List of distortion pedals#Marshall Bluesbreaker

While "distortion" is the technical term for the different sounds caused by signal clipping, distortion effects pedals—which act as small amplifier circuits—are typically further classified into fuzz, distortion, and overdrive, depending on the circuit design and how the waveform is affected.{{cite web |title=Overdrive vs. Distortion vs. Fuzz |url=https://lifestyle.jimdunlop.com/the-dunlop-distortion-guide/ |website=lifestyle.jimdunlop.com |publisher=Dunlop |access-date=17 March 2025}} Fuzz pedals came to the market first, with these pedals seeking to replicate the harmonic content generated by an amplifier being faulty or damaged. This sound is often characterized as harsh, with the waveform the most heavily affected of the three types, reaching nearly a square form. To create their effect, fuzz pedals use lo-fi transistors.

Conventional overdrives, like the Ibanez Tube Screamer, use diodes within the feedback loop of an op amp, so the signal does not fully distort or clip and results in a milder effect. This is known as "soft-clipping," or overdrive.{{cite web |title=What You Need To Know About Overdrive Pedals |url=https://thejhsshow.com/articles/what-you-need-to-know-about-overdrive-pedals |website=thejhsshow.com |publisher=JHS Pedals |access-date=17 March 2025}} The affected waveform maintains rounded peaks with the intent to both emulate and complement a driven tube amplifier. Some overdrives are meant to "color" the affected tone, while others are meant to be relatively transparent. When the diodes are placed at the end of the circuit, however, the entirety of the signal is clipped. This is known as "hard-clipping," or distortion, which has a more aggressive sound and dramatic effect on the underlying tone, with angular peaks in the affected waveform. Because overdrive and distortion both typically use op amps and diodes, the line between the two types can blur. The Klon Centaur, for example, is hard-clipping but considered a classic overdrive, while the MXR Distortion + and DOD Overdrive 250 Preamp have nearly identical (hard-clipping) circuits despite the opposing use of "Distortion" and "Overdrive" in their names.

Some overdrive pedals, like the early fuzzes, use transistors and therefore do not have soft- or hard-clipping circuitry. These transistors are arranged in stages, cascading into one another for a more saturated sound, in a similar fashion to an overdriven tube amp. Examples include the Boss Blues Driver and "amp in a box" overdrives like the Marshall JTM45-emulating Z.Vex Box of Rock.

{{Main article|Fuzz Face}}

File:Dallas Arbiter Fuzz Face.jpg

Arbiter Electronics released the first Fuzz Face in 1969, featuring a unique round metal housing inspired by a microphone stand and with the arrangement of volume knob, distortion knob, and logo intentionally resembling a face. The Fuzz Face's first production run lasted until 1976/77, then was reissued from 1986 until 1990. In 1993, Dunlop Manufacturing took over production and has continued to issue several varieties of the pedal. Jimi Hendrix popularized the Fuzz Face and was known to buy multiple copies at a time to identify the best ones; his pedal chain often consisted of a wah-wah pedal into a Fuzz Face, then into a Uni-Vibe.{{cite book|last1=Shapiro|first1=Harry|last2=Glebbeek|first2=Caesar|title=Jimi Hendrix: Electric Gypsy|year=1995|orig-year=1990|edition=New and Improved|publisher=St. Martin's Press|isbn=978-0-312-13062-6|url=https://books.google.com/books?id=JB1W2dn31rwC }} p. 689. Other notable users include Duane Allman,{{Cite web|url=https://www.uberproaudio.com/who-plays-what/392-duane-allman-guitar-gear-rig|title=Duane Allman Guitar Gear Rig|website=Uberproaudio.com|access-date=5 November 2023}} Stevie Ray VaughanHopkins, Craig. Stevie Ray Vaughan – Day by Day, Night After Night: His Early Years, 1954–1982. Backbeat Books; September 15, 2010. p. 327. {{ISBN|978-1-4234-8598-8}} Pete Townshend,{{Cite web|url=https://www.thewho.net/whotabs/gear/guitar/fuzzface.html|title=Dallas Arbiter Fuzz Face fuzz box | Pete Townshend's Guitar Gear | Whotabs|website=Thewho.net|access-date=5 November 2023}} Eric Johnson,{{cite web |url=http://www.modernguitars.com/archives/001025.html |title=Eric Johnson Interview |access-date=2007-10-23 |url-status=dead |archive-url=https://web.archive.org/web/20071022233005/http://modernguitars.com/archives/001025.html |archive-date=2007-10-22 }} Modern Guitars - Eric Johnson Interview and George Harrison."Get Back" by the Beatles; Apple, London, 1969"Beatles Gear" by Andy Babiuk and Tony Bacon; Backbeat, 2002

{{Main article|Big Muff}}

The Big Muff Pi (π), often known simply as the Big Muff, is a fuzz pedal produced in New York City by the Electro-Harmonix company, along with their Russian sister company Sovtek, primarily for use with the electric guitar. Released in 1969 and designed with an emphasis on long sustain compared to existing fuzzes, the Big Muff Pi was the first overwhelming success for Electro-Harmonix's line of pedals. Due to its reliability, its low price, and its distinctive sound, the Big Muff sold consistently through the 1970s and was found in numerous guitarists' pedal collections, including David Gilmour{{cite web| title= Welcome to the Machines| work= Guitar World| author= Tolinski, Brad| url= http://www.pinkfloydfan.net/t11634-Phil-Taylor-welcome-machines-guitar.html| date= September 1994| accessdate= 2011-07-29| archiveurl= https://web.archive.org/web/20110724013318/http://www.pinkfloydfan.net/t11634-phil-taylor-welcome-machines-guitar.html| archivedate= 24 July 2011| url-status= dead}} and Carlos Santana. The "sustained grind" of the Big Muff was later an integral part of the sound of many alternative rock bands through the 1980s and 1990s, being used extensively by the Smashing Pumpkins, Dinosaur Jr., NOFX, Bush and Mudhoney.

{{Main article|Maestro FZ-1 Fuzz-Tone}}

The Maestro FZ-1 Fuzz-Tone was the first widely marketed fuzz distortion guitar and bass effect. Introduced in 1962, it achieved widespread popularity in 1965 after the Rolling Stones guitarist Keith Richards prominent use of the FZ-1 on the group's hit, "(I Can't Get No) Satisfaction". Later in 1965, the design was slightly modified and designated as the model FZ1-1a. In the wake of the success of "Satisfaction," numerous recordings, mostly from 1960s garage rock and psychedelic acts, featured Maestro Fuzz-Tones on guitar. More significant design changes made after 1967 resulted in different renditions of the Fuzz-Tone released over the years. In the 1990s, Gibson re-issued the FZ-1a, but it was later discontinued.

{{Main article|Tone Bender}}

File:1966 VOX TONE BENDER FUZZ.jpg

Released in 1965, Sola Sound's Tone Bender was a re-creation of the popular Maestro Fuzz-Tone, but with more sustain and intended for the European market. For U.S. distribution, Vox released a version in 1967 based on Sola Sound's MK1.5 Tone Bender update, one of many the pedal went through. With different component values and transistors being used over the years, earlier variants are fuller sounding, while later ones are bright and cutting. Notable examples of the Tone Bender in use include Jeff Beck's sitar-like guitar solo on the Yardbirds' 1965 song "Heart Full of Soul" and Mick Ronson's guitar work on David Bowie's 1972 song "Moonage Daydream".{{cite web|last=Livingstone|first=Christian|title=Fifty Years of Filth: The Story of the Mighty Tone Bender Fuzz|url=https://www.premierguitar.com/gear/fifty-years-of-filth-the-story-of-the-mighty-tone-bender-fuzz|website=Premier Guitar|date=13 December 2018|access-date=5 February 2024}}

{{Main article|Univox Super-Fuzz}}

The Univox Super-Fuzz circuit was designed in the late 1960s by the Japanese company Honey, in the form of a multi-effect called the Honey Psychedelic Machine. Later on, Honey was acquired by Shin-ei, who produced the effect separately and imported it to the USA via Unicord, the parent company of Univox. The first Super-Fuzzes were made in 1968, and production continued until the late 70s.{{cite book|last1=Hughes|first1=Tom|title=Analog Man's Guide to Vintage Effects|date=2004|publisher=For Musicians Only Publishing|location=USA|isbn=0-9759209-0-1|pages=117, 119|edition=First}} The pedal is unique in that the full-wave rectification of the circuit produces an upper octave as well as a slight lower octave. This also gives the sound a lot of compression and a mild ring modulator effect. A second unique feature is a tone switch that engages a 1 kHz filter that "scoops" the mids, giving a fat, bassy tone.{{cite book|last1=Hughes|first1=Tom|title=Analog Man's Guide to Vintage Effects|date=2004|publisher=For Musicians Only Publishing|location=USA|isbn=0-9759209-0-1|page=25|edition=FIRST}}

{{Main article|Z.Vex Fuzz Factory}}

The Fuzz Factory, designed overnight in 1994, was the second pedal from Z.Vex-founder Zachary Vex. The design began with a collection of unique germanium transistors Vex purchased from a surplus store with the intent of creating a fuzz pedal similar to a Fuzz Face.{{cite web |last1=Dickson |first1=Jamie |title=25 years of the Z.Vex Fuzz Factory: how the iconic fuzz pedal was conceived during a single, feverish night in the '90s |url=https://www.guitarworld.com/features/25-years-of-the-zvex-fuzz-factory-how-the-iconic-fuzz-pedal-was-conceived-during-a-single-feverish-night-in-the-90s |website=guitarworld.com |publisher=Guitar World |access-date=9 December 2024}} While initially disappointed by the transistors' sound, Vex added a booster to the front of the circuit and the pedal went "haywire" with squealing and odd noises. Vex replaced the fixed-value resistors with pots to gain control over the sounds, leading to a layout of five-knobs—three of which he could not easily describe the function of. The local dealer Vex took the first Fuzz Factories to objected to the layout, feeling customers would be confused, but Vex insisted this would mean buyers could find their own sounds.{{cite web |last1=Hodgson |first1=Peter |title=How ZVEX effects went from a necessity to stay alive to one of the most renowned and beloved pedal companies |url=https://mixdownmag.com.au/features/studio-focus-damien-gerard-studios-2/ |website=mixdownmag.com |publisher=Mixdown Magazine |access-date=9 December 2024}} Dubbed a "masterpiece" by Guitar World for being intuitive yet "near-infinite in its tone-sculpting potential," the pedal's success established Vex as a pivotal figure in the popularization of boutique effects pedals.

{{Main article|Boss DS-1}}

Introduced in 1978, the DS-1 was Boss's first distortion pedal, and second pedal release overall, following the CE-1 Chorus Ensemble. The DS-1 uses two hard-clipping diodes for an aggressive edge, similar to the ProCo Rat, released the same year. This type of circuit became known as "distortion," as opposed to the soft-clipping "overdrive" of Boss's later overdrive pedals.{{cite web |last1=Lynham |first1=Alex |title=Boss DS-1W Waza Craft Distortion Review |url=https://www.guitarplayer.com/reviews/boss-ds-1w-waza-craft-distortion-review |website=guitarplayer.com |publisher=Guitar Player |access-date=31 July 2023}} The DS-1 uses a preamplifier instead of the conventional op-amp for a gritty, warm tone. When the original Toshiba TA7136AP preamp became scarce, the circuit was redesigned in 1994, introducing several "quirks"—lower volume levels, noise at higher gain levels, and a "waspy" edge due to higher frequencies not being filtered out. These issues led to the pedal being popular among modifiers.

The DS-1 is Boss's bestselling pedal of all time.

{{Main article|Boss HM-2}}

The Boss HM-2, first issued in October 1983, was manufactured in Japan until 1988, then in Taiwan until 1991.{{cite web |title=Boss shares images of new Waza HM-2W cosmetic prototype on Facebook |url=https://www.gearnews.com/boss-shares-images-of-new-waza-hm-2w-cosmetic-prototype-on-facebook/ |website=Gearnews |access-date=May 31, 2021}} It was designed to emulate the mid-range response of a Marshall stack.{{cite web |title=BOSS Cult Classics |url=https://rolandcorp.com.au/blog/boss-cult-classics |website=rolandcorp.com.au |access-date=May 31, 2021}} Achieving only moderate success in the glam metal scene, the pedal was discontinued in 1991; it was succeeded by the HM-3 Hyper Metal and MT-2 Metal Zone, the latter of which became a commercial success and top-selling pedal for Boss. Following its discontinuance, the HM-2 developed a cult following in the heavy metal scene and is especially associated with Swedish death metal. In 2020, Boss renewed production of the pedal as the HM-2W, part of its Japanese-made, boutique-grade "Waza Craft" series.{{cite web |last1=Seah |first1=Daniel |title=Here's a First Look At The Boss Hm-2 Waza Craft Reissue |url=https://guitar.com/news/gear-news/boss-hm2w-waza-craft-first-look/ |website=guitar.com |access-date=May 31, 2021}}

{{Main article|Boss MT-2}}

File:Boss MT-2 Metal Zone.jpg

The MT-2 Metal Zone was released in 1991, following the discontinuation of the earlier HM-2, which failed to sell well during its production run, but was popular among death metal players. With the MT-2, Boss sought to appeal to that market with an improved pedal as death metal's popularity surged.{{cite web |last1=Horsely |first1=Jonathon |title=How the Boss MT-2 Metal Zone conquered the world and inspired a new generation of metal guitar players |url=https://www.guitarworld.com/features/boss-mt-2-metal-zone-legacy |website=guitarworld.com |publisher=Guitar World |access-date=31 July 2023}} The pedal's thick, saturated, tight tone{{cite web |last1=Laing |first1=Rob |title=Boss announces anniversary versions of the SD-1 Super Overdrive and MT-2 Metal Zone pedals |url=https://www.musicradar.com/news/boss-announces-anniversary-versions-of-the-sd-1-super-overdrive-and-mt-2-metal-zone-pedals |website=musicradar.com |publisher=Music Radar |access-date=31 July 2023}} and the extreme sounds the pedal was able to produce thanks to its powerful EQ controls made the MT-2 divisive both upon its release and throughout its ongoing production. Despite this, the pedal has found fans in metal and other genres, including Prince and Joe Bonamassa.{{cite web |last1=Parker |first1=Matt |title="This is going to sound really f**king strange": Joe Bonamassa says his go-to BOSS dirt pedal is the Metal Zone – here's why the blues ace rates the metal monster |url=https://www.guitarworld.com/news/joe-bonamassa-boss-metal-zone-mt-2 |website=guitarworld.com |publisher=Guitarist |access-date=1 December 2024}}

The Metal Zone has sold over a million units, making it the company's best-selling pedal behind only the DS-1.

The Shredmaster was the high-gain model of a trio of pedals—including the Bluesbreaker and Drivemaster—released by Marshall in 1991, superseding the brand's first overdrive pedal, the Guv'nor.{{Cite web|url=http://www.pedalsandeffects.com/blog/2015/11/12/vintage-pedal-of-the-week-marshall|title=Vintage Pedal of the Week: Marshall|website=Pedals and Effects|date=12 November 2015 |language=en-US|access-date=2018-12-12}} While the Bluesbreaker and Drivemaster replicated the tones of specific Marshall amps, the Shredmaster was a distortion pedal and replaced the other two pedals' three-band EQ setup with controls for Bass, Treble, and Contour, the last of which altered the character of the midrange while enhancing low and high frequencies. With poor sales, the trio was discontinued one year after their release.{{cite web |url=https://marshall.com/live-for-music/history/history-of-pedals-part-2 |website=marshall.com |publisher=Marshall Amplification |title=History of Pedals – Part 2 |access-date=2023-10-01}} Radiohead guitarist Jonny Greenwood is often cited as the Shredmaster's most famous player.{{Cite web|last=McStarkey|first=Mick|date=2021-11-05|title=How to play the guitar like Radiohead's Jonny Greenwood|url=https://faroutmagazine.co.uk/how-to-play-the-guitar-like-radiohead-jonny-greenwood/|access-date=2022-02-06|website=Far Out Magazine|language=en-US}}

Marshall reissued the Shredmaster, Bluesbreaker, Drivemaster, and Guv'nor in 2023 as its Vintage Reissue series, in response to the pedals having become sought-after vintage gear despite their initial unpopularity.{{cite web |last1=Horsley |first1=Jonathan |title=The Guv'Nor, Drivemaster, Bluesbreaker and Shredmaster return as Marshall officially reissues its famous vintage stompbox range |url=https://www.musicradar.com/news/marshall-vintage-reissue-pedals |website=MusicRadar |date=24 February 2023 |publisher=Future Publishing Limited Quay House, The Ambury, Bath BA1 1UA. |access-date=June 5, 2023}}

{{Main article|MXR Distortion +}}

MXR scored its first success with the Phase 90 and followed quickly with a trio of 1974 releases, including the Distortion +. MXR's pedals were notable for their small footprint, as effects pedals were typically housed in large enclosures at the time, and durability, since MXR was initially founded to address the issue of other manufacturers' pedals' unreliability. The Distortion + has found a wide range of fans, like Randy Rhoads in his work with Ozzy Osbourne,{{cite web |last1=Gill |first1=Chris |title=Out of the Box: Guitar World Celebrates the Time-Honored History of MXR Effect Pedals |url=https://www.guitarworld.com/magazine/out-box-guitar-world-celebrates-time-honored-history-mxr-effect-pedals |website=Guitar World |publisher=Future plc |accessdate=2018-07-31}} Jerry Garcia of the Grateful Dead, Bob Mould of Hüsker Dü,{{cite web |last1=Cochran |first1=Kevin |title=Gear Blog: Bob Mould |url=http://acltv.com/2013/01/25/gear-blog-bob-mould/ |website=Austin City Limits |publisher=KLRU-TV, Austin PBS |accessdate=2018-08-01}} Dave Murray of Iron Maiden,{{cite web |last1=Bosso |first1=Joe |title=Iron Maiden: Out of Thin Air |url=https://www.premierguitar.com/articles/23207-iron-maiden-out-of-thin-air |website=Premier Guitar |publisher=Premier Guitar Magazine |accessdate=2018-07-31 |page=2}} and Thom Yorke of Radiohead.

{{Main article|Pro Co RAT}}

Developed in 1978 with mass production beginning a year later,{{cite web |last=Williams |first=Stuart |title=Pro Co Reissue '85 Whiteface RAT |url=https://www.musicradar.com/reviews/guitars/pro-co-reissue-85-whiteface-rat-267601 |work=MusicRadar |publisher=Future Publishing |accessdate=29 January 2012 |date=2 August 2010}} the Pro Co Rat was the first mass-produced distortion pedal. In the Rat, Pro Co's engineers sought to improve upon the earlier Fuzz Face and ultimately designed a pedal with, as Guitar World wrote, a "hard, aggressive sound and tight, focused clipping" that set the template for modern distortion circuits.{{cite web |last1=Horsley |first1=Jonathon |title=Best distortion pedals: the top 11 high-gain stompboxes for guitarists |url=https://www.guitarworld.com/features/the-best-distortion-pedals |website=guitarworld.com |publisher=Guitar World |access-date=11 May 2024}} Pro Co has released numerous versions of the Rat since its initial release, and its enduring popularity has spawned numerous clones and tributes from other pedal manufacturers like JHS Pedals and Wampler Pedals.

The King of Tone, released in 2005, was designed by former software engineer Mike Piera to create an improved version of the then-discontinued Marshall Bluesbreaker pedal. A two-sided pedal with independent controls and internal DIP switches to choose between boost, overdrive, and distortion modes, Piera started building the pedals by hand in Bethel, Connecticut and selling them online under the moniker "Analog.Man."{{cite web |last1=Busemeyer |first1=Stephen |title=In Bethel, an analog man builds guitar pedal icons |url=https://ctmirror.org/2024/07/29/bethel-ct-analog-man-guitar-effects/ |website=ctmirror.org |publisher=Connecticut Mirror |access-date=31 July 2024}} The King of Tone initially sold slowly, but quickly developed a following after Piera appeared on the YouTube channel "That Pedal Show" in 2017. Orders soon reached 200 per day—far more than Piera could keep up with—and the King of Tone developed a famously years-long waiting list, while prices on the used market far exceeded the cost of a new pedal. To satisfy demand, Piera developed a single-sided variation, the Prince of Tone, that would be manufactured in China, but still in limited numbers that sold out quickly. In 2022, Analog.Man partnered with MXR to release a smaller-format, mass-produced version, the Duke of Tone, which in 2023 became MXR's bestselling pedal.

Vintage Guitar dubbed the King of Tone one of a few "holy grail" overdrives.{{cite web |last1=Jordan |first1=Oscar |title=Analog Man's King of Tone |url=https://www.vintageguitar.com/39251/analog-mans-king-of-tone-overdrive/ |website=vintageguitar.com |publisher=Vintage Guitar |access-date=10 May 2024}}

In 1995, Boss released the BD-2, an overdrive pedal aimed at blues players who sought to add distortion while maintaining their amp's signal clarity and dynamics.{{cite web |last1=Brakes |first1=Rod |title=Boss analog overdrives: what you need to know about the iconic drive pedals |url=https://www.guitarworld.com/features/boss-analog-overdrive-pedals |website=guitarworld.com |publisher=Guitar World |access-date=31 July 2023}} At the time, blues was experiencing a resurgence thanks to Eric Clapton and Gary Moore. The pedal has a clear, punchy tone and features a flatter EQ-curve for a more amp-like tone than similar pedals, like the Ibanez Tube Screamer,{{cite web |last1=Robertson |first1=Daryl |title=Ibanez Tube Screamer vs Boss Blues Driver: which is better? |url=https://www.guitarworld.com/features/ibanez-tube-screamer-vs-boss-blues-driver |website=guitarworld.com |publisher=Guitar World |access-date=31 July 2023}} while at higher gain levels it takes on an "edgy, grinding" quality. The Blues Driver is also a common platform for modifications, with boutique pedal makers like Robert Keeley and Josh Scott offering popular modding services. Boss went on to collaborate with Scott on the Boss JB-2 Angry Driver, which combines the BD-2 and JHS Angry Charlie circuits into one pedal.

Notable players who use the BD-2 include Tom Morello of Rage Against the Machine and Billie Joe Armstrong of Green Day.

File:BOSS OD-1.jpg

With the 1977 release of the OD-1 OverDrive, Boss sought to offer guitarists a way to achieve the sound of power amp distortion at lower volume levels on any amp, as the advent of hard rock popularized heavily distorted tones, while the first master volume amplifiers had only recently become available. The OD-1's "overdrive" referenced the pedal's asymmetrical-clipping, tube-like distortion, which stood in contrast to the brash sound of "fuzz" pedals on the market.{{cite web |last1=Colic |first1=Jamie |title=Gear Icons: Boss SD-1 Super Overdrive |url=https://mixdownmag.com.au/features/gear-icons-boss-sd-1-super-overdrive/ |website=mixdownmag.com |publisher=Mixdown Magazine |access-date=9 May 2024}} The OD-1's layout was simple—with only "Level" and "OverDrive" controls. It was an immediate success, paving the way for future compact overdrive pedals. Within a few years, however, the pedal's voicing was considered overly "sweet," as rock music became more aggressive. The fixed frequency also limited its versatility. With the surging popularity of the OD-1-influenced Tube Screamer and its addition of a tone control, Boss began including a "Tone" knob on its overdrive-style pedals with the 1981 SD-1 and the OD-1 was discontinued in 1985. Boss continued the OverDrive line with the four-knob OD-2 Turbo OverDrive, produced from 1985 to 1995, and subsequently the three-knob OD-3, which is still in production.

The Super OverDrive was released in 1981 as Boss's second overdrive pedal, adding a tone control to the earlier OD-1 design while refining the circuit for more gain and aggression in its voicing. The SD-1 retained its predecessor's asymmetrical clipping and inherent midrange-focus, but its circuit was altered, seeking to replicate the effect of slightly mismatched output tubes in an amplifier, which was thought to enhance an amp's character and "cutting power."{{cite web |last1=Hunter |first1=Dave |title=For those about to rock: we salute the Boss SD-1 Super OverDrive which has wowed lead guitarists for over 40 years with its jagged, granular tone |url=https://www.guitarplayer.com/gear/in-praise-of-the-boss-sd1-super-overdrive-pedal |website=guitarplayer.com |publisher=Guitar Player |access-date=5 January 2025}} The clipping's updated placement earlier in the circuit also introduced a "slightly jagged, granular drive tone" that helped the affected guitar tone stand out in a mix. With these changes, the SD-1 was quickly embraced by the growing hard rock and heavy metal subgenres, with guitarists frequently using it to boost already-overdriven amplifiers like the Marshall JCM800 into higher-gain sounds. The pedal is notable as a staple budget offering—frequently chosen as a guitarist's first overdrive{{cite web |last1=Watts |first1=Michael |title="I could have done 90 per cent of my career with an SD-1": why the BOSS overdrive has been the pro guitarist's secret ingredient for 40 years |url=https://guitar.com/features/interviews/why-the-boss-sd-1-overdrive-pro-guitarists-secret-ingredient-40-years/ |website=guitar.com |publisher=Guitar Magazine |access-date=31 July 2023}}—that has remained widely popular among professional rock players, with fans like Kirk Hammett, Jonny Greenwood, Mark Knopfler, Prince, and The Edge. In 2021, Boss released a 40th anniversary edition of the pedal, with the original circuit having remained unchanged since its introduction. Guitar dubbed the pedal one of only a handful to ever achieve "truly iconic status."

The Overdrive 250 Preamp, released in the 1970s as part of DOD Electronics' initial lineup of pedals, was originally a slight circuit variation of the Distortion+ by MXR, DOD's most direct competitor in the US market.{{cite web |last1=Lynham |first1=Alex |title=DOD Overdrive Preamp 250 review |url=https://www.guitarworld.com/reviews/dod-overdrive-preamp-250-review |website=guitarworld.com |publisher=Guitar World |access-date=23 June 2024}} The two pedals differed primarily in the 250 Preamp's use of silicon diodes instead of the germanium diodes of the Distortion+, which made a significant difference in the two pedals' tone and feel given the overall simplicity of their designs. Following DOD's acquisition by Digitech in 1990, the 250 Preamp was reissued several times, including with the JRC4558 op-amp popularized by the Tube Screamer. Digitech was later bought by Cor-Tek, the parent company of Cort Guitars, and in 2013 the 250 Preamp was reissued once again, this time as a more faithful replica of the original design.

With the 1996 release of the Full-Drive 2, Fulltone had the industry's biggest early success in boutique overdrives, with the FD2 a common sight on professional guitarists' pedalboards in the late 1990s.{{cite web |last1=Dodge |first1=Phillip |title=5 Crucial Fender Overdrives |url=https://reverb.com/news/5-crucial-fender-overdrives |website=reverb.com |publisher=Reverb |access-date=11 December 2024}} Described as picking up where the Ibanez Tube Screamer and Boss SD-1 left off, the FD2 features expanded tonal controls in a larger housing compared to other popular overdrives, with a separate boost footswitch and multiple clipping options to alter the pedal's midrange character and compression. Guitar World dubbed the Full-Drive 2 a "Tube Screamer killer," praising it for emphasizing desirable midrange frequencies while offering a larger pallet of overdrive textures.{{cite web |last1=Gill |first1=Chris |title=Review: Fulltone Deja Vibe CS-MDV MKII and Full-Drive 2 V2 Pedals |url=https://www.guitarworld.com/gear/review-fulltone-deja-vibe-cs-mdv-mkii-and-full-drive-2-v2-pedals |website=guitarworld.com |publisher=Guitar World |access-date=11 December 2024}} The Full-Drive 2 has gone through multiple iterations, including a popular MOSFET version. Fulltone rebooted the pedal in 2018 with the Full-Drive 2 V2, which swaps the boost for a second overdrive channel and adds further clipping options.{{cite web |title=Ol' reliable Fulltone Full-Drive 2 gets rebooted |url=https://guitar.com/news/ol-reliable-fulltone-full-drive-2-gets-rebooted/ |website=guitar.com |publisher=Guitar Magazine |access-date=11 December 2024}}

File:Fulltone OCD v.1.jpg

In 2004, Fulltone released the Obsessive Compulsive Drive (OCD), a hard-clipping, op amp-based overdrive that took design cues from both the Tube Screamer-based Voodoo Labs Overdrive and the MXR Distortion+, with an "open" sound and enough headroom to mimmick a driven tube amp.{{cite web |last1=Sharma |first1=Amit |title=Warm Audio ODD Box V1 Hard-Clipping Overdrive Pedal review |url=https://www.musicradar.com/reviews/warm-audio-odd-box-v1-hard-clipping-overdrive-pedal-review |website=musicradar.com |publisher=Music Radar |access-date=30 April 2024}} Dubbed by Music Radar a "game-changing" design, the OCD further established Fulltone's prominence in the boutique market while gaining fans like Billy Gibbons, Paul Gilbert, Eric Johnson, Peter Frampton, and Don Felder.{{cite web |last1=Lynham |first1=Alex |title=The FX files: Fulltone OCD |url=https://www.musicradar.com/how-to/the-fx-files-fulltone-ocd#:~:text=Although%20this%20has%20never%20been,from%20the%20Ibanez%20Tube%20Screamer. |website=musicradar.com |publisher=Music Radar |access-date=28 April 2024}}

The OCD has gone through multiple iterations, with changes from versions 1.1 to 1.7 being generally subtle alterations of the pedal's EQ response. Version 2 brought more noticeable changes, with a new output buffer and JFET transistor input stage, and the option to use a new type of switching, enhanced bypass, instead of true bypass. After the first iteration, the drive pot's value was also increased for a more "dramatic" distortion, while an asymmetric germanium diode was later added to shift the character of the clipping. All versions of the OCD feature an HP/LP toggle switch, which stands for "high-peak/low-peak" but is often incorrectly thought to mean "high-pass/low-pass." HP mode adds distortion and presence, as well as a more pointed midrange, while LP mode maintains the amp's character.{{cite web |last1=Riario |first1=Paul |title=Review: Fulltone OCD V2 Overdrive Pedal |url=https://www.guitarworld.com/gear/review-fulltone-ocd-v2-overdrive-pedal |website=guitarworld.com |publisher=Guitar World |access-date=29 April 2024}}

Alfonso Hermida was an aerospace engineer with NASA in 1998—with a side job repairing effects pedals—when he first heard Robben Ford's rendition of "Golden Slumbers."{{cite web |last1=Ross |first1=Michael |title=Builder Profile: Hermida Audio Technology |url=https://www.premierguitar.com/builder-profile-hermida-audio-technology |website=premierguitar.com |publisher=Premier Guitar |access-date=12 December 2024}} Inspired to capture the tone he heard, Hermida spent years working on pedal designs, only later finding out about Ford and his connection to Dumble Amplifiers. In 2003, Hermida sent Ford his first finalized design, the Mosferatu, but it had more gain than Ford required. The amount featured in "Golden Slumbers," which the Mosferatu replicated, was atypical for Ford. Hermida returned to an earlier attempt at capturing Ford's tone, a design with less gain and a greater focus on dynamics—the Zendrive—and sent it to him. The pedal initially had three knobs, with Hermida later adding a fourth, "Voice," which altered the gain and bass response in tandem.

In 2004, Hermida officially released the Zendrive to acclaim. Premier Guitar praised the pedal for achieving the "smoother-than-smooth, violin-like lead tones" characteristic of Ford's amp of choice, the Dumble Overdrive Special, a famously expensive and exclusive amplifier.{{cite web |last1=Moore |first1=Adam |title=Hermida Audio Zendrive, Zendrive 2 and Mosferatu Review |url=https://www.premierguitar.com/gear/hermida-audio-zendrive-zendrive-2-and-mosferatu-review |website=premierguitar.com |publisher=Premier Guitar |access-date=12 December 2024}} The Zendrive would reach similar status, with the pedal being made in limited quantities and used prices reaching over a thousand dollars.{{cite web |last1=Oleszko |first1=Ed |title=Warm Audio Warmdrive review – bringing the Zendrive vibe to the masses |url=https://guitar.com/reviews/effects-pedal/warm-audio-warmdrive-review-bringing-the-zendrive-vibe-to-the-masses/ |website=guitar.com |publisher=Guitar Magazine |access-date=10 May 2024}} Ford himself is known to use a Zendrive with a clean Fender Twin. Struggling to keep up with demand, Hermida partnered with the company Lovepedal in 2013 to take over Zendrive manufacturing. Despite this, the Zendrive remains rare on the pedal market.

{{Main article|Ibanez Tube Screamer}}

By the late 1970s, Ibanez—mostly known for producing Fender, Gibson, and Rickenbacker copies—wished to start producing overdrive pedals to compete with the Boss OD-1.{{cite web |last1=Tucker |first1=Lindsay |title=Green Giant: History of the Tube Screamer |url=https://www.premierguitar.com/gear/tube-screamer-history |website=premierguitar.com |publisher=Premier Guitar |access-date=12 December 2024}} The task was given to manufacturer Nisshin (which sold products under the brand name Maxon) and designer Susumu Tamura. The design of the early TS-808 Tube Screamer was nearly identical to the OD-1, but relied on symmetrical clipping to avoid Boss' patent on solid-state asymmetrical clipping, while adding a tone control. Multiple iterations of the Tube Screamer followed, most notably the TS9, which replaced the TS-808 in 1982. Tube Screamers are characterized by a smooth distortion, with a strong increase in midrange frequencies and a cut in bass. This more focused tone became popular with guitarists across multiple genres and has been used by many to create their signature sound.{{cite book| last=Hunter |first=Dave |title=Guitar Effects Pedals: The Practical Handbook| year=2004 |publisher=Hal Leonard |isbn=978-0-87930-806-3| pages=68–71| url=https://books.google.com/books?id=7DjYrk7Vap4C&pg=PA68}}{{cite web |url=https://www.guitarverdict.com/effect/ibanez-ts9-tube-screamer-review/ |title=Ibanez TS9 Tube Screamer Review |date=6 June 2017 | website=Guitar Verdict |access-date=27 January 2021}} According to Premier Guitar, given the Tube Screamer's enduring popularity and influence, "no single pedal has had a greater impact on musical expression or played as important a role in the development of effects modification."

{{Main article|Klon Centaur}}

The Klon Centaur, made by American engineer Bill Finnegan, was released in 1994 with the aim of recreating the harmonically rich distortion of an amplifier at a high volume.{{Cite web |date=2014-01-21 |title=Builder Profile: Klon's Bill Finnegan |url=https://www.premierguitar.com/gear/bill-finnegan-klon |access-date=2022-12-13 |website=Premier Guitar |language=en}} Finnegan wanted a "big, open" sound, with a "hint of tube clipping," that would not sound like a pedal was being used. He was quickly overwhelmed with orders, each taking 12–14 weeks, as Finnegan handmade the pedals himself. Deciding the profit margin was not sustainable, Finnegan discontinued the original Centaur in 2008, having produced 8,000 units. He later contracted out the manufacturing of a revised design, the Klon KTR. By 2019, used Centaurs sold for between $1,900 and US$2,500.{{Cite web |date=2019-03-04 |title=The top 20 effects of all time |url=https://guitar.com/guides/buyers-guide/the-top-20-effects-of-all-time/ |access-date=2021-08-28 |website=Guitar.com |language=en-GB}} According to Guitar.com, which named the Centaur one of the industry's greatest effect pedals, "The Klon Centaur is either the greatest, most useful overdrive ever made, or the worst example of guitarists losing all sense of perspective about how much good tone should cost."

The Klon Centaur has been used by guitarists including Jeff Beck, John Mayer, Joe Perry (of Aerosmith), Nels Cline (of Wilco), Matt Schofield, and Ed O'Brien (of Radiohead).{{Cite web |last=Owen |first=Matt |date=2022-05-26 |title=Radiohead's Ed O'Brien is selling his Klon Centaur and other effects for charity |url=https://www.guitarworld.com/news/radiohead-ed-obrien-klon-auction |access-date=2022-12-13 |website=Guitar World |language=en}}

Launched in 1991 alongside the Drivemaster and Shredmaster, the Bluesbreaker overdrive was Marshall's attempt at recreating the tone of Marshall's own 1962 "Bluesbreaker" combo, nicknamed for its use by Eric Clapton when he played with John Mayall & The Bluesbreakers. While exceeding at adding subtle grit to a clean amp, the pedal failed to capture the tone of its namesake amp and was not a success during its limited initial production run. This changed years later when John Mayer started using a Bluesbreaker on his pedalboard, reigniting industry interest in it. Many pedal-makers developed modified versions of the original circuit, most notably Analog.Man's King of Tone. In 2023, Marshall reissued the Bluesbreaker, Drivermaster, and Shredmaster, as well as the earlier Guv'nor, as part of their Vintage Reissue series.{{cite web |last1=Purvis |first1=Richard |title=Marshall BluesBreaker review: can this much-copied drive pedal pick up right where it left off? |url=https://guitar.com/reviews/effects-pedal/marshall-bluesbreaker-review/ |website=guitar.com |publisher=Guitar Magazine |access-date=10 May 2024}}

The Guv'nor, released in 1988, was Marshall's first overdrive pedal. Guitar.com credited the Guv'nor as the first "Marshall-in-a-box" (MIAB) pedal, a type of overdrive pedal that specifically seeks to replicate the sound of a cranked Marshall amp, typically a Plexi or JCM800.{{cite web |last1=Purvis |first1=Richard |title=Marshall The Guv'nor review: the great amp maker's first ever overdrive pedal gets a faithful reissue |url=https://guitar.com/reviews/effects-pedal/marshall-the-guvnor-review/ |website=guitar.com |publisher=Guitar Magazine |access-date=1 December 2024}} The Guv'nor features a three-band EQ—typical for amplifiers but not overdrive or distortion pedals—which gave it greater tonal versatility. The pedal also features a rarity for an overdrive pedal: an effects loop, which allows a second pedal to be connected and activated at the same time—e.g., using the Guv'nor paired with a delay effect for solos.{{cite web |last1=Laing |first1=Rob |title=Which is the ultimate Marshall reissue overdrive and distortion pedal to buy? |url=https://www.musicradar.com/news/marshall-reissue-pedals-demo |website=musicradar.com |publisher=Music Radar |access-date=6 January 2025}} Notable players include Gary Moore, with the pedal visible in artwork for his album Still Got the Blues.{{cite web |last1=Brakes |first1=Rod |title="We Copied Them Exactly": Marshall's Steve Smith Introduces the New Guv'nor, Bluesbreaker, Drivemaster and Shredmaster Reissues |url=https://www.guitarplayer.com/news/we-copied-them-exactly-marshalls-steve-smith-introduces-the-new-guvnor-bluesbreaker-drivemaster-and-shredmaster-reissues |website=guitarplayer.com |publisher=Guitar Player |access-date=1 December 2024}}

The Guv'nor was discontinued in 1991 to make way for the launch of the Bluesbreaker, Shredmaster, and Drivemaster, the latter of which featured a revised Guv'nor circuit in new housing and without the effects loop. The Drivemaster in turn gained fans like Jeff Buckley and Dan Hawkins. Long after leaving the market, the Guv'nor circuit became popular with boutique pedal makers, with the circuit forming the basis of a wave of successful MIABs like the JHS Angry Charlie. Marshall relaunched the Guv'nor in 2023 as part of its Vintage Reissue series, which sought to take advantage of the four short-lived pedals having become collector's items.

The M133 Micro Amp was released by MXR in 1978 and since then it has become perhaps the most commonly-used "boost" pedal on the market, intended to add volume or distortion (depending on where it is placed in the signal chain) without coloring the underlying tone.{{cite web |title=The best guitar pedals to buy in 2023: 10 best boost pedals |url=https://guitar.com/guides/buyers-guide/best-clean-treble-boost-pedals/ |website=guitar.com |publisher=Guitar Magazine |access-date=6 January 2025}} The Micro Amp is simple, an op-amp design offering 26dB of signal boost with a single control for volume in a small, milk-white case with black text. Premier Guitar described it as "reliable, solid, predictable, and dirt-cheap," and dubbed it the "Toyota Corolla" of the pedal industry.{{cite web |last1=Saufley |first1=Charles |title=MXR Custom Shop Micro Amp+ Review |url=https://www.premierguitar.com/gear/mxr-custom-shop-micro-amp-review |website=premierguitar.com |publisher=Premier Guitar |access-date=6 January 2025}} While intended to act as a "transparent" boost, fans and critics have both observed that the Micro Amp slightly brightens the affected tone. Jack White is a prominent fan of the pedal, using them since The White Stripes, as is John Frusciante of The Red Hot Chili Peppers. In 2014, MXR released a "+" version of the Micro Amp, adding treble and bass controls to the original design.

The ODR-1 was created for the German brand Nobels by Kai Tachibana, who was dissatisfied with the strong increase in middle frequencies and decrease in bass common in other overdrive pedals. Tachibana had initially trained as a radio and television technician, but gained experience repairing amplifiers and effects pedals while working at an electronics repair shop.{{cite web |last1=Tachibana |first1=Kai |title=About me |url=https://www.nordland-electronics.de/en/about.html |website=nordland-electronics.de |publisher=Nordland Electroncis |access-date=3 January 2025}} Sometimes referred to as "the other green overdrive," the ODR-1 and its fuller sound became a favorite pedal for Nashville session players like Tom Bukovac and Tim Pierce.{{cite web |last1=Laing |first1=Rob |title=Is the Nobels ODR-1 the real holy grail overdrive pedal? |url=https://www.musicradar.com/news/is-the-nobels-odr-1-the-real-holy-grail-overdrive-pedal |website=musicradar.com |publisher=Music Radar |access-date=13 May 2024}} Besides its unique, more balanced EQ curve, the ODR-1 eschews the conventional tone knob, which cuts or boosts treble frequencies, for a "Spectrum" control that simultaneously boosts/cuts both highs and lower-mids as the knob is turned.{{cite web |last1=Curwen |first1=Trevor |title=Nobels ODR-1 BC & ODR-mini review |url=https://www.guitarworld.com/reviews/nobels-odr-1-bc-and-odr-mini-review |website=guitarworld.com |publisher=Guitar World |access-date=10 May 2024}} Later editions of the pedal have featured the ability to cut bass frequencies, as the low-end is sometimes considered too prominent for humbucker players. Tachibana left Nobels in 2019 to found Nordland, through which he releases ODR-1-style pedals.

Cochrane first produced the Tim overdrive, one of the first boutique overdrive pedals, and it became popular for its open, uncompressed tone with expanded EQ options. However, as the pedal was quite large, Cochrane released a smaller, four-knob option, the Timmy, which quickly surpassed the Tim in popularity. Guitar World places the Timmy in the Tube Screamer "family tree," while noting it does not have the Tube Screamer's characteristic mid-hump and is less compressed at lower gain levels. In the boutique market, the Timmy's transparent character and Volume/Gain/Bass/Treble control layout has been widely copied. Despite the pedal's success, Cochrane has continued to build the pedals himself and sells them at a reasonable price-point; Cochrane additionally assists the DIY community in creating Timmy-style pedals.{{cite web |last1=Lynham |first1=Alex |title=Classic gear: Paul Cochrane Timmy |url=https://www.guitarworld.com/features/classic-gear-paul-cochrane-timmy |website=guitarworld.com |publisher=Guitar World}} In 2020, Cochrane partnered with MXR to release a smaller format, mass-produced version of the Timmy.

• Boss' notable pedals
• Treble booster

{{reflist}}

{{DEFAULTSORT:Distortion pedals}}

Category:Music-related lists

Category:Effects units