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"RSF Kobol Expander II, an ideal partner for your RSF Kobol Expander but also just as easily integrated into a vintage modular or semi-modular synth system such as those from ARP, Moog, EMS, Roland, etc as well as modern modular synthesiser systems from the likes of MOTM, Synthesizers.com, Analogue Systems, Analogue Solutions, Doepfer, & all the Eurorack variety...
These Expander systems were made by Ruben & Serge Fernandez of the RSF Synthesizer Company in France from 1979-81. It uses an SSM 2050 chip for the envelope generator as well as other rare IC's from that era alongside analogue circuit design.Certainly vintage, it seems the Fernandez brothers were inspired by the Moog & Oberheim synths of the day but as the vintage synth crew know all too well, RSF instruments had a character all of their own, with some unique features that allow for amazing flexibility, especially on the Expanders, thanks mainly to extensive Control Voltage (CV) implementation for all the modules within the unit, as evidenced by the number of jack sockets around the edges- 40 in total. (Note these are for 1/4" jacks & have been cleaned.)
There were only around 200 of these synth Expanders made so certainly a VERY RARE item.
Effectively 10 analogue synth expander modules housed in a 4U 19" rack. (Not including the multiples.)
Contains the following modules:
1 Ring Modulator
1 ADSR envelope
1 VCA
1 LFO
1 Mixer (3 Inputs & 1 Output)
1 Sample & Hold (S&H)
1 Noise Generator
1 Voltage processor
1 Gate Delay
1 Envelope Follower
2 Multiple Jack Groups (One group of 4, one group of 3)"
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