CEM and SSM chips

Analogue integrated circuits have been used in many synthesisers to implement signal processing functions which were originally performed by discrete circuitry components such as resistors, capacitors, and transistors.
Some of these chips would provide the usual subtractive synthesis modules such as voltage-controlled oscillators, filters, and amplifiers, and others would even implement a complete synthesiser voice in one single integrated circuit.
Analogue ICs were fundamental for the development of mass-produced analogues synthesisers. In particular, they were key components of the first programmable polyphonic synthesisers such as the Prophet 5.
The two major producers of analogue ICs in the 1970s were Curtis Electronic Music Specialities (CEM) and Solid State Music (SSM), whose ICs were used in many synthesisers produced by various electronic music instrument companies, such as Sequential Circuits, Oberheim, Roland, Crumar, EMU, Moog Music, Doepfer and many others.

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