Option Knob, Inc. is a guitar effects accessory company based in Tuscaloosa, Alabama, founded by designer Chad Smith. The company is best known for the WingMan, a patented foot-controlled expression knob (U.S. Patent 7,709,726 B2) that replaces a stock pedal knob and lets players adjust effect parameters in real time with their toe. The WingMan ships with two interchangeable shaft inserts — Classic for standard potentiometer shafts and Boutique for the larger shafts found on many hand-built pedals — and is sold in eight colors as part of the Color Guard line, plus a glow-in-the-dark variant called the GloKnob.

The brand operates under the WingManFX storefront and also produces the Danger Zone, an analog tremolo/phaser pedal with two integrated WingMan-style foot-control knobs and a blend control between the two effects. Earlier generations of the knob were marketed simply as the OKnob before the WingMan rebrand and redesign, which introduced a smaller wing footprint, pointed tips for better foot grip, and a reinforced shaft.

Option Knob won Best in Show for Best Add-on or Accessory at the 2017 Summer NAMM convention, which raised the product's profile with major retailers including Musician's Friend and zZounds. The product occupies a specific niche in the pedalboard accessory market: hands-free, on-the-fly parameter tweaking without requiring a dedicated expression pedal or MIDI controller.

Option Knob has 2 products cataloged on Equipboard, including Effects Pedal Accessories.