A modular synthesizer manufacturer based in Lisbon, Portugal; the name is often abbreviated "CoTK". Club of the Knobs offers modules in the MU (Moog Unit) / Dotcom format, and meticulously re-creates the look and feel of the vintage Moog modular synths on which the Dotcom format is based. In fact, CoTK offers some modules which are precise re-creations of vintage Moog modules. However, the product line goes considerably beyond that, and includes some exotic modules such as a polyphonic envelope generator and a module that delays trigger signals. CoTK also offers some cabinets and packaged systems, such as a faithful re-creation of the Moog 15 modular.