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921B Oscillator Eurorack Module

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Analog VCO synth module for Eurorack

The Behringer 921B oscillator module for Eurorack is designed to form the foundation of a proper modular synthesizer rig. Players can control this oscillator with the specialized Behringer 921A oscillator driver, but it can also be used as a free-running LFO. Separate frequency and range knobs allow players to adjust the frequency range in semitones and in octaves.

Inputs and Outputs

The 921B oscillator features independent audio outs for each of the four waveforms which include sine, triangular, sawtooth and rectangular which can be patched out to different modules to unlock even more creative possibilities. A dedicated oscillator sync input and switch can be used to sync the 921B to a signal introduced into the "sync in" jack. Parallel link jacks allow the 921B to link to other 921Bs in the chain.

Authentic Circuitry, Modern Flexibility

This module belongs to a series from Behringer, bringing authentic reproductions of the circuitry from the modular 55, 35 and 15 series to the Eurorack format. Since the 1970s, these synths have been used by some of the world’s most famous pop, rock and jazz musicians. Now, musicians can build their very own, unique synthesizer that can fit in a standard Eurorack case for a very affordable price. Mix and match specific modules to create a personal sound to complement any genre of music.

Eurorack Ready

Installing the 921B oscillator is simple, as it was designed to fit into a standard Eurorack case. Just connect the power cables to the power supply and screw in the module using the included screws. This allows for the 921B to be mixed with other synth modules for a truly unique setup.


  • Vintage-sounding 921B VCO module from the '70s in Eurorack format
  • Controlled via the 921A oscillator drive module, or may be used as a free-running LFO
  • Separate audio outs for each of the four waveforms: sine, triangular, sawtooth and rectangular
  • Dedicated oscillator sync input and a switch for selecting either strong or weak sync
  • Parallel link jacks for frequency and width connections to 921A and multiple 921B oscillators
  • Frequency and width jacks can also be used as external I/O providing even more creative possibilities
  • From a series of modules inspired by the System 55, 35 and 15 series synths
  • Reproduces circuitry from famous pop, rock and jazz records beginning in the 1970s
  • Designed and engineered in the United Kingdom

An authentic addition to your Eurorack. Order now.


921B Oscillator Eurorack Module Specifications:

Eurorack requirements
  • 8 HP
  • 30 mA +12 V
  • 45 mA -12 V
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