Behringer FOUR LFO 4-Channel Eurorack LFO Module

The Behringer FOUR LFO is a quad voltage-controlled low-frequency oscillator module designed to be the modulation engine at the heart of a Eurorack system. Based on the open-source Xaoc Batumi design, it delivers four channels of independently assignable waveform modulation across an extraordinarily wide rate range — from 500Hz audio-rate oscillation, where it can serve as an FM source generating metallic, harmonically complex timbres, down to 28-hour cycles that create imperceptibly slow parameter shifts for evolving ambient installations and generative compositions. The four operating modes — free, quadrature, phase, and divide — transform how the channels relate to each other, opening up everything from four completely independent modulation sources to tightly locked multi-channel relationships that produce rotating stereo movement, rhythmically related parameter sweeps, and phase-offset animation across your patch.

In practice, the module earns its rack space through sheer versatility. The four faders provide immediate hands-on rate control, and the zoom mode solves the precision problem inherent in mapping such a vast frequency range to a single fader throw — essential when you need to nail a specific vibrato speed or lock a filter sweep to a particular rhythmic feel. Per-channel reset and sync inputs mean each LFO can slave to external clock or trigger sources, keeping modulation tightly coupled to your sequencer's timing. The 14HP footprint is reasonable for a quad module, and the USB Type B connector provides a path for potential firmware updates. Build quality is functional Behringer standard — the faders and jacks do the job, though they lack the tactile refinement of the original Batumi. For modular musicians building out their system's modulation capability on a budget, this module delivers four channels of deep, flexible movement that would otherwise require significantly more investment and rack space.