Modular Mastering Rack is a complete mastering package for your DAW. Contained in the package is a master track processing plugin which consists of an EQ, a Compressor, and a Limiter. (This processor should be placed on your master channel). Also included in the package are all three processors from the modular rack but as seperate plugins. (These seperate plugins can be used throughout your mix on drum channels or instrument channels). In total you will recieve four plugins (3 individual processors and 1 master channel modular rack). This is a complete mastering package for your DAW.