4ms Nocto Loco (2000s)
A pedal that drops octaves, and with a flick of the "Loco" switch turns basslines into trembling, oscillating beasts.
Overview
Plug in, stomp down, and your guitar or bass drops three octaves, thick and seismic. That's the Nocto Loco's opening move. The real story starts when you hit the Loco switch and the pedal stops playing nice. It puts out a swirling, pulsing noise oscillation that rides the edge of control. It doesn't aim for pristine pitch tracking or studio-clean sub-bass. It wants to rattle cabinets, warp time signatures, and make your drummer nervous.
4ms Pedals built the Nocto Loco during the early 2000s - yes, the same people behind the later Eurorack work. It came out of a workshop near Chicago, where boutique stompboxes were hand-assembled, tested, and shipped. It landed in a niche but growing market of experimental guitarists, noise artists, and synth-minded tinkerers who weren't satisfied with overdrive or chorus. They wanted texture, movement, and unpredictability. The Nocto Loco packed octave division, tremolo, and noise synthesis into a die-cast aluminum box the size of a paperback. It wasn't mass-produced and it wasn't polished.
The design has two personalities. "Sane" mode gives you selectable octave drops (1, 2, or 3 octaves down), and the Unity switch layers in your dry signal for clarity, which helps when tracking complex chords or fast runs. Twist the Pulse knob and things get weird. A frequency-dependent tremolo kicks in, modulated by the pitch of your playing. Play a low E and you get slow, lurching pulses. Move up to the 12th fret and the tremolo speeds up, syncing to the note's frequency. It works as a responsive rhythm generator that turns every note into a rhythmic event.
Specifications
| Manufacturer | 4ms Pedals |
| Production Years | Early 2000s (exact start/end not documented) |
| Original Price | $240.00 (new, discontinued) |
| Power Supply | 9VDC (power supply included for USA orders) |
| Power Type | External adapter (center-negative) |
| Current Draw | Not specified in research |
| Enclosure | Die-cast 4" x 3" x 2" aluminum box |
| Bypass | True bypass via 3PDT stomp switch |
| LED Indicator | Red/green LED for effect status |
| Octave Division | 1, 2, or 3 octaves down |
| Unity Switch | Engages dry signal blend for definition |
| Pulse Speed | Selects modulation rate at 4, 5, or 6 octaves down (frequency-dependent) |
| Pulse Knob | Adjusts depth of tremolo effect |
| Volume Knob | Controls overall output level |
| Loco Switch | Activates noise oscillation mode, shifting sub-audible noise into audible range |
| Inputs/Outputs | 1/4" input and output jacks |
| Weight | Not specified in research |
| Kit Availability | DIY kit available (discontinued, $119.00) |
Key Features
Octave + Tremolo in One Dynamic Circuit
The Nocto Loco integrates its effects instead of just stacking them. The octave generator doesn't run separately from the tremolo. The Pulse speed is derived from pitch, so the modulation rate changes with the note you play. This isn't a random LFO wobbling your signal. It's a harmonic tremolo that locks into your playing. A low root note makes the pulse drag like a heartbeat after a sprint. Up the neck it flutters like a nervous tic. It rewards musicality more than it adds texture on top.
The “Loco” Switch: From Sub-Bass to Sonic Mayhem
Most octave pedals offer tracking, blend, maybe a fuzz. Engage the Loco switch on the Nocto Loco and the pedal stops generating pitch and starts generating chaos - shifting noise oscillations that ride just below and above the audible threshold, then explode into gritty, modulated static. It's not a standard fuzz or distortion. It's closer to a malfunctioning oscillator you've somehow harnessed. Musicians report it sounding "like a broken synth module possessed by a bass guitar." It's unpredictable, but it can feel intentional, even musical, when used with restraint. Layer it under a clean signal or let it dominate a solo passage.
True Bypass and Build Quality
Every Nocto Loco was hand-built, with components mounted directly to the enclosure and wiring done point-to-point or via PCB. The die-cast aluminum box shields the circuit from interference and feels indestructible on a pedalboard. The 3PDT true bypass leaves your dry signal untouched when the effect is off, which matters to anyone who hates tone suck. The red/green LED gives clear visual feedback. The included 9VDC adapter (for US orders) meant you didn't have to hunt down a compatible supply. It was built to last, assuming you didn't lose the power supply or fry the circuit with a reversed adapter.
Historical Context
The Nocto Loco arrived during a boom in boutique effects pedals, when small builders began experimenting beyond the standard overdrive and delay. Stompboxes from companies like Electro-Harmonix, Boss, and DOD had defined the 1980s and '90s, but by the early 2000s players wanted more character, more unpredictability, more personality. 4ms Pedals stepped into that gap. Each run of pedals had slight variations, and every unit was assembled by hand. The Nocto Loco wasn't designed to compete with the Electro-Harmonix POG or the DOD Meatbox. It was designed to ignore them.
It shared DNA with the growing modular synth scene, which is unsurprising given that 4ms would later pivot entirely to Eurorack. The frequency-dependent tremolo, the noise oscillation, and the emphasis on modulation over tone shaping all felt more like a synth module than a guitar pedal. Competitors like the Pigtronix Octave Machine or the EHX Superego offered layered textures, but none embraced chaos as openly as the Nocto Loco. It wasn't for everyone. Noise rockers, experimental bassists, and sonic explorers took to it.
Its legacy is also tied to the DIY movement. The release of the Nocto kit—a full build-it-yourself version—cemented its status as a hacker’s pedal. With online instructions and component lists, builders could assemble their own, gaining intimate knowledge of the circuit. This wasn’t just a product; it was an invitation to tinker. That ethos, more than any single feature, defined 4ms’s early identity.
Collectibility & Value
The Nocto Loco has been discontinued for years, and original units rarely appear on the market. When they do, prices range from $350 to $550, depending on condition, included accessories, and whether the original box and manual are present. Units with the original 9V adapter and documentation command a premium, especially among collectors who value completeness. The DIY kit versions are even rarer and typically don't sell as assembled units. Most were built by their owners, and few resurface.
Common failures include damaged input/output jacks from repeated plugging, cracked solder joints due to enclosure stress, and power supply issues, particularly if a non-center-negative adapter was used. The 3PDT switch is tough but not immortal, and repeated stomping can wear out the contacts over time. The most serious risk is power-related damage. Incorrect voltage or reverse polarity can fry the ICs, and replacement parts are not readily available. Owners report that once damaged, repair often requires sourcing vintage components or borrowing from donor units.
Before buying, test every function: engage each octave setting, toggle the Unity switch, sweep the Pulse knob across different notes, and hit the Loco switch. Listen for consistent tracking, clean bypass, and stable noise oscillation. Check that the LED works and that the enclosure isn't dented or warped, since that can stress internal wiring. Service manuals are scarce and community repair guides are limited, so buy working units only. A "for parts" unit is a poor bet unless you're already deep in the 4ms ecosystem.
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