Subdecay Noise Theory Parallel Wave-Folding Fuzz

The Subdecay Noise Theory is a fuzz pedal that runs two fuzz circuits at once: an analog voiced fuzz and a digital fuzz built on wave folding and wave shaping, blended together in parallel. Subdecay gives it 11 fuzz types, five knobs, a three-way edit mode switch, MIDI control and savable presets, which puts it closer to a compact multi-fuzz unit than a one-trick stompbox¹. Delicious Audio's Paolo De Gregorio described the core idea plainly: "the noise theory combines an analog and a digital fuzz circuit placed in parallel"².

What it does to your sound

Because the analog and digital sides run in parallel, the mix knob decides how much of each circuit you hear. The digital side works by folding and shaping the waveform of the signal, and the 11 modes cover what Guitar Pedal X's Stefan Karlsson called "both classic and more experimental sounds", with different texture at the start and end of the gain sweep¹. Subdecay's own page notes that the synthesizer mode will get "analog like, similar to old Casio CZ synthesizers, but it really shines with dirty in your face fuzzy tones"⁴, a reference to 1980s phase distortion synthesis.

Delicious Audio's buying guide sums up the design as "a dual fuzz that blends an analog and a digital fuzz, employing radical-sounding Wave Folding and Wave Shaping circuits" across 10 algorithms⁶. Subdecay's manual puts it in context: "The Noise Theory offers more options than your typical fuzz pedal, including multiple fuzz types, MIDI control, parallel" signal routing and more³.

The 11 fuzz types

The mode selector runs 0 to 10, and each number is a different way of mangling the waveform¹⁷:

Subdecay's product page explains the family relationships: Fuzz 5 is "Similar to Fuzz 3, but based on sine waves"⁴, and the single sided variants follow the same pattern against modes 3 and 4.

Controls, editing and presets

The five knobs each carry a second function depending on where the three-way edit mode switch is set, which is how a compact pedal reaches this many parameters¹⁸:

The manual describes PRE-COMP as controlling "pre-fuzz compression"³, and Delicious Audio notes that the hardware knobs cover "Tone, Compression, HPF and LPF and preset navigation"⁶. The edit switch positions are PRE, ANALOG and Shaper, and the mode selector doubles as the fuzz type and chorus-and-flange control in editing⁸.

Saving is done from the footswitch: hold it to save a preset for the current mode, and press again to exit the edit modes. The LED flashes while you are in an edit mode and again when a new preset has been saved¹. Subdecay lists 11 savable presets in total, one per mode⁴.

MIDI and the synth side

Alongside the fuzz algorithms, the pedal carries a built-in MIDI synthesizer. Subdecay's Brian Marshall put it this way in the company's synth pedal guide: "The Noise Theory Fuzz even has a built in MIDI synthesizer if you are into that sort of thing"⁵. For players already running MIDI on a board, that makes the Noise Theory a candidate among both fuzz and synth pedals, and the manual's MIDI implementation data was included in the printable PDF guide Subdecay published in April 2024³.

Price and availability

The pedal ships from 22 February 2024, at a list price of $199 USD¹. Subdecay's announcement gave the price as "$199 and equivalent" in other markets, so the UK figure follows the dollar price rather than being set separately¹.

What reviewers said

Karlsson's launch coverage described the pedal's range: "You get 11 different voicings out of this pedal - covering both classic and more experimental sounds"¹. That breadth of voicings, with different texture at the start and end of the gain sweep, is the picture the announcement gives of what the pedal offers¹.

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