The KN-8828B gives the user a high level of manual control of the roast profile. A profile is the dynamics of how heat is the applied to green coffee. There are a nearly infinite number of variables when roasting coffee, and to a greater or lesser extent, they all affect the taste of the finished product. In order to teach you how to get the best from your Hottop Roaster we have developed this detailed document of roast profiling on the KN-8828B which includes a graph of an actual roast and all the "Hows and Whys" profiling can improve your coffee.