FUQT

Gubtek - FUQT: Low-pass Filter and Resonance Distortion

FUQT is a fully analog, 4-pole, -24dB/octave low-pass filter with dynamic resonance distortion. It can transform tame signals into bold, unpredictable textures or serve as a sweet 'n fat LPF.

This module features input and output VCAs, attenuverters for all parameters, and maintains bass frequencies even with high resonance due to the absence of Q passband attenuation.

We stumbled upon the FUQT parameter by accidentally connecting points incorrectly during the prototyping stage. This happy accident produced a crazy distortion the likes of which we hadn’t heard before. The FUQT parameter introduces input-responsive resonance distortion, adjusting its behavior based on the input signal. This causes the frequency control to exhibit an effect akin to sample rate degradation, sweeping through accentuated harmonics in a stair-stepped manner and dynamically shaping the sound in response to the incoming audio.

A pre-filter input gain switch allows for quick changes in distortion intensity, easily altering the module’s character. FUQT also doubles as a sine or pulse-like wave VCO, capable of self-oscillation with temperature-compensated v/oct tracking, spanning at least two octaves.

Features
Fully analog, 4 pole -24db/octave LPF

Dynamic resonance distortion - akin to sample rate degradation

No Q passband attenuation - maintain bass frequencies with high resonance

Input gain switch for pre-filter distortion

Self oscillates sine or pulse-like wave

Temperature compensated v/oct tracking over at least 2 octaves

Input and Output VCAs

CV control with attenuversion for Cutoff Frequency, Q/Resonance, Input VCA, Output VCA, and FUQT

Bipolar output LED indicator

Reverse power protection

https://www.gubtek.com/modules/p/fuqt