Zlob F3DB Fixed Filter Bank Module
The Zlob Modular VC F3DB is a deep voltage-controlled fixed filter bank built for sound sculpting, distortion, feedback, and spectral processing. Short for Voltage Controlled Fixed Filter Feedback Distortion Bank, it features six analog filter bands spread across multiple octaves, giving modular users hands-on control over frequency shaping, multi-band processing, and aggressive tonal manipulation.
More than a standard fixed filter bank, the VC F3DB adds gain, clipping, feedback, self-oscillation, and VCAs for each band, turning it into a highly expressive performance module. It can be used for graphic EQ-style shaping, multi-band distortion, crude vocoding, envelope following, self-modulation, feedback patching, and even as a chaotic harmonic oscillator with no input signal.
Key Features
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16HP voltage-controlled fixed filter bank
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Six analog filter bands spread across multiple octaves
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Capable of graphic EQ-style shaping and spectral processing
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Built-in gain, clipping, feedback, and self-oscillation options
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Individual VCA control for each filter band
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Can be used for multi-band distortion and crude vocoding
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Envelope follower outputs for frequency-based modulation
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Overall feedback section for resonant, howling, and self-oscillating tones
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Can operate as a pseudo-chaotic harmonic feedback oscillator with no input
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Inspired by classic fixed filter bank concepts with active op-amp filter design
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Width: 16HP
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Depth: 45mm
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Power: +12V 75mA / -12V 75mA
What’s Included
The Zlob Modular VC F3DB is a powerful choice for Eurorack users who want a filter bank that goes far beyond tone shaping, offering distortion, voltage control, feedback, envelope extraction, and unstable sonic experimentation in one complex module.