There is a chip inside the Caroline Guitar Company Kilobyte Lo-Fi Delay that was never meant to be here. The PT2399 was designed for karaoke machines and children’s toys — cheap, cheerful, and audibly compromised past a few hundred milliseconds. Half the boutique pedal industry spent the 2010s trying to hide that fact, filtering and smoothing the little Princeton Technology chip until it could pass for a bucket-brigade analog delay in a dark room. Caroline, working out of a small shop in Columbia, South Carolina, went the other way entirely. They found the chip’s ugly zone and built a pedal that lives in it.
That decision is the whole story of the Kilobyte. It arrived in 2013 as a Kickstarter-funded delay from a company barely three years old, it stayed in the line for over a decade, it turned up under the feet of a jam-band bassist playing arenas and a Raconteur producing records in Nashville, and in 2025 it got a full-scale successor. Almost nothing about it is convenient. Everything about it is deliberate.
Where the Kilobyte Came From
Caroline Guitar Company was founded in 2010 in Columbia, South Carolina, by Philippe Herndon, operating under the self-mocking banner of a “small batch distortery™.” By late 2012 the company had a reputation for loud, opinionated dirt boxes — the Wave Cannon, the Olympia, the Icarus — and one recurring customer question: when are you going to build a delay?
The answer came via Kickstarter. The campaign, titled “We want the Caroline Kilobyte delay pedal!”, ran from 4 January to 18 January 2013 — a fourteen-day window — and closed with $14,266 pledged against a $5,000 goal from 87 backers. That is roughly 285 percent of target, and it was filed on Kickstarter under Product Design rather than Music, which tells you something about how Caroline saw the object.
By March 2013 the pedal was on the floor at Winter NAMM in Anaheim, where Premier Guitar‘s Shawn Hammond filmed a booth demo published on 5 March 2013. Caroline’s own Kilobyte FAQ page went live on 9 July 2013, which is the practical date-anchor for general retail availability. Within a year Herndon was describing it as “our most successful product of the last year” — a delay pedal outselling the drive pedals the company had been built on.
The name is a joke that ages well. A kilobyte is a laughably small amount of data. Naming your delay after it is a promise that you are not selling fidelity.
How the Circuit Actually Works
Caroline are unusually direct about this, and it is worth quoting the shape of their own answer. Asked point-blank whether the Kilobyte is an analog delay, the company says no: an analog delay uses a bucket-brigade chip, and the Kilobyte uses a “low fidelity, bandwidth reduced PT2399 digital delay chip” for the repeats. What makes it feel analog is everything wrapped around that chip.
The signal path splits at the input. Your dry guitar signal hits a high-impedance unity-gain buffer and splitter and goes straight to a summing amplifier — untouched, unclocked, never digitised. The other half of that split runs into an analog preamp capable of up to +21 dB of boost and overdrive, and then into the delay chip. The two paths only meet again at the summing amp, where the delay level control sets how loud the repeats sit in the blend.
That architecture explains the pedal’s entire personality. The dry note stays clean and present no matter how hard you push. The repeats get driven, filtered, band-limited and smeared. Plenty of players have insisted on hearing it that the Kilobyte must be analog; Caroline’s position is that the warmth is real, the mechanism just isn’t.
The same architecture also explains the noise. The PT2399 is specified for roughly 300 ms of delay; push it further and total harmonic distortion climbs sharply. Caroline’s response was not to limit the control range but to hand you the whole thing and warn you in writing. Past noon on the delay-time knob you get white noise, speaker rub, snare rattle, phonograph scratch — Caroline’s own list — and the company is explicit that it is not there to “nanny-state” you into only the pleasant sounds.
Specifications
The Controls, One at a Time
Level
This is the volume of the repeats against your dry signal, not a wet/dry blend in the conventional sense. Caroline set unity so that with Level at noon and Attack all the way down, the repeats sit level with the original note. Everything above noon is the repeats getting louder than you.
Attack
The most misunderstood knob on the pedal, and the one that makes it a Caroline rather than a generic PT2399 box. Attack is the gain of the analog preamp feeding the delay chip, and it is capable of up to +21 dB. It does not touch your dry signal at all. What it does is drive the repeats — from gently thickened, through gritty and compressed, to a saturated smear that behaves more like a parallel fuzz with a delay attached. Because you are adding gain to the wet path, the pedal also gets louder overall as you turn it up, which is why Caroline’s own advice is to pull the Level down as you push the Attack.
Delay time
Caroline’s guaranteed number is “over 500 milliseconds,” and they are refreshingly candid about why they will not print an exact figure: there are tolerances in the delay chip itself and as much as 20 percent variation in the potentiometer. Units clocked in Columbia ran from 524 ms at the low end into the low 600s, and the company reports hearing of owners getting as much as 815 ms. In other words, no two Kilobytes have quite the same ceiling — a genuinely unusual admission from a manufacturer, and a real ownership fact rather than marketing colour.
Summation
Feedback, or regeneration in other builders’ language. Low settings give you a couple of degrading slaps; high settings pile the repeats up until the pedal self-oscillates. Because each pass runs back through the band-limited chip and the Attack preamp, repeats do not simply fade — they lose bandwidth and gain grit as they go, which is the closest thing the Kilobyte has to a tape emulation.
Tacos
Yes, really. Tacos is a modulation control that gently varies the amount of pitch shifting and detuning in the repeats, and it exists because the Kickstarter campaign overperformed. Caroline added it as an unplanned bonus feature, developed with Jack DeVille of Mr. Black Pedals — who had been contracted for the original PCB layout — and named it after the tradition of a sports team winning so lopsidedly that the fans get free tacos. Kickstarter backers got it as a fifth external knob. Standard retail units of the first generation hid it as an internal trimpot; Caroline offered a paid conversion, and also published instructions for drilling your own 1/4″ access hole in the backplate so you could reach the trimpot with a screwdriver.
Havoc
Every Caroline pedal with a momentary switch does something different with it, and on the Kilobyte, Havoc is a high-pass filtered runaway oscillation. Hold it and it overrides your Summation setting entirely, launching into infinite, escalating repeats with the low end pulled out so the pile-up stays audible instead of turning to mud. Release it and the effect returns to wherever your knobs were. It is not a tap-tempo switch and it never was.
Why There Is No Tap Tempo
This is the single most common complaint about the Kilobyte and the one Caroline answered most clearly. Their reasoning: because the chip is noisy at long delay times and gritty even at short ones, the design is not suited to the kind of “lock step, perfectly lined up dominoes” delay that tap tempo exists to serve. They went for a smeared, degraded sound and spent the design budget on other ambient features instead. Herndon closed one 2014 blog post by telling the tap-tempo askers to leave the tapping to Gregory Hines — then immediately hinted it was “a discussion about another pedal design one day.”
Eleven years later that other pedal arrived.
The Two Generations — and How to Tell Them Apart
In April 2014 Caroline published an unusually transparent blog post explaining three changes to the Kilobyte, framed explicitly as a response to a TED talk about honesty and a stated wish to be candid in an industry where they saw “a LOT of misleading or untruthful behavior.”
Change one: surface-mount components. The original Kilobytes were built with full-size through-hole parts, hand-populated and either hand- or wave-soldered. That process had become too slow and too expensive, and it was creating backlogs on Caroline’s hand-built drive and fuzz pedals. Herndon admits he held his breath building the first SMD prototype — through-hole being “an article of tone faith” in boutique circles — then took it to a gig and had one of the best nights of playing in twenty years.
Change two: relay switching. The redesigned board was done in collaboration with Jon Cusack of Cusack Music, and it brought in Cusack’s silent relay-based switching system. It is still true bypass; the difference is that the switching is electronic rather than mechanical.
Change three: Tacos moved outside. Rather than make the popular external-modulation mod harder, Caroline made it standard.
So: original generation — four knobs, Jack DeVille board design, through-hole, 3PDT mechanical switch, roughly the first 470-odd pedals built. SMD generation — four knobs plus a small trimpot in the centre of the face, Jon Cusack board and switching. Caroline’s own verdict on which to buy was characteristically blunt: “Either way you go, you win.” They also committed to warranty-servicing the 3PDT switch on original units for the life of the product.
Finish colours are a separate axis and carry no sonic difference. Black-and-gold sparkle went to Kickstarter backers and other advance customers who paid a premium; a lighter Mercedes blue with white graphics was a limited retailer run; Kingsport Grey, a cool gun-metal, is the standard. Caroline’s answer to people hunting the rare colours is worth keeping in mind for any small-builder pedal: “when we’re talking about small-batch, handmade boutique effect companies like ours, every pedal made is a limited edition.”
Famous Players — Independently Verified
Two users clear our evidence bar, which is a dated, published, model-specific source rather than a brand roster or a social-media board photo.
Dave Schools — Widespread Panic
Premier Guitar‘s Rig Rundown on Widespread Panic, written by Ted Drozdowski and published 12 September 2018, was filmed before the second of three nights at Nashville’s Ascend Amphitheater. The feature names “a Caroline Guitar Company Kilobyte Lo-Fi Delay” outright — and it is on the bass rig.
That is the editorial point. Schools plays a custom six-string Modulus Graphite called “Merle” and an Alembic Custom Series II Bird of Prey, through an Avalon VT-737sp tube preamp into a bi-amped d&b rig modelled on the band’s PA and inspired by Phil Lesh. His tech, Paul Agostino, says the pedal roster changes nightly, with only two constants: an MXR Bass Octave Deluxe and a Boss DM-2W Waza Craft delay. The rest of the Nashville selection ran a Catalinbread SFT, a Walrus Audio Luminary, EarthQuaker Devices The Depths, a Catalinbread Echorec, the Kilobyte, and a Carl Martin Octa-Switch on the floor.
A band-limited, high-pass-filtered, deliberately noisy delay on a rig built around clean low-end reproduction is a striking choice — and it makes sense precisely because the Kilobyte’s repeats lose bottom as they degrade. On bass, a delay that keeps full low end on every repeat turns the stage to porridge. One that eats its own low end on the way out does not. Whether or not that was the reasoning, it is the practical result.
Brendan Benson — The Raconteurs
Premier Guitar‘s “Pro Pedalboards 2021” round-up, published 25 February 2021, documents Benson’s Helwig Designs board: two Boss TU-3 tuners (one acoustic, one electric) feeding a Radial Tonebone JX-2 Pro amp switcher, a Whirlwind Rochester Orange Box Phase, a Catalinbread CB30, a Union Tube & Transistor NeverMORE boost, and two Caroline pedals — a Kilobyte Lo-Fi Delay and a Météore Millennial Edition Lo-Fi Reverb — all powered by a Strymon Zuma.
PG notes the board serves both his live work alongside Jack White in the Raconteurs and much of his studio production work. Two Caroline boxes on a board that otherwise runs to seven pedals is not a casual endorsement; it is a producer choosing texture generators he trusts on other people’s records. The Météore pairing is also the neatest illustration of Caroline’s house voice, since both pedals share the analog-dry-path philosophy and the momentary Havoc switch. We covered that reverb at rank 881.
What We Could Not Verify
Caroline maintain a public artists page listing roughly thirty-five names, and its own preamble describes them as “some of our noteworthy customers, by no means a full list.” Crucially, it carries no model attribution whatsoever — being on that page tells you someone owns a Caroline pedal, not which one. So while Nels Cline, Andy Summers, Yvette Young, Isaac Brock, Misha Mansoor, Jason Isbell, Laura Jane Grace, Butch Walker and others appear there, none of them can be credited with a Kilobyte on that basis. Summers is separately documented with the Météore in a 2017 Premier Guitar gear list; Isbell’s verified Caroline fact is the Wave Cannon. Neither is a Kilobyte citation.
Two verified users is a shorter list than we could have printed. It is also a true one.
Tone Recipes
The honest slapback
Delay time around 9:00, Summation at 8:00 for one to two repeats, Level at 12:00 for unity, Attack fully down. This is the Kilobyte at its most polite: short, warm, slightly dark repeats with none of the chip’s long-time noise. Excellent under a clean amp for rockabilly-adjacent parts where a pristine digital slap would sound sterile.
Broken tape machine
Delay time at 1:00 to 2:00 — deliberately into the noisy zone — Summation at 11:00, Level at 11:00, Attack at 10:00. The repeats arrive already degraded and each pass loses more top and bottom. This is the setting that fools people into hearing analog, and it is the pedal’s signature.
Parallel fuzz delay
Attack at 2:00 or higher, Level pulled back to 10:00 to compensate for the gain, delay time around 11:00, Summation at 10:00. Your dry note stays clean while a saturated ghost of it answers back. Try it with the guitar’s volume rolled down: the dry signal cleans up and the repeats stay filthy, which is not something a conventional overdrive-into-delay chain will do.
Dreamy detune
Set the Tacos trimpot to taste — a small screwdriver, gently — with delay time near noon, Summation at 12:00, Attack at 9:00. The pitch shifting and detuning smears the repeats into something chorus-adjacent. This is the setting that most rewards owners who did the external-knob conversion, because it is the one you actually want to adjust mid-set.
Havoc swell into a chord
Set your normal ambient sound, then hold Havoc through the last bar of a section. The high-pass filtering means the runaway climbs in the mids and highs rather than turning into a low-frequency roar, so you can release it straight into the downbeat of the next part without a mud clean-up. Caroline are honest that this can get loud; set your amp accordingly before the gig, not during it.
Knob names below use Caroline’s terms. Clock positions are starting points, not gospel — remember that delay-time ranges vary unit to unit.
How It Compares
Against the standard-bearer analog delays — the MXR Carbon Copy, the EHX Deluxe Memory Man, the Boss DM-2W and the Maxon AD999 — the Kilobyte is doing something structurally different. Those pedals degrade gracefully because bucket-brigade chips are inherently dark. The Kilobyte degrades because it is being asked to do something it was not built for, and the degradation is dirtier and less predictable. Notably, Dave Schools carries a DM-2W as a constant and adds the Kilobyte as a colour, which suggests they are not competitors.
Against clean digital workhorses — the Boss DD-3, the DD-8, the TC Electronic Flashback 2 — there is no contest and no overlap. Those are utilities. The Kilobyte is an instrument-shaped opinion.
Against the deep-menu ambient machines — Strymon TimeLine, El Capistan, Volante, Empress Echosystem, Meris LVX, Source Audio Collider and Nemesis — the Kilobyte offers no presets, no MIDI, no tap, and one sound. That is either a fatal limitation or the entire appeal, and which one depends on whether you enjoy making decisions with your hands. It is worth noting that Scott Holiday of Rival Sons ran a preset-less Caroline reverb in a rack alongside a Line 6 Helix and a Line 6 DL4; players with modellers still buy these.
Against other lo-fi and character delays — the Walrus Audio Arp-87, the JHS 3 Series Delay, the EHX Canyon — the Kilobyte’s differentiator is the +21 dB preamp on the repeat path. Very few delays let you overdrive the wet signal alone by that much. If you want a comparable “the effect has its own gain stage” experience elsewhere in the modulation world, the Chase Bliss Thermae and MOOD MkII occupy adjacent territory, and the Red Panda Particle V2 gets to broken-machine sounds by an entirely different digital route.
Within Caroline’s own line, the Kilobyte sits between the Shigeharu fuzz and the Météore reverb as the middle term of a house philosophy: analog dry path, an effect path with real gain in it, and a momentary Havoc switch that does something different on every model. On the Kilobyte, Havoc is filtered runaway oscillation. On the Météore it is hold, runaway or collapse depending on the Size knob. On the Shigeharu it is a parallel octave-up fuzz. Always check what Havoc does on the specific pedal.
The Kilobyte-2000
In 2025 Caroline released the Kilobyte-2000 Lo-Fi Tap Delay, described on their own site as “the final form of our flagship lo-fi delay pedal” and marketed with the line “The Twentieth Century’s Delay of the Future.”
The changes address essentially every limitation listed above. A new “invader” repeater preamp pushes the repeats up to five times harder than the original while still leaving the dry signal clean when dialled back. A Sharpness control sets the gain range and voicing of that preamp. Tap tempo is on board — the thing Herndon spent 2014 deflecting. So is trails bypass, and a subtle modulation, and a Havoc switch that now has its own intensity control. Most significantly for studio users, there is a dedicated effects loop that lets you put other pedals on the repeats only, or take a 100 percent wet output.
Caroline’s framing is telling: rather than clean the chip up or darken it to imitate analog, they say, “we made it nastier.” The KB-2000 ships at 18 oz with a 2 × 6 × 4 in shipping box, in Standard and Black Sparkle colourways.
Which raises the obvious question for anyone shopping now: does the original still make sense? Yes, if you want one sound and no menus, if you specifically want the four-knob layout, or if you find one at used-market money. The KB-2000 is the right answer if you need tap tempo, trails, or the wet-only loop. They are not the same pedal, and Caroline has not pretended otherwise.
Buying Guide
The original Kilobyte is out of production and lives on the used market. Some practical notes.
Identify the generation before you buy. Four knobs and nothing else on the face means an original through-hole unit with a mechanical 3PDT switch — one of roughly the first 470 built. Four knobs plus a small trimpot in the centre means the Cusack SMD board with relay switching. Both are true bypass. A fifth full-size knob means a Kickstarter-era unit or an aftermarket Tacos conversion.
Every unit is hand-signed. Final assembly, testing and signing happened in Columbia. A missing signature on the inside is worth asking about.
Delay ceilings vary. If maximum delay time matters to you, ask the seller to clock it. Caroline’s own measured spread ran from 524 ms to the low 600s, and outliers exist in both directions.
Colour is cosmetic only. Black-and-gold sparkle and Mercedes blue command a premium purely on rarity. Kingsport Grey sounds identical.
Test the Havoc switch under gig-level volume. A momentary switch is a wear item, and the runaway oscillation is the loudest thing the pedal does.
Living With It
Power is unfussy: any standard 9V DC pedal supply — Boss PSA-120, One Spot, Powerall, Pedal Power Plus — will run it, and Caroline explicitly say no funky adapter is needed. Note that this is one of the few areas where Caroline’s documentation is thinner than a modern buyer might like; they publish no enclosure dimensions for the original, and the current-draw figure is not printed on the legacy product material the way it now is for newer models. Give it a properly isolated output rather than daisy-chaining it behind a hungry digital pedal.
Placement is worth experimenting with. Because Attack is a real gain stage on the wet path only, running the Kilobyte before your overdrive produces a very different result from running it after — in front of a driven amp the repeats push the front end, which is chaos, but occasionally the good kind.
Owners of original units who want external Tacos have two documented routes. Caroline offered a paid conversion (historically $30 plus shipping), as did Resonant Amplifiers. The DIY route, which Caroline published themselves, is removing the backplate and drilling a 1/4″ hole centred 1″ from the left side and 2-3/8″ from the bottom, giving screwdriver access to the trimpot. They even suggested labelling it. Any of these voids nothing on the original warranty terms that matter — Caroline committed to warranty-servicing 3PDT switches for the life of the product — but as with any small-builder pedal, unofficial repair work is the usual exclusion, so check before you drill.
Frequently Asked Questions
Is the Caroline Kilobyte an analog delay?
No. Caroline are explicit that it uses a PT2399 digital chip for the repeats. What is analog is the dry path — a high-impedance unity-gain buffer straight to a summing amplifier — and the preamp that drives the delay chip. Many players hear it as analog anyway, which is the point.
Why does my Kilobyte get noisy past noon on the delay knob?
Because the PT2399 is designed for around 300 ms and distortion climbs steeply beyond that. Caroline chose to give you the full range and describe the resulting texture honestly rather than limit the control. It is a feature; if you do not want it, stay below noon.
What does the Havoc switch do?
It is a momentary high-pass filtered runaway oscillation. Holding it overrides the Summation control for infinite escalating repeats with the low end pulled out; releasing it returns you to your knob settings. It is not tap tempo.
Why doesn’t the Kilobyte have tap tempo?
Caroline’s stated reasoning is that a chip this noisy at long delay times and this gritty at short ones is not suited to precisely locked, in-time repeats. They optimised for smear instead. Tap tempo arrived on the Kilobyte-2000 in 2025.
What is the “Tacos” knob?
A modulation control that adds subtle pitch shifting and detuning to the repeats. It was an unplanned bonus feature added after the Kickstarter overperformed, developed with Jack DeVille of Mr. Black Pedals, and named after the tradition of a blowout win earning the fans free tacos. It is external on Kickstarter units and on later revisions, internal on early standard retail units.
Does the Attack knob affect my dry signal?
No. The dry signal is split off before the preamp and goes untouched to the summing amp. Attack only drives the repeats — up to +21 dB of it. It does raise overall output, so pull the Level down as you push it.
How long is the maximum delay time?
Caroline guarantee over 500 ms and decline to publish an exact figure, citing tolerances in the chip and up to 20 percent variation in the potentiometer. Their own measured units ran 524 ms to the low 600s; owners have reported as much as 815 ms.
Are the surface-mount Kilobytes worse than the through-hole ones?
Caroline say no, and published a long, unusually candid blog post in April 2014 explaining the change. The SMD board was designed with Jon Cusack and brought relay-based silent switching, still true bypass. Their own line was that either way you go, you win. Collectors pay for the first-generation boards; players generally do not report a sonic difference.
Which famous players have used one?
Two are documented by name in Premier Guitar: Dave Schools of Widespread Panic, on his bass rig in the 2018 Rig Rundown, and Brendan Benson of the Raconteurs, in the 2021 Pro Pedalboards feature. Caroline’s artists page lists many more names but attributes no models, so those cannot be counted as Kilobyte users.