Behringer 904B Voltage Controller High Pass Filter - Analog High Pass VCF Eurorack ModuleVintage inspired Highpass Filter for Eurorack The Behringer 55 Eurorack modules are authentic reproductions of a legendary modular synthesizer, with all of the quirkiness and analog vibe of the original system. A point to point reproduction sized for Eurorack, the Behringer 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