Toontrack Rock! EZX Expansion Pack Software for EZdrummer &ndash; Engineered by Neil Dorfsman &ndash; Expansive MIDI Library &ndash; Includes Download Key The Rock! EZX gives you four decades of engineering experience boiled down to eight tailor-made kits spanning the whole range of rock  from ambient to dry, vintage to modern Eight (8) complete drum kits mixed by Neil Dorfsman (Dire Straits, Sting, Bruce Springsteen) Drums recorded in various top studios in New York, Nashville, London and Stockholm Extensive MIDI library included Requires 2 GB free disc space, 512 MB RAM. A working EZdrummer version 1.3 or a Superior Drummer 2.3 (or above) installation