There’s a particular kind of chorus that you recognise the instant you hear it — crystalline, wide, and just a little bit clinical in the best possible way. It sits under clean chords like a second voice, adds dimension to single-note lines without blurring them, and turns two amplifiers into something that feels like the room itself is vibrating. That sound has a name, even if most people don’t know it: the Boss CH-1 Super Chorus. Since 1989, this blue compact has been the default chorus pedal for players who want stereo capability, simple controls, and Boss reliability without paying boutique prices. It is not the most revered chorus in the lineup — the CE-2 carries that crown — but the CH-1 is arguably the most practical, and in sheer numbers, one of the best-selling chorus pedals ever made.
From the Jazz Chorus to the Pedalboard: Where the CH-1 Came From
To understand the CH-1, you need to understand where Boss chorus began. The CE-1 (1976) was not only Boss’s first pedal — it was the world’s first commercially produced chorus pedal, a rack-sized unit derived from the Roland Jazz Chorus amplifier’s onboard Dimensional Space Chorus circuit. The Jazz Chorus, introduced with the JC-120 in 1975, used a stereo chorus circuit where the wet signal went to one speaker and the dry to another, creating a spatial illusion that sounded like more than one guitar playing slightly out of phase with itself. The CE-1 bottled that circuit into a standalone pedal.
The CE-2 (1979) simplified the concept further — a mono compact with analog BBD circuitry and just two knobs (Rate and Depth), it became the template for warm chorus pedals for the next two decades. But it had no stereo output, and as the 1980s progressed and stereo rigs became standard for working players, that limitation mattered more.
Boss released the CH-1 Super Chorus in May 1989 to fill that gap. Where the CE-2 was warm and mono, the CH-1 was stereo and versatile. The addition of a fourth knob — EQ — gave players control over the tonal character of the effect itself, something the CE-2 never offered. And the addition of OUTPUT A and OUTPUT B jacks brought genuine stereo capability to a compact pedal, directly inspired by the JC-120’s two-speaker design. Boss’s own description of the CH-1’s stereo output is explicit: it “authentically recreates the wide, immersive experience of the JC-120.”
Two Eras, One Pedal: Analog vs. Digital
One of the most important facts about the CH-1 is one that many buyers don’t know: there are two fundamentally different versions of this pedal, and they sound different.
From 1989 to approximately 2001, the CH-1 used an analog circuit built around the MN3007 bucket-brigade delay (BBD) chip — the same family of chips used in the CE-2 and countless other vintage chorus and delay pedals. This first-generation CH-1 carries a blue or dark blue label and commands collector interest precisely because of this analog provenance. The BBD circuit produced a chorus with warmth similar to the CE-2, though with a brighter and more open character due to the added EQ control and stereo architecture. These early units are sought out specifically because the analog circuit retains the subtle complexity and slight imperfections that digital precision eliminates.
In October 2001, Boss changed the CH-1’s internal circuit to a digital chorus model using surface-mounted components. The label changed to dark gray. This is the version that has been in production ever since — the current CH-1 you buy new in 2026 is this digital unit. The digital circuit is crisper, more transparent, and more consistent than the analog version. Whether it’s better is a matter of taste: players who want modern clarity and reliability prefer it; players chasing vintage warmth typically prefer the earlier blue-label units.
For the purposes of this article, specs and sound descriptions reflect the current production digital unit unless specifically noted otherwise. If you are shopping vintage blue-label CH-1 units, expect prices in the $80–150 range depending on condition, significantly above the current production pedal’s street price.
The Controls: Four Knobs, No Wasted Space
The CH-1’s control layout is deceptively powerful for four knobs and a footswitch.
E.LEVEL sets how much chorus effect is blended with the dry signal. Unlike some chorus pedals where the effect signal partially replaces the dry signal, the CH-1’s Level control manages the mix of wet and dry, allowing anything from barely perceptible modulation to thick, lush swirling. Setting it too high can thin out the low end; the sweet spot for most applications is between 10 o’clock and 1 o’clock.
RATE controls the speed of the modulation. At its slowest (fully counterclockwise), the chorus cycle is so gradual you barely perceive it as movement — it reads as width rather than motion. At its fastest (fully clockwise), it produces a vibrato-adjacent shimmer that works for specific pitch-bend-style effects. Most playing sits between 8 o’clock and noon on this control.
DEPTH sets how wide the pitch modulation swings. At low settings the chorus is subtle and polite, almost indistinguishable from the dry signal until you bypass the pedal and notice what’s missing. At high settings the pitch modulation becomes audibly wide — the “watery” effect that defines ’80s chorus guitar.
The EQ knob is the CH-1’s most distinctive feature and the one that most separates it from the CE-2 and simpler chorus pedals. It functions as a low-pass filter applied specifically to the effected (wet) signal, not the overall output. Turned counterclockwise, the chorus takes on a darker, warmer tone with rolled-off highs — approaching the character of the CE-2’s analog warmth. Turned clockwise, the effect gains brilliance and sparkle, with a crystalline brightness in the high frequencies that suits modern clean tones and keyboards. The EQ control essentially lets you tune the tonal color of the chorus itself independently of your guitar’s tone settings, which is genuinely useful when your overall rig EQ is already set for a specific amp voice.
The Stereo Output Architecture
The CH-1 has two outputs: OUTPUT A and OUTPUT B. When used in mono with a single cable plugged into OUTPUT A, the pedal delivers a conventional wet/dry mixed mono signal. This is perfectly functional and how most players use it.
When both outputs are used with two amplifiers, the architecture changes significantly. OUTPUT A carries the wet (effected) chorus signal, and OUTPUT B carries the dry (uneffected) signal. These two signals — one with the modulated pitch and one completely dry — are sent to two separate amplifiers at physically separated positions on stage or in the room. The result is that the chorus effect doesn’t exist within the guitar signal itself; it exists in the space between the amplifiers. The wet signal moves and shimmers from one speaker, while the dry signal anchors the tone from another. When they merge in the room’s acoustic space, the effect is qualitatively wider and more enveloping than any mono chorus pedal, because it recreates the actual stereo speaker separation of the Roland JC-120.
This is not a subtle difference. Players who have only used the CH-1 in mono and then switched to a proper two-amp stereo setup with OUTPUT A and B consistently report that the stereo configuration sounds like a fundamentally different — and better — pedal. The E.LEVEL control effectively becomes a wet-signal volume in this configuration, and the interaction between the modulated and dry signals in physical space produces dimensional effects that single-amp chorus cannot match.
Famous Players
The CH-1 lacks the singular iconic endorsement that defines some Boss pedals — no “Smells Like Teen Spirit” moment where one famous recording makes the pedal’s identity permanent. Its reputation is built differently: through breadth of use, decades of continuous production, and the sheer number of pedalboards it has appeared on across four decades of recorded music.
One of the most documented professional users of the CH-1 is Rachel Goswell of Slowdive. The 1993 Slowdive rig documentation captured via guitar.com’s rig diagram archive and Equipboard shows the Boss CH-1 as part of her signal chain during the band’s original Souvlaki era. Goswell’s approach to guitar within Slowdive is textural rather than lead-driven — layers of shimmer and wash supporting the band’s signature dream-pop density — and the CH-1’s clear, stereo-capable chorus fit that application precisely. By the time of Slowdive’s 2023 North American reunion tour, her board had evolved considerably toward boutique alternatives, but the early-era CH-1 use documented by multiple sources places her among the pedal’s most notable users in the shoegaze context where chorus is not an accessory but a structural element of the sound.
Beyond documented individual users, the CH-1 has been a long-standing fixture across genres precisely because of its versatility. Its EQ control allows it to serve new wave players who want the bright, slightly artificial shimmer of ’80s pop recordings and simultaneously to serve players who want the warmer, more subtle vintage chorus character of the CE-2 era. That range without requiring multiple pedals is the CH-1’s practical argument in two sentences.
Tone Recipes and Settings
Classic Clean Shimmer — Slow and Subtle
E.LEVEL: 10 o’clock | RATE: 9 o’clock | DEPTH: 9–10 o’clock | EQ: noon
This is the CH-1’s workhorse setting. The rate is slow enough that you hear the effect as width rather than wobble, the depth is conservative enough to enhance rather than dominate, and the EQ at noon gives the clean upper-mid sparkle the pedal is known for. Works particularly well with a Telecaster or Stratocaster into a clean Fender-style amplifier — arpeggiated chord progressions, rhythm parts, ambient textures. The effect should feel like the note has a room around it, not like it’s moving.
’80s New Wave Brightness — Rate Up, EQ Up
E.LEVEL: 11 o’clock | RATE: 11 o’clock–noon | DEPTH: 1 o’clock | EQ: 2–3 o’clock
The CH-1 with EQ turned clockwise — into its brighter register — and rate raised to a perceptible pulse gives you the crystalline, slightly synthetic chorus associated with the 1980s synth-pop and new wave recordings that defined chorus as a tonal signature. Into a clean amp with no additional overdrive, this is the setting that places single-note lines and chord stabs in a specific era. The brightness of the EQ control distinguishes the CH-1 from the warmer CE-2 character in this configuration.
Vintage Warmth — EQ Counterclockwise
E.LEVEL: 10 o’clock | RATE: 9 o’clock | DEPTH: 10 o’clock | EQ: 7–8 o’clock
The CH-1 with EQ turned counterclockwise approaches the tonal character of the analog CE-2 — the high-frequency content of the effect signal rolls off, leaving a warmer, less defined shimmer that blends into the dry signal rather than sitting on top of it. This is the setting for players who want the CH-1’s stereo output capability without the modern brightness of the default configuration. On the current digital CH-1, this won’t fully replicate the warmth of a vintage blue-label unit, but it moves meaningfully in that direction.
Thick Lead Chorus — Depth Up
E.LEVEL: noon | RATE: noon | DEPTH: 2–3 o’clock | EQ: noon
Raising the Depth control adds physical width to single-note lead lines — the pitch modulation becomes audibly present, not just felt as dimension. This is the chorus setting for melodic guitar lines that need to occupy more sonic space without additional reverb or delay. Into a clean-channel amplifier with a touch of amp gain, this produces the kind of wide, thick solo chorus that defined lead guitar sound in rock recordings from 1989 through the mid-1990s.
Stereo Two-Amp Spread — Both Outputs
E.LEVEL: 11 o’clock | RATE: 9 o’clock | DEPTH: 10–11 o’clock | EQ: noon
With OUTPUT A running to one amplifier and OUTPUT B to a second amp placed at a different physical location, set conservative Rate and Depth values — less than you’d use in mono. The stereo architecture does the heavy lifting that depth and rate do in mono; aggressive modulation settings in stereo become overwhelming. The E.LEVEL control manages the wet/dry balance in this configuration: the wet signal’s volume relative to the dry signal determines how much the chorus dominates versus supports the tone. Starting at 10–11 o’clock and adjusting to the room is recommended.
How the CH-1 Fits in the Boss Chorus Family
Boss has produced more chorus pedals than any other manufacturer, and understanding where the CH-1 sits requires placing it among its siblings.
The CE-2W Waza Craft is the premium analog alternative — all-analog BBD circuitry, Made in Japan, three modes (CE-2, CE-1 Chorus, CE-1 Vibrato), stereo output, approximately $199. The CE-2W is for players who specifically want analog BBD warmth and are willing to pay for it. For the current digital CH-1 buyer, the CE-2W occupies a different tier: it costs more than twice as much and prioritises analog character over the CH-1’s versatility. If you need the CE-2W’s specific circuit, the CH-1 is not a substitute. If you need a versatile, reliable stereo chorus at accessible price, the CE-2W’s added cost may not be justified.
The CE-5 Chorus Ensemble is the CH-1’s closest comparison in the current Boss lineup. Both are stereo, both have similar controls, and both are positioned at similar price points. The main difference is in the EQ architecture: the CE-5 has independent high-cut and low-cut filter knobs that apply to the effect signal, offering more surgical tonal shaping of the chorus itself. The CH-1’s single EQ knob is simpler but also more intuitive. Players who want independent treble and bass control over the chorus character will prefer the CE-5; players who want a single tone sweep with less complexity will prefer the CH-1. The CE-5 is generally described as sounding warmer and more balanced at mid-range settings; the CH-1 is described as crisper and more immediate.
The DC-2W Dimension C occupies a completely different category — it’s a digital recreation of the Roland Dimension D rack unit, producing a chorus-adjacent spatial effect without Rate or Depth controls. Where the CH-1 and CE-5 produce conventional chorus with perceptible modulation, the DC-2W aims for a dimension effect that enhances width without obvious movement. They serve different applications and are not direct competitors.
Against the TC Electronic Corona Chorus, the CH-1 is simpler and less expensive. The Corona offers TonePrint functionality allowing loading of custom chorus voices from TC’s library, plus a more complex EQ architecture. The CH-1 wins on simplicity, reliability, and Boss build quality. For players who don’t need TonePrint and want a straightforward pedal that will last decades on a working pedalboard, the CH-1 remains a credible choice over the Corona.
The Buying Guide: Analog vs Digital, New vs Used
The current production digital CH-1 is available new for approximately $89–99 USD at major retailers. Used current-model CH-1 units typically sell for $40–65 depending on condition. This is a genuinely low price for a stereo chorus pedal with 35 years of proven reliability.
Vintage analog blue-label CH-1 units (1989–2001) command significantly higher prices on the used market: expect $80–150 or more for clean examples, with Japan-manufactured earliest units occasionally fetching more. If analog warmth is the goal, the blue-label CH-1 is a viable and affordable alternative to boutique analog chorus pedals, though the CE-2W offers superior analog engineering at a higher price.
There are no versions to avoid and no known reliability concerns with the current digital production unit. The standard Boss 5-year warranty applies to new purchases. The 55mA current draw is slightly higher than simpler Boss compact pedals (the DS-1 draws 5mA, the SD-1 draws 10mA) but manageable on any modern isolated power supply. Daisy-chaining 55mA alongside several other pedals on a shared supply may cause noise or voltage drop; an isolated output rated at least 100mA is recommended.
The INPUT jack serves as the power switch — plugging in a cable activates the internal circuit and begins drawing current. Battery life is approximately 6 hours on alkaline. For regular use, a dedicated 9V DC supply is strongly recommended.
Ownership Notes
The CH-1’s EQ knob is frequently misused by players who turn it to maximum immediately seeking brightness. The most useful range for most applications is between 10 o’clock and 2 o’clock — the extremes of the EQ knob produce character effects rather than general-purpose chorus tones. Start at noon and adjust toward your amp’s natural brightness.
In mono configurations, the CH-1’s buffered bypass means it can be placed anywhere in the signal chain without the impedance sensitivity that affects germanium fuzz pedals. If your board includes a vintage germanium fuzz that requires being first in the chain, place the CH-1 after it; otherwise, chain position is flexible.
The stereo output configuration requires planning at the pedalboard level. If you’re running stereo downstream effects (stereo reverb, stereo delay), the CH-1’s wet/dry split requires either a mixer to reunite the signals before subsequent effects, or deliberately separate wet and dry signal chains. Many players using the CH-1 in stereo run it at the end of the chain, into two clean amplifiers with no shared downstream processing.
The CH-1 stacks usefully with overdrive pedals. Placed before an overdrive, the chorus creates a wide, modulated signal that the overdrive compresses and saturates — the modulation survives the gain but becomes more subtle, producing a chorus-through-amp character. Placed after overdrive, the CH-1 applies chorus to an already-driven tone, keeping the modulation clean and external to the gain structure. Both are valid; the difference in character is meaningful and worth experimenting with.
FAQ
What is the difference between the analog and digital CH-1?
From 1989 to approximately 2001, the CH-1 used an analog BBD circuit (MN3007 chip) and carried a blue or dark blue label. From 2001 onward, the circuit changed to a digital design with SMD components and a gray label. The analog version is warmer and has the subtle character of bucket-brigade circuitry. The digital version is crisper, more transparent, and more consistent. The analog version commands higher used prices; the digital version is the current production unit available new.
What does the EQ knob actually do?
The EQ knob applies a low-pass filter specifically to the effected (wet) signal — not the overall output. Turning it counterclockwise rolls off the high-frequency content of the chorus signal, making it darker and warmer. Turning it clockwise allows more high-frequency content through, making the chorus brighter and more prominent. It doesn’t affect the dry signal directly; it shapes the tonal character of the chorus effect itself.
How do I set up the stereo output correctly?
Use a cable in OUTPUT A running to your first amplifier and a separate cable in OUTPUT B running to your second amplifier. OUTPUT A carries the wet (chorused) signal; OUTPUT B carries the dry (unaffected) signal. When both amps play simultaneously in the same room, the wet and dry signals merge in space, creating the wide dimensional chorus effect. In mono, only OUTPUT A is used, which delivers a standard wet/dry mixed signal.
CH-1 vs CE-5 — which should I buy?
If you want simple controls and don’t need independent control of high and low frequency filtering in the effect signal, the CH-1 is the more intuitive choice. If you want more surgical EQ control over the chorus character — specifically independent high-cut and low-cut filtering — the CE-5 is the better choice. The CE-5 is generally described as sounding warmer at mid-range settings; the CH-1 is crisper. Both are comparable in price. Neither is objectively better; the CE-5 offers more control, the CH-1 offers more simplicity.
Can the CH-1 produce warm, subtle chorus or is it always bright?
Yes — turning the EQ knob counterclockwise rolls off the high-frequency content of the chorus signal significantly, moving the CH-1 toward the warmer character of the analog CE-2. Combined with a conservative Rate (9 o’clock) and low Depth setting, the CH-1 produces chorus that is atmospheric and subtle rather than bright and obvious. The default “super chorus” character is brighter, but the EQ control provides genuine range.
Does the CH-1 have true bypass or buffered bypass?
The CH-1 uses Boss’s standard FET buffered bypass. The effect is bypassed when the pedal is switched off, but the input signal still passes through the buffer circuit. This is beneficial for maintaining signal integrity over long cable runs and in complex signal chains, but it means the CH-1 is not transparent in the way a mechanical true-bypass pedal is. Germanium fuzz pedals that require true-bypass or a high-impedance input before them should be placed before the CH-1 in the chain.
Can I use the CH-1 with bass guitar?
Yes. The CH-1’s EQ knob counterclockwise gives the bass signal a chorus effect that retains low-frequency warmth without excessive high-frequency shimmer. The stereo output is a genuine advantage for bass players running stereo rigs. The pedal responds to bass frequencies without the EQ thinning typical of simpler chorus circuits at full treble settings. Keep the EQ below noon for bass applications to preserve the low-end integrity of the dry signal relative to the chorus effect.
How does the CH-1 compare to the CE-2W Waza Craft?
The CE-2W is an all-analog Waza Craft pedal made in Japan with three circuit modes — CE-2, CE-1 Chorus, and CE-1 Vibrato — at approximately $199. The CH-1 is a digital pedal at approximately $89–99. For analog purists who want BBD warmth and the CE-1 circuit option, the CE-2W is a different category of pedal. For players who want a versatile, affordable stereo chorus with a wider EQ range, the CH-1 is the practical choice. They are not substitutes for each other if the CE-2W’s specific analog character is the goal.