We've all experienced it—go to a show and someone is out of tune. Or, go to a rehearsal and someone can't quite play in tune with everybody else, and what was going to be creative fun becomes kind of a slog with lots of wincing going on. The solution may be simple and obvious to most of us, but, when you go online or get to the store, the selection of available tuners can be a little overwhelming. In this article, we're going to talk about why you need a tuner, how they work, look at some of the available features and help you decide which tuner is right for you. Then, we'll take a look specifically at the best tuners that you can slap on your pedalboard to point you at the solution that will be the most harmonious for your needs.

Table of Contents

Why Is a Pedal Tuner a Vital Part of a Guitar Rig?
What is a Guitar Pedal Tuner and Why Should I Use One?
Pedal Tuner vs. Clip-on Headstock Tuner vs. Rackmount Tuner vs. Microphone-Based Tuner
   Comparing Types of Tuners
   Which Type of Tuner Is Best for Me?
Key Differences Between Chromatic, Polyphonic and Strobe Tuning Modes
   Tuning Style Comparison
What Is the Difference Between True Bypass and Buffered Bypass?
Guitar Pedal Tuner Buying Guide
   BOSS TU-3 Chromatic Pedal Tuner
   D'Addario CT-20 Chromatic Pedal Tuner
   KORG Pitchblack X Pedal Tuner
   Peterson StroboStomp HD Pedal Tuner
   Pigtronix 2NR Chromatic Pedal Tuner
   Walrus Audio Canvas Pedal Tuner
   TC Electronic PolyTune 3 Pedal Tuner
Getting It All in Tune

Why Is a Pedal Tuner a Vital Part of a Guitar Rig?

Naturally, the primary reason to have a tuner in your rig is to make it easier to play, and stay, in tune. Not that every musician shouldn't work at training their ear to be able to tune their instrument to a simple reference tone—a skill that's an important part of mastering your instrument—but having a tuner certainly makes it quick and easy when you're in the studio or on stage and need to do a quick touchup with maximum accuracy. But there are other reasons why it's a good idea.

Many modern tuners have preset modes for what are called "sweetened" tunings, frequently available as alternate tuning modes. These are slight tweaks to the tuning frequencies for individual strings that step away from what's called "equal temperament" tuning and can make an instrument play more in tune with itself, or to create a specific effect.

Another reason to have a tuner is the ability of pretty much all modern tuners to change the basic reference frequency (generally A=440Hz) or tuning standard. Let's say that you're playing somewhere where there's an acoustic piano that, for some unknown reason, is tuned to A=436Hz. The ability to quickly change the tuning on your tuner means that you will be able to play in tune with the piano all night—much easier than asking the audience if anybody there is a piano tuner.

So, quick touchups, adjusting to the more fixed tuning of other instruments, and not driving your audience out into the freezing night because that's preferable to sour harmonies—all reasons why you need a tuner in your rig.

What Is a Guitar Pedal Tuner and Why Should I Use One?

The pedal-style tuner, whether mounted on a pedalboard or free-floating on the stage, makes for one of the most common and most versatile tuner setups. In the same form factor as standard or mini-size effects pedals, they are always available without having to take your hands off the guitar, and usually self-muting for silent tuning. They are the simplest, easiest way to make sure you're always in tune. Whichever size you choose, they're easy to use, easy to power from battery or power supply (for which, see our article on choosing a power supply) and super easy to read. Many are switchable between true and buffered bypass modes, about which more in a bit. With one of these in your rig, there's never a reason to hit a sour note.

Pedal Tuner vs. Clip-on Headstock Tuner vs. Rackmount Tuner vs. Microphone-Based Tuner

As you're probably aware, there are a number of types of electronic tuners available today. Of course, if you're seriously old school, you'll make do with a tuning fork or one of those little round pitch pipes that grade school music teachers used to whip out when it was time for chorus practice, but this isn't that kind of party.

Currently available tuners can be broken down into five basic types:

• Pedal tuners
• Clip-on headstock tuners
• Rackmount tuners
• Microphone-based tuners
• Mobile app tuners (which are mostly a subset of the microphone-based tuners, with some exceptions)

Two of these, pedal and rackmount tuners, are specifically designed for pitch detection from instruments with some sort of pickup. The clip-on headstock tuner is designed to detect pitch directly from the physical vibration of the neck of your instrument. Microphone tuners and mobile app tuners rely on a microphone built into the device (as you might guess from the name). Some mobile apps can also use the input from an external audio interface, so are in a kind of in-between world.

So why are we focusing on pedal tuners here? Well, unless you only ever play purely acoustically, we think the pedal tuner is the most versatile and universally usable for most players. They just work, regardless of background noise or placement. We've tried using microphone-based tuners in a noisy room, and that can be an exercise in frustration. We've used clip-on tuners that don't grip the headstock well enough for the vibrations of the neck to be cleanly transmitted to the internal sensors of the tuner, or where the body/neck combination has resonant points that emphasize one of the natural harmonic series, usually the second harmonic (the fifth) strongly enough that it overpowers the fundamental note. And a rackmount tuner, although great for guitar techs who work on a lot of guitars, requires that you lug around a rack. For simplicity's sake, here's a quick chart of the strong and weak points of the various tuner types.

Comparing Types of Tuners

Tuner Type	Applications	Pros	Cons
Pedal Tuner	Live performance, studio sessions, making intonation adjustments	Difficult to misplace, always powered if it's on your pedalboard, clean look, easy to read, silent tuning	Won't tune purely acoustic instruments without a separate microphone
Clip-on Tuner	Live performance, studio sessions	Small, easily portable, silent tuning, can leave it on while playing for quick checks, affordable	Batteries go dead at inconvenient times, can be confused by overtones, clunky look, easy to misplace, can be slightly less accurate
Rackmount Tuner	Live performance, studio sessions, instrument repair, making intonation adjustments	Accurate, can be left on while playing	More expensive, not as portable
Microphone Tuner	Studio sessions, practice sessions, acoustic instruments	Affordable, compact, longer battery life	Very susceptible to background noise, not sufficiently accurate for more technical use
Mobile App Tuner	Practice sessions, studio sessions, acoustic instruments	Affordable, always with you	Very susceptible to background noise, varying accuracy from app to app

Which Type of Tuner is Best for Me?

So, taking all of this under consideration, which tuner is the right one for you? First consider where and how you're most likely to be using a tuner. Then, use the table above as a guide to your needs. If, for instance, your primary usage is likely to be in live performance or rehearsal situations where there's a lot of background noise, the microphone-based and mobile app-based tuners are probably not your best bet. If you're in the studio or live, and want to do quick, silent touchups to your tuning, that would point toward either a pedal or a clip-on headstock tuner. The pedal tuner tends to be a little more accurate, and, since they generally mute the instrument when you step on the button, it's one less thing you have to remember to go silent. If you're a tech, or bring a lot of instruments to a gig, either the pedal or rackmount tuners would be the right way to go. But, it's all down to you and what your priorities are. In this article, we're focusing on pedal tuners because we've found them to be the most versatile solution for most players.

Key Differences Between Chromatic, Polyphonic and Strobe Tuning Modes

Generally, pedal tuners can be divided into three basic types: chromatic, polyphonic and strobe. So, what do these terms really mean, when it comes to tuners?

A chromatic tuner can tune any note, so if you like to tune the entire guitar down a half-step (or more), or use a lot of open tunings, like DADGAD, as long as you know the pitch names you want, it's a piece of cake to get tuned up (or down, as the case may be).

Polyphonic tuners, as you might guess from the name, have pitch detection algorithms that can display the tuning of all six strings at the same time (sorry, 7- and 8-string players). This is great, especially for tremolo-equipped guitars, since it makes it really easy to see how the tension changes involved in tuning one string can affect all the others. These tuners will also have a single-string mode and often a sort of faux strobe display mode. This leads us to the last category of tuner.

Strobe tuners are the oldest electronic (actually electro-mechanical at first) tuners, first developed in 1936, by the C.G. Conn company. The original versions used spinning disks, a variable speed motor and one (or more) strobing lights to compare the input to a set reference frequency. While this may seem like a rather complex scheme, it offers incredible accuracy (on the order of .01 cents, or 1/1000 of a semi-tone) and extremely fast response. Conn's tuner division was sold to Peterson in 1985. Peterson had developed the first solid-state version of a stroboscopic tuner in the mid-1970s, so they were an appropriate steward of the tradition. The use of a reference frequency rather than computed pitch-detection keeps strobe tuners at the top in speed and accuracy.

Tuning Style Comparison

Tuning Type	Applications	Pros	Cons
Chromatic	General-purpose tuning	Great for non-standard tunings, works with any instrument with pickups or electronic output	Less likely to have sweetened tunings
Polyphonic	General-purpose tuning	Excellent for quick tuning touchups as you can easily see the relationship between strings	Guitar-centric, so if you need to tune other instruments, you may need a workaround
Strobe	Any tuning task that requires extreme accuracy	Absolutely the most accurate tuning standard, great for setting intonation and other precision tasks	Can take a little extra time to tune

What is the Difference Between True Bypass and Buffered Bypass?

A number of these pedal tuners can switch between buffered and true-bypass modes. While this has been discussed extensively (and exhaustively) elsewhere, with some rather strong opinions being expressed on occasion about the advantages and disadvantages of each mode, we're going to just touch on it here.

Buffered bypass means that whether a pedal is on or off, the instrument signal is still passing through the circuitry of the pedal, and is running through whatever chips (analog op-amps, digital converters, etc.) are in the pedal's circuitry, with the effect simply turned off.

True bypass means that there is an alternate circuit path, generally switched to by an internal relay, that is a "straight-wire" connection for the pedal input to the pedal output, so the pedal circuit board is taken entirely out of the signal path when the pedal is bypassed.

The basic argument for a true-bypass system is that your guitar's tone can be affected by passing through a pedal's circuitry in a buffered situation, changing the overall impedance that the amp sees if a guitar were plugged directly into it. A true-bypass pedal is closer to having a direct guitar>cable>amp signal path, and your amp sees the actual output impedance of your pickups. The downside is that, unless every one of your pedals is true bypass, any potential upside goes away.

The essential argument in favor of a buffered pedal is that it compensates for the normal signal, frequency losses and noise that can come from running an unbalanced audio signal. This generally means that no pedal is going to cause a big gain or loss in volume from its internal circuitry when it's switching on or off (unless, of course, you've set it to do that). The downside is that you might lose a little touch sensitivity at the amp and, if you do have a pedal (like some vintage fuzz pedals) that is very responsive to the changes in the guitar's output impedance, you'll lose that if there's a buffered pedal between your guitar and that pedal.

We're not making a call either way here, as the choice of buffered or true bypass is completely in your hands and ears. You do you, and we'll help however we can.

Guitar Pedal Tuner Buying Guide

Now that we've laid some groundwork and defined some terms, let's get down to the nitty-gritty, with a list of seven of the best pedal tuners that we think are all worthy of a spot on your pedalboard.

BOSS TU-3 Chromatic Pedal Tuner

The BOSS TU-3 chromatic pedal tuner is one of the most popular tuners on the market today. A standard-size pedal with switchable chromatic and guitar/bass modes (Bonus: It supports 7-string guitars and 6-string basses in that mode, and has a drop pitch mode), it's easy to set up for your exact use case. A bright 21-segment LED display with note name and Accu-Pitch indicator give you positive feedback when you're in tune. As an added bonus, the TU-3 can act as power distribution for up to seven other BOSS pedals with the optional PCS-20A accessory cable (sold separately). With 86 reviews, at an average rating of 4.66, the BOSS TU-3 is the top reviewed tuner on this list.

Bottom Line: An excellent all-around tuner, especially if your pedalboard features other BOSS pedals that can take advantage of the available power distribution.

Pictured: BOSS TU-3 Chromatic Pedal Tuner

D'Addario CT-20 Chromatic Pedal Tuner

The true-bypass D'Addario CT-20 chromatic tuner pedal is a great choice for crowded pedalboards. The bright, colorful LED display is easy to read with a quick glance, and the powerful 32-bit processor makes for lightning-fast pitch detection. The mini-pedal size makes it easy to fit almost anywhere. A side button enables you to scroll through and select a wide range of tuning standards, from A415 to A475.

Bottom Line: If you want speed, aren't necessarily a fan of the strobe tuner type display and you're running out of pedalboard space, this will fit.

Pictured: D'Addario CT-20 Chromatic Pedal Tuner

KORG Pitchblack X Pedal Tuner

The KORG Pitchblack X offers strobe tuner accuracy in a standard-sized pedal. With the ability to switch between KORG's Ultra Buffer technology or true bypass, it's an excellent choice for either school of signal chain devotee. Its multiple display modes (regular, strobe, half strobe and mirror) make it suitable for multiple applications and, like many of the tuners we discuss here, it has a power out jack that can distribute power to another pedal, when the Pitchblack X is running off an AC power supply, rather than its internal 9V battery.

Bottom Line: The Pitchblack X's combination of stealthy black look and versatility of display choices, combined with its accuracy and bypass choices makes this an excellent pick for the heavier music pedalboard.

Pictured: KORG Pitchblack X Pedal Tuner

Peterson StroboStomp HD Pedal Tuner

The Peterson StroboStomp HD tuner is a great plug 'n' play strobe tuner. There are a ton of hidden features in it, as well, which makes it one of the most versatile tuners here. The extensive manual is a must-read to access them, but it's definitely time well spent. With over 130 different tuning presets built in, some of which Peterson calls "Guided Tuning" for specific instruments and some "sweetened" tunings, as we discussed earlier, you can dial in extraordinary precision. It's even possible to create your own customized tunings with the free Peterson Connect app and the pedal's micro-USB port. The StroboStomp HD is switchable between true bypass, buffered bypass and a buffered bypass/monitor mode, which keeps the tuner display active while you're playing for those quick touchups. It does have a power passthrough when connected to an external power supply. There's also the StroboStomp Mini, for crowded pedalboards, which gives up that power passthrough, but retains almost the entire feature set of the HD version.

Bottom Line: If you're a gear geek who loves to tweak, this tuner will have you in tech heaven. Also if you do home setups and intonation, Peterson has been the guitar tech's standard on the road for decades.

Pictured: Peterson StroboStomp HD Pedal Tuner

Pigtronix 2NR Chromatic Pedal Tuner

If you're looking for a tuner that is just a tuner, the Pigtronix 2NR Chromatic tuner is quick, accurate and provides a larger, clean, colorful display that makes for a fast tuning experience. This pedal is true-bypass only, mutes while tuning, and is locked to the A440 tuning standard. With a minimum of bells and whistles, this just works, without distractions and hassle.

Bottom Line: If simple is your style, this is the one. Short, sweet and in tune.

Pictured: Pigtronix 2NR Chromatic Pedal Tuner

Walrus Audio Canvas Pedal Tuner

Walrus Audio spent a fair amount of time listening to their users when designing the Walrus Audio Canvas tuner pedal. This one has some unique features from the fun, but relatively trivial, ability to upload a personalized photo to your standby screen, to the ability to rotate the display, enabling the pedal to be used in vertical or horizontal orientation on your pedalboard. Switchable from "needle" mode to strobe mode, with tuning customizability, and with an exceptionally wide range of available tuning standards (from A390 to A490), Walrus really hit it out of the park with their very first tuner pedal. A quick caveat is that all the computing power for this needs a higher current draw than most tuners, so you will want to run this on a high current (300ma or greater) power supply.

Bottom Line: The rotatable display for versatile placement options is the killer feature here, with the side benefit of being able to upload a photo of your pooch (or sweetie) as wallpaper a very sweet addition.

Pictured: Walrus Audio Canvas Pedal Tuner

TC Electronic PolyTune 3 Pedal Tuner

When TC Electronic debuted the PolyTune 3 tuner pedal it was a true breakthrough. The ability to just strum your open strings and instantly see how the guitar was in tune with itself made quick, mid-song tuning touchups incredibly quick and easy. The latest generation of the Polytune pedal features TC's Bonafide Buffer technology for a clean, clear signal, no matter how long your signal path, but retains the ability to switch to a true-bypass mode. The polyphonic mode is easily switched to a needle or strobe mode for when you need to concentrate on getting that one troublesome string locked in or touch up your intonation. The compact size is a plus for easy pedalboard placement.

Bottom Line: If you find yourself always needing (or wanting) to do quick mid-song touchups to your tuning, the polyphonic feature of the Polytune is the shining beacon for this tuner.

Pictured: TC Electronic PolyTune 3 Pedal Tuner

Getting It All in Tune

Now you should be armed with the info you need to choose the best tuner for your needs. Before we go, though, we'd like to reiterate something we touched on earlier. A tuner is a tool, but it shouldn't be your only tool. Learning how to tune your guitar or bass by ear to an external reference tone (or to a tone in your head) is an important part of mastering your instrument. It feeds into refining your ear so you can recognize intervals more readily, which is an excellent musical skill to have, especially when, like many of us, you need to figure out chords and melodies on the fly. Tuners are seriously convenient, but they should supplement your ability to hear and listen, not replace it.

As always, if you have any questions about the pedals we've talked about here, drop into your local Guitar Center store, or dial up our call center and talk to one of our knowledgeable Gear Advisers to get even more of the info you need to make your final decision. And keep playing—the world always needs all the music it can get.