Reason's Combinator offers a way to design elaborate patches by combining various instruments and effects inside a single super-device. In Reason 12 the Combinator is vastly improved, and Rishabh Rajan's new course "Reason: The Combinator 2 Explored" explains all its capabilities. The course starts with a quick tour of the interface, demonstrates a few presets, and explains how to map control knobs and switches to create a patch from scratch. There's a deep dive into the Editor, covering Key Ranges, Velocity Ranges, and CV controls, and the course continues exploring different layering possibilities and creating more patches by combining devices in various ways. It also shows how to customize the user interface of Combinator patches, how to control multiple parameters with a single knob, and how to work with third-party plugins. For anyone interested in taking their work in Reason to the next level, this course should have Reason users building their own self-contained Combinator patches in no time.