or Vista (All Versions) Pentium III 600 MHz CPU or faster (1GHz CPU recommended) 512 MB RAM XVGA [High Color 1024×768] Windows: VST Mac OS: VST, Audio Unit, RTAS**No returns/exchanges on Software