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Sweetwater
4.5 (9)
$55.90
Amazon
4.8 (17)
Used
Reverb
$83.51 New
$40.00 Used
Thomann
4.4 (14)
$38.00

Average Price: $61

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$149

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Based on price data from 4 merchants for "Behringer 921B Oscillator Eurorack Synthesizer Module". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Step into the world of vintage analog synthesis with the Behringer 921B Oscillator Eurorack Module. A faithful recreation of the classic 1970s synthesizer technology, this module delivers authentic vintage sounds with modern versatility. The 921B is not only a standalone VCO but can also serve as a free-running LFO, adding layers of depth to your modular setup. With its ability to output four distinct waveforms—sine, triangle, sawtooth, and square—simultaneously, your sound design possibilities are virtually limitless.

Whether you’re crafting atmospheric pads or gritty bass lines, the 921B's dedicated outputs for each waveform ensure precision and clarity. Its robust modulation capabilities, including pulse-width and frequency modulation inputs, allow for intricate sound sculpting. The oscillator sync feature with both hard and soft sync options lets you synchronize multiple modules for complex waveform interactions, expanding your creative horizons even further.

Ideal for both budding and seasoned synthesists, this module is part of Behringer’s accessible Eurorack lineup, inspired by legendary synths of yesteryear. Compact at 8 HP, it easily integrates into any Eurorack setup, empowering you to build a custom modular system that reflects your unique sonic identity.

Key Features:

  • Authentic vintage analog VCO with four simultaneous waveform outputs: sine, triangle, sawtooth, square
  • Requires a Behringer 921A Oscillator Driver for full functionality
  • Independent modulation inputs for pulse-width and frequency modulation
  • Hard and soft oscillator sync modes for complex waveform interactions
  • Ideal for both VCO and LFO applications, fitting seamlessly into a standard Eurorack case

Product specs

Type VCO Eurorack Module
Oscillator 1 x VCO
Waveforms Sine, Triangle, Square, Sawtooth
Depth 2.28" (58mm)
HP Size 8HP
Power Supply Requires Eurorack case and power supply

FAQs

What waveforms does the Behringer 921B Oscillator generate?

The Behringer 921B Oscillator generates sine, triangle, square, and sawtooth waveforms, offering a range of tonal possibilities for sound design.

Can the Behringer 921B Oscillator be used as an LFO?

Yes, the Behringer 921B Oscillator can function as a free-running LFO, allowing for modulation of other modules in your Eurorack setup.

Is the Behringer 921B Oscillator compatible with the 921A module?

The Behringer 921B Oscillator is designed to be controlled via the 921A oscillator drive module, enhancing its functionality within a modular system.

What is the size of the Behringer 921B Oscillator in a Eurorack setup?

The Behringer 921B Oscillator is an 8HP module with a depth of 2.28 inches, making it a compact option for Eurorack systems.

Does the Behringer 921B Oscillator have dedicated audio outputs for each waveform?

Yes, the Behringer 921B Oscillator provides separate audio outputs for each of its four waveforms: sine, triangular, sawtooth, and rectangular.

What type of sync options does the Behringer 921B Oscillator offer?

The Behringer 921B Oscillator features a dedicated oscillator sync input and a switch for selecting either strong or weak sync, allowing for precise waveform synchronization.

Cosmo Music - The Musical Instrument Superstore!

Cosmo Music - The Musical Instrument Superstore!

Behringer 921B Oscillator Eurorack Module - Quickview

Video thumbnail for Behringer 921B Oscillator Eurorack Module - Quickview by Cosmo Music - The Musical Instrument Superstore!

Behringer 921B Oscillator Eurorack Module - Quickview

Cosmo Music - The Musical Instrument Superstore!

Cosmo Music - The Musical Instrument Superstore!

Video thumbnail for VCO Behringer 921B & VCF 904A Eurorack by CAME asbl

VCO Behringer 921B & VCF 904A Eurorack

CAME asbl

CAME asbl

Reviews

PROS

  • Faithful reproduction of vintage Moog sound with modern flexibility

  • Affordable alternative to original Moog 921B oscillators

  • Solid build quality with robust controls and I/O jacks

  • Compatible with Eurorack systems, allowing individual pitch control

  • Excellent sound quality that matches or exceeds expectations

  • Easy pulse width modulation with compatible modules

  • Compact enough to fit in shallow Eurorack cases

CONS

  • Requires manual tuning and adjustment for optimal performance

  • Lacks a square wave by default, needs voltage input for adjustment

  • Stability issues; prone to drifting without thermal management

  • No included manual or spec sheet, guidance is lacking

  • Patch cables can clutter due to lack of linking connections

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Behringer 921B Oscillator Eurorack Synthesizer Module.

Features and functionality

  • The 921A oscillator driver in a Moog setup feeds CV to multiple 921B oscillators, acting as a master control for octave/semitone adjustments.

    Source

Comparisons

  • Unlike the Behringer, the Moog System 55 didn't require a separate oscillator driver, highlighting a key functional difference in setup requirements.

    Source
  • The Dreadbox Hysteria is favored over the Behringer 921B for its variable wave shape, PWM, and stable tuning, making it a reliable choice for stage use.

    Source
  • The Tiptop Audio Mantis case is recommended over Behringer's smaller setups due to its 208 hp capacity, providing ample space for module expansion.

    Source

Setup and maintenance

  • Owners report the Behringer 921B requires about 2 hours for tuning to stabilize, necessitating frequent tuning adjustments, particularly for live performances.

    Source

User experience

  • Users caution against Behringer modules for occupying excessive rack space, which may hinder future expansion compared to more compact alternatives.

    Source

Use cases and applications

  • The Arturia KeyStep Pro is highlighted as a suitable MIDI sequencer for the Behringer 921B, especially when planning to integrate multiple voices.

    Source

Mods and upgrades

  • The Mutable Instruments Veils clone, Cloaks, is suggested as an effective quad VCA to pair with the Behringer 921B for improved modulation control.

    Source

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