A loud, aggressive and experimental device which consists in 2 effects in 1 pedal unit, the URLA is a CMOS fuzz in front of a synth-based dual resonant filter.

CMOS fuzz

Compared to the transistor based fuzz circuits (both germanium or silicon), in a CMOS fuzz there is no "in-between", no "dynamic range", no "vintage tone" or anything like that. There are just 1s and 0s, so no matter which kind of waveshape you put into it: the output will always be square wave with no adjustable gain neither since the square wave is as distorted as it can get.
The URLA obviously makes no exceptions and it provides an overdriven, brutal, glitchy and gated fuzz sound with a decay that dies abruptly (but still allowing to sustain each note thanks to a bass boost stage that they put at the very beginning of the signal path).
It offers 2 controls: VOLUME and BLEND.

DUAL RESONANT FILTER

This is the second effect placed in the internal signal chain of the URLA and it consists in a faithful replica of the analog filter section of the glorious Korg MS-20, all times favorite vintage monophonic synthesizer.
It's an HIGH PASS filter connected in series with a LOW PASS one, both adjustable with their relative controls of CUTOFF and PEAK. Also, they added a dual potentiometer to control the VOLUME of both, which is pretty useful in order to dial with other output levels in chain (including the internal FUZZ placed in front).