STG Soundlabs is a modular synthesizer module manufacturer founded by Eric Williamson, who performs and operates the brand under the alias "Suit & Tie Guy." Based in the Chicago area, the company builds analog modules in both Eurorack and 5U / MU (Moog/Dotcom) formats, with a design philosophy that favors generous front-panel layouts and tactile usability over high-density packing.

The lineup spans utility and signal-processing modules alongside more idiosyncratic designs, including the Sea Devils Filter, the Post Lawsuit Filter, a Wave Folder based on the Haible diode topology, an Envelope Generator, mixers, VCAs, and clock utilities such as the .DIV clock divider and the .COM module. Williamson also acquired the muSonics name and used it to release The Vanilla Synthesizer, a 5U instrument that pays homage to the original muSonics circuit designs.

Beyond module building, Williamson is the founder and host of Knobcon, the annual synthesizer convention held in the Chicago area, which has helped tie STG Soundlabs closely to the broader American modular synth community.

STG Soundlabs has 6 products cataloged on Equipboard, including Modular Synthesizers. Their gear is featured by 3 artists, with the strongest followings in Electronic and Rock. Notable users include Deadmau5, Richard Devine, and Surachai.