FSC Instruments has introduced a unique version of the Klon Centaur circuit called the KB-1. Rather than simply creating a replica like many others have done, FSC Instruments decided to expand on the original idea.
However, it's important to understand the KB-1. It does contain the Klon Centaur circuit, allowing you to achieve 100% Klon tones. But the KB-1 takes it further by incorporating an additional gain stage.