Open Box Universal Audio UAFX Knuckles '92 Rev F Dual Rec Amplifier Effects Pedal Level 2 Silver 197881379025

The Knuckles ‘92 pedal perfectly replicates the green, orange and red channels of the original amplifier, offering a wide tonal range from crystal-clear cleans to bone-crushing distortion. Whether you want to dial in the tight, punchy rhythms of punk or the complex, aggressive leads of metal, this pedal has you covered. It also lets you experiment with EL-34 or 6L6 power tubes and switch between silicon and tube rectifiers to achieve the perfect tone and response.

Built-in Boost and Noise Gate for Tight, Articulate Playing

Equipped with a TS-style overdrive, the Knuckles ‘92 allows you to push the front end of the amp for tight, focused high-gain tones with midrange emphasis. The integrated preamp boost is perfect for modern metal, while the built-in noise gate ensures clean, noise-free performance even at extreme gain settings. Whether you're chugging through heavy riffs or shredding solos, this pedal delivers clarity and precision with every note.

Six Classic Mic/Speaker Pairings for Studio-Quality Sound

The Knuckles ‘92 includes six classic mic and speaker pairings that have been used on countless iconic records. These options let you experiment with a variety of tonal textures, from the punchy, in-your-face sound of punk rock to the deep, growling tones of metal. The pedal captures the essence of playing through a legendary high-gain amp, giving you full control over your sound in any setting.

Customize and Save Tones With the UAFX App

Take your tone customization to the next level with the UAFX mobile app, which allows you to tweak hidden controls, save boost and noise gate settings, and switch between output tubes and rectifier modes. The app also includes artist presets designed by the guitarists of Korn, Nevermore, and Arch Enemy, so you can instantly dial in pro-level tones. Whether you're crafting your signature sound or exploring iconic tones, the UAFX app makes it easy to refine and save your perfect setup.

UAFX 2.0 Firmware Update

Launching November 11, 2025, the UAFX 2.0 firmware update delivers a major performance upgrade to Universal Audio’s two-button pedals, unlocking deep MIDI integration, enhanced footswitch control, and streamlined app connectivity. Players can now select from four new footswitch modes—Live/Preset AB, A/Bypass + B/Bypass (Tour Mode), A/B–C/D and Boost + Live/Preset—ideal for live “channel-switching” workflows. The update introduces 128 recallable presets via MIDI Program Change, real-time parameter control through MIDI CC messages, and MIDI beat clock sync for time-based effects, including the Starlight Echo Station, Astra Modulation Machine, Galaxy ’74 Tape Echo & Reverb and Del-Verb Ambience Companion. Bluetooth connectivity has been rebuilt from the ground up for increased reliability, while a new wired USB connection enables direct app control from iOS or Android devices. USB MIDI support further enhances expression, preset switching and clock sync capabilities, making it easier than ever to integrate UAFX pedals into modern performance rigs. All updates are free and compatible exclusively with dual-footswitch UAFX models.

The UAFX Knuckles ‘92 Rev F Dual Rec Amplifier pedal delivers the raw power and aggressive tones that defined punk, alt-rock, and metal from the 1990s onward. Modeled after the legendary 1992 Rev F Dual Rectifier amplifier, this pedal brings the signature sound of bands like Foo Fighters, Incubus, Dream Theater and Nevermore right to your pedalboard. With six classic mic/speaker pairings, a built-in TS-style overdrive and an integrated noise gate, the Knuckles ‘92 provides everything you need to achieve the genre-defining tones that shaped an entire era of music.