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Behringer 921B Legendary Analog VCO Module for Eurorack

The 921B OSCILLATOR is an authentic reproduction of the circuitry from the “Modular 55 and 35” series oscillators used by the world’s most famous pop, rock and jazz musicians. Now you can build your very own, unique synthesizer that can fit in a standard Eurorack case for a very affordable price. Mix and match with specific modules to customize your synth and complement the genre of music you play or go all out and have a room filled from floor to ceiling with modules that’ll fulfill any synth geek’s wildest dreams.


  • Vintage-sounding 921B VCO module from the '70s
  • Controlled via the 921A OSCILLATOR DRIVE module, or may be used as a free-running LFO
  • Authentic reproduction of the circuitry from the Modular 55 & 35 Series