Curtis Electromusic Specialities (CEM) is a company founded by Doug Curtis in 1979 specifically to design and manufacture integrated circuits for music synthesizers. Although the company still maintains a Web page, it is no longer doing business. (At least not that they are willing to acknowledge: before his death in 2007, Curtis apparently helped Dave Smith Instruments secure a supply of certain CEM chips to use in their Evolver line of synths. Whether these chips are new production or just stock that Curtis had warehoused is unclear.) The company manufacturered a wide variety of ICs, many of which incorporated an entire synthesizer functional component (for example, the 3340, which contained a complete voltage controlled oscillator). By using chips from Curtis (and its competitor, SSM),