Profile: Ruben and Serge Fernandez come from the French city of Tarbes located in the south-west of France nearby the Pyrénées mountains. In 1972, while they were building small sound devices they became acquainted with a Moog synthesizer and decided to build their own sound synthesizer. In september 1975, they moved to Toulouse to complete their academic studies. Ruben graduated in Computer Science (where he learned the Cobol programming language) and Serge graduated in Electric Engineering. In a first stage they produced custom modules for their musician pals in Toulouse. The Série 11 modulars appeared in 1976.

VERTO, the french guitar player was one among the first users and contributed to the evolution of the Série 11 and also to the design of the keyboard version of the Kobol.
In 1976 they met Klaus Schulze who introduced the EMS synthi to them, and starting from that moment the design and production of their new systems were boosted. They created their company (a SARL) name RSF (the initials of Ruben Serge Fernandez) and production started in a small house located rue Claire Cazelles in Toulouse. About twenty modular systems (some of them housed in Samsonite suitcases) were sold accounting for a total of more than 300 modules. Next a series of master keyboards was also released among which a special portable model for Benoît Widemann (keyboardist of the famous French band Magma) that was customized to control Benoît's Minimoog. Benoît was also very committed in the development of all the synths of RSF. Show less