Retro Mechanical Labs (RMLfx) is a boutique builder of distortion, fuzz, and filter effects, producing hardware in both guitar pedal and Eurorack modular formats. The company was founded by Alex Novo and is based in Portland, Oregon, operating at the intersection of guitar effects and modular synthesis.

The lineup centers on high-gain, character-forward distortion circuits and analog filters, often with unconventional modifications and sound-design features like feedback loops and oscillation. Flagship products include the Electron Fuzz Custom (and its EFC Mini and EFCcv Eurorack variants), the 432K Overdrive/Distortion, the Mig Fuzz, and the Hyde DF resonant filter, along with utility gear such as the GPI Guitar Pedal Interface and a Rotary Patch Box.

RML has built a reputation among experimental guitarists, noise and drone artists, and modular synth users for pedals that go beyond conventional fuzz tones into aggressive, gated, and oscillating textures. The brand is regularly covered on boutique pedal outlets and stocked by specialty retailers including Perfect Circuit and Reverb.

Retro Mechanical Labs has 3 products cataloged on Equipboard, including Fuzz Effects Pedals, Filter Effects Pedals, and Overdrive Effects Pedals. Their gear is featured by 6 artists, with the strongest followings in Rock, Electronic, and Metal. Notable users include Mick Gordon, Aaron Turner, and Francisco Durán.