Behringer System 55 Complete Eurorack Modular Synthesizer

1 x 914 Fixed Filter Bank

The 914 fixed filter bank gives you unprecedented control over the timbre and resonance of your synthesized sound creations. The Behringer 914 is loaded with 12 active bandpass filters — ranging from 125Hz to 5.6kHz — and 24dB/octave highpass and lowpass filters. Not simply an EQ, the Behringer 914 has a characteristic sound that adds harmonic richness to any signal.

1 x 904B Voltage-controlled Highpass Filter

A point-to-point reproduction sized for Eurorack, the 904B Voltage-controlled highpass filter delivers the smooth frequency sweeping, gritty character, and squelching high end that made its predecessor highly coveted by vintage synth collectors. The module consists of two controls: filter control voltage and frequency range. Bearing its historically accurate name, the filter control voltage knob sets the filter’s cutoff point, and the 2-position Frequency Range selector lets you choose between a low (4Hz to 20kHz) band and a high (10Hz to 50kHz) band. Not only does the 904B remove low frequencies, but it also accentuates the high frequencies for ear-blistering leads that slice through a mix. And when paired with the Behringer 904B voltage-controlled lowpass filter, it can create brain-bending bandpass effects. The 904B is equipped with signal inputs and outputs and three summed control voltage inputs for blending modulators that affect the filter’s cutoff point.

1 x 992 Control Voltages

It may look humble, but Eurorack experts will tell you that the 992 is much more than a utilitarian module. At its most basic, it’s a CV router with three control inputs and three frequency control to lowpass filter outputs, selectable with front-panel switches. The control input signals are summed, and that’s where things get interesting. By combining CVs, you can start crafting incredibly complex waveshapes, from musical undulations to unpredictable modulated chaos. And by routing the summed signals to multiple filters or other CV-controllable modules, the 992 gives you the power to develop synth tones with stunning depth and dimension. As a cherry on top, the 992 includes an attenuverter for scaling or inverting an external CV signal. Turning the knob clockwise adjusts the CV level from 0 to 10 (unity gain); turning counterclockwise adjusts the CV level from 0 to -10 (also unity gain).

4 x 911 Envelope Generator

The 911 envelope generator is a powerful sound-sculpting tool. Laid out in a standard ADSR configuration, the 911 envelope generator provides wide-ranging time intervals from 2ms up to 10 seconds, for tight snares and bursts, snappy pitched percussion sounds, epic stabs, and long, liquid drones. When building a Eurorack synthesizer, having an excellent envelope generator is essential — and, with the Behringer System 55, you get four!

2 x 921A Oscillator Driver

The Behringer 921A oscillator driver works in conjunction with the Behringer 921B oscillator module. Using the 921A oscillator driver, you can alter the frequency of the 921B oscillator module according to semitones or octaves, selectable with a rocker switch. Additionally, the 921A outputs an adjustable rectangular waveform for pulse width modulation. The 921A is CV-controllable with two summed inputs each for frequency and pulse width, for wild moving modulations. And unlike the original 1970s unit, the 921A isn’t constrained to affecting one oscillator unit; Behringer has designed it to drive up to 12 parallel oscillators.

1 x 921 Voltage-controlled Oscillator

The Behringer 921 VCO generates massive, gritty tones with its six selectable waveforms that include sine, triangle, saw, inverted saw, square, and inverted square. Or you can switch it into sub-audio mode for use as an LFO. The 921’s frequency control lets you select between stepped octaves or semitones, allowing you to create pseudo-polyphony when paired with one or more additional oscillators. For ultra-thick sounds, the 921 features pulse width modulation with two separate CV inputs, and you can add a heaping helping of dirt by adjusting the module’s clamping point, a type of old-school clipper.

3 x C3PA-O Oscillator Controller

The 992 control voltages module and the C3PA-O oscillator controller module are functionally similar, with the difference being an attenuator on the Behringer C3PA-O and an attenuverter on the Behringer 992.

2 x 995 Attenuators

The 995 lets you passively control the level of both audio and CV signals up to unity gain. The compact 8HP module contains three attenuators, which can be used in series to attenuate a single signal that can be sent to three different modules in your Eurorack system. Or you can use it in parallel to attenuate and then output up to three independent input signals.

1 x CP35 Attenuators

The Behringer CP35 attenuators module massively expands the creative possibilities of your Eurorack system. This 26HP unit comprises four passive attenuators, eight multiples, and +6V/-6V reference voltage outputs. The attenuators have an attenuation range of infinity to unity gain, and they are normalized from left to right. So, you can use them as an additional bank of four multiples or break the chain by patching into input jacks two, three, or four. Multiples are split into two banks, each with one input and three outputs. The Behringer CP35 is able to pass audio and CV signals, allowing considerable flexibility for creating complex patches within your Eurorack system.

1 x 962 Sequential Switch

The 962’s unique routing and switching capabilities empower you to transform an 8-step sequencer into a 16- to 24-step sequencer with other steps in between. The operation is simple. Run up to three signals into the 962’s three inputs, and output them to an oscillator, filter, or more. With a little patchwork, the 962 will switch between the input signals in sequence. For the Behringer 960 sequencer, that means switching between the unit’s three available patterns. However, the 962 doesn’t stop there: it is able to switch between other Eurorack units that output audio signals and CV. With some imagination, you can cook up mind-twisting patches that will send your listeners on a wild sonic excursion!

Behringer System 55 Complete Eurorack Modular Synthesizer

• Authentic reproduction of a legendary complete modular synth system
• Features 38 all-analog Eurorack modules built to vintage spec
• Comes with 2 Eurorack Go cases with PSUs and a Eurorack Go mounting bracket
• MIDI-to-CV converter allows you to control the system with any MIDI controller, hardware sequencer, or DAW
• Includes 144HP of space for additional Eurorack panels and 1 x 28HP blank panel, 2 x 56HP blank panels, and 2 x 2HP blank panels