921 Voltage Controlled Oscillator

The Behringer 921 Voltage Controlled Oscillator is an authentic and meticulously engineered recreation of the iconic main oscillator from the Moog Modular 900 series. This Eurorack module is designed to be the primary sound source in a classic modular setup, delivering the powerful, rich, and stable analog tones that defined the sound of early electronic music. The 921 is a feature-rich VCO that provides all the core waveforms and modulation capabilities needed to build massive and expressive synthesizer voices.

The module offers a wide frequency range, adjustable via large, tactile octave and semi-tone knobs, as well as a fine-tuning control. It generates six simultaneous waveforms: sine, triangle, sawtooth, inverted sawtooth, square, and pulse. The pulse width can be controlled manually or via CV for classic PWM sounds. The 921 also features a dedicated sync input for creating classic hard-sync tones and multiple CV inputs for both fixed and variable frequency modulation. This comprehensive feature set, combined with its legendary all-analog sound, makes the 921 an essential cornerstone for any Eurorack system aiming for that authentic vintage Moog sound.

Features

• Authentic recreation of the classic Moog Modular 900 series 921 VCO.
• Large, stable, and feature-rich analog oscillator.
• Six simultaneous waveform outputs: Sine, Triangle, Sawtooth, Inverted Saw, Square, and Pulse.
• Manual and CV control over Pulse Width Modulation (PWM).
• Hard sync input for classic oscillator sync effects.
• Multiple CV inputs for extensive frequency modulation possibilities.
• Wide frequency range with coarse and fine-tuning controls.
• Requires a 921A Oscillator Driver for full functionality with 921B oscillators.