Behringer 921B Oscillator VCO Module

The legendary sound of the “Modular 55 and 35” series oscillators is now within reach through Behringer’s authentic 921B OSCILLATOR reproduction. This faithful recreation captures the exact circuitry that shaped the music of renowned pop, rock and jazz artists, bringing professional-grade synthesis to your Eurorack setup at an accessible price point. Build your dream synthesizer piece by piece, mixing and matching modules to suit your musical style, or create an expansive modular system that spans your entire studio space.

The 921B operates under control of the Behringer 921A OSCILLATOR DRIVER, though it functions equally well as a standalone free-running LFO. Dedicated Frequency and Range controls provide precise adjustment across semitones and octaves, while these two modules together establish the core foundation for any serious modular synthesizer setup and serve as the starting point for exceptional musical creation.

Four distinct waveforms—sine, triangular, sawtooth and rectangular—each feature independent audio outputs, allowing you to patch different waveforms to separate modules for expanded creative routing possibilities. The built-in oscillator sync input with dedicated switch enables synchronisation to external signals via the Sync In jack, while parallel link connections allow multiple 921B units to be chained together for complex multi-oscillator configurations.