The gear Adrian Smith, Dave Murray, and Janick Gers are using onstage
The two-in-one “sonic refractor” takes tremolo and wavefolding to radical new depths.
Pros: Huge range of usable sounds. Delicious distortion tones. Broadens your conception of what guitar can be.
Build quirks will turn some users off.
$279
Cosmodio Gravity Well
cosmod.io
Know what a wavefolder does to your guitar signal? If you don’t, that’s okay. I didn’t either until I started messing around with the all-analog Cosmodio Instruments Gravity Well. It’s a dual-effect pedal with a tremolo and wavefolder, the latter more widely used in synthesis that , at a certain threshold, shifts or inverts the direction the wave is traveling—in essence, folding it upon itself. Used together here, they make up what Cosmodio calls a sonic refractor.
Two Plus One
Gravity Well’s design and control set make it a charm to use. Two footswitches engage tremolo and wavefolder independently, and one of three toggle switches swaps the order of the effects. The two 3-way switches toggle different tone and voice options, from darker and thicker to brighter and more aggressive. (Mixing and matching with these two toggles yields great results.)
The wavefolder, which has an all-analog signal path bit a digitally controlled LFO, is controlled by knobs for both gain and volume, which provide enormous dynamic range. The LFO tremolo gets three knobs: speed, depth, and waveform. The first two are self-explanatory, but the latter offers switching between eight different tremolo waveforms. You’ll find standard sawtooth, triangle, square, and sine waves, but Cosmodio also included some wacko shapes: asymmetric swoop, ramp, sample and hold, and random. These weirder forms force truly weird relationships with the pedal, forcing your playing into increasingly unpredictable and bizarre territories.
This is all housed in a trippy, beautifully decorated Hammond 1590BB-sized enclosure, with in/out, expression pedal, and power jacks. I had concerns about the durability of the expression jack because it’s not sealed to its opening with an outer nut and washer, making it feel more susceptible to damage if a cable gets stepped on or jostled near the connection, as well as from moisture. After a look at the interior, though, the build seems sturdy as any I’ve seen.
Splatterhouse Audio
Cosmodio’s claim that the refractor is a “first-of-its-kind” modulation effect is pretty grand, but they have a point in that the wavefolder is rare-ish in the guitar domain and pairing it with tremolo creates some pretty foreign sounds. Barton McGuire, the Massachusetts-based builder behind Cosmodio, released a few videos that demonstrate, visually, how a wavefolder impacts your guitar’s signal—I highly suggest checking them out to understand some of the principles behind the effect (and to see an ’80s Muppet Babies-branded keyboard in action.)
By folding a waveform back on itself, rather than clipping it as a conventional distortion would, the wavefolder section produces colliding, reflecting overtones and harmonics. The resulting distortion is unique: It can sound lo-fi and broken in the low- to mid-gain range, or synthy and extraterrestrial when the gain is dimed. Add in the tremolo, and you’ve got a lot of sonic variables to play with.
Used independently, the tremolo effect is great, but the wavefolder is where the real fun is. With the gain at 12 o’clock, it mimics a vintage 1x10 tube amp cranked to the breaking point by a splatty germanium OD. A soft touch cleans up the signal really nicely, while maintaining the weirdness the wavefolder imparts to its signal. With forceful pick strokes at high gain, it functions like a unique fuzz-distortion hybrid with bizarre alien artifacts punching through the synthy goop.
One forum commenter suggested that the Gravity Well effect is often in charge as much the guitar itself, and that’s spot on at the pedal's extremes. Whatever you expect from your usual playing techniques tends to go out the window —generating instead crumbling, sputtering bursts of blubbering sound. Learning to respond to the pedal in these environments can redefine the guitar as an instrument, and that’s a big part of Gravity Well’s magic.
The Verdict
Gravity Well is the most fun I’ve had with a modulation pedal in a while. It strikes a brilliant balance between adventurous and useful, with a broad range of LFO modulations and a totally excellent oddball distortion. The combination of the two effects yields some of the coolest sounds I’ve heard from an electric guitar, and at $279, it’s a very reasonably priced journey to deeply inspiring corners you probably never expected your 6-string (or bass, or drums, or Muppet Babies Casio EP-10) to lead you to.
The author in the spray booth.
Does the type of finish on an electric guitar—whether nitro, poly, or oil and wax—really affect its tone?
There’s an allure to the sound and feel of a great electric guitar. Many of us believe those instruments have something special that speaks not just to the ear but to the soul, where every note, every nuance feels personal. As much as we obsess over the pickups, wood, and hardware, there’s a subtler, more controversial character at play: the role of the finish. It’s the shimmering outer skin of the guitar, which some think exists solely for protection and aesthetics, and others insist has a role influencing the voice of the instrument. Builders pontificate about how their choice of finishing material may enhance tone by allowing the guitar to “breathe,” or resonate unfettered. They throw around terms like plasticizers, solids percentages, and “thin skin” to lend support to their claims. Are these people tripping? Say what you will, but I believe there is another truth behind the smoke.
It’s the shimmering outer skin of the guitar, which some think exists solely for protection and aesthetics, and others insist has a role influencing the voice of the instrument. Builders pontificate about how their choice of finishing material may enhance tone by allowing the guitar to “breathe,” or resonate unfettered. They throw around terms like plasticizers, solids percentages, and “thin skin” to lend support to their claims. Are these people tripping? Say what you will, but I believe there is another truth behind the smoke.
Nitrocellulose lacquer, or “nitro,” has long been the finish of choice for vintage guitar buffs, and it’s easy to see why. Used by Fender, Gibson, and other legendary manufacturers from the 1950s through the 1970s, nitro has a history as storied as the instruments it’s adorned. Its appeal lies not just in its beauty but in its delicate nature. Nitro, unlike some modern finishes, can be fragile. It wears and cracks over time, creating a visual patina that tells the story of every song, every stage, every late-night jam session. The sonic argument goes like this: Nitro is thin, almost imperceptible. It wraps the wood like silk. The sound is unhindered, alive, warm, and dynamic. It’s as if the guitar has a more intimate connection between its wood and the player's touch. Of course, some call bullscheiße.
In my estimation, nitro is not just about tonal gratification. Just like any finish, it can be laid on thick or thin. Some have added flexibility agents (those plasticizers) that help resist damage. But as it ages, old-school nitro can begin to wear and “check,” as subtle lines weave across the body of the guitar. And with those changes comes a mellowing, as if the guitar itself is growing wiser with age. Whether a tonal shift is real or imagined is part of the mystique, but it’s undeniable that a nitro-finished guitar has a feel that harkens back to a romantic time in music, and for some that’s enough.
Enter the modern era, and we find a shift toward practicality—polyurethane and polyester finishes, commonly known as “poly.” These finishes, while not as romantic as nitro, serve a different kind of beauty. They are durable, resilient, and protective. If nitro is like a delicate silk scarf, poly is armor—sometimes thicker, shinier, and built to last. The fact that they reduce production times is a bonus that rarely gets mentioned. For the player who prizes consistency and durability, poly is a guardian. But in that protection, some say, comes a price. Some argue that the sound becomes more controlled, more focused—but less alive. Still, poly finishes have their own kind of charm. They certainly maintain that showroom-fresh look, and to someone who likes to polish and detail their prized possessions, that can be a big plus.
“With those changes comes a mellowing, as if the guitar itself is growing wiser with age.”
For those seeking an even more natural experience, oil and wax finishes offer something primal. These finishes, often applied by hand, mostly penetrate the wood as much as coating it, leaving the guitar’s surface nearly bare. Proponents of oil and/or wax finishes say these materials allow the wood to vibrate freely, unencumbered by “heavy” coatings. The theory is there’s nothing getting in the way—sort of like a nudist colony mantra. Without the protection of nitro or poly, these guitars may wear more quickly, bearing the scars of its life more openly. This can be seen as a plus or minus, I imagine.
My take is that finishes matter because they are part of the bond we have with our instruments. I can’t say that I can hear a difference, and I think a myth has sprouted from the acoustic guitar world where maybe you can. Those who remove their instrument’s finish and claim to notice a difference are going on memory for the comparison. Who is to say every component (including strings) went back together exactly the same? So when we think about finishes, we’re not just talking about tone—we’re thinking about the total connection between musician and instrument. It’s that perception that makes a guitar more than just wood and wire. The vibe makes it a living, breathing part of the music—and you.
Featuring a preamp and Dynamic Expansion circuit for punch and attack, plus switchable amp simulations.
"Like a missile seeking its target, Heatseeker will give you the explosive sound of rock! Inspired directly from the gear setup used by Angus Young,it features the most important sonic elements to match the tone of the short-pants-rock-God.
It’s no secret that a major role to his sound, along with the Marshall-brick walls, played one of the first wireless systems for guitar that quickly became a classic among guitar greats, the Schaffer Vega Diversity System."
The preamp along with the Dynamic Expansion circuit found in the wireless transmitter/receiver gave it its distinct sound. Besides boosting the signal, the preamp tightens up lower frequencies and slightly accentuates mid frequencies while the Dynamic Expansion circuit enhances the dynamic response and harmonics of the signal giving punch and attack to ensure that it will cut through the mix. Instead of opting for a prefix setting for the Dynamic Expansion circuit as found in the original unit, we have re-imagined our version with the enhanced knob on the Heatseeker to have more control over the guitar tone’s dynamic response. Setting it around 10 o‘clock is a good starting point to add some extra sparkle. Max it out to bring back to life even the most dull and colorless sounds.
Utilizing an all-analog JFET circuit, running on 27 volts via an internal voltage boost (DO NOT plug higher than 9V DC power supply), we have captured the tone and feel of three British tube amplifiers, synonymous with the sound of rock and roll, with an excellent clean-to-mean dynamic response. With the flip of a toggle switch, you can capture the sound and feel of a JTM45, 1959 Super Lead, or JMP 2203. A smart switching circuit follows the signal path and respective gain stages tuned for each amp and combines them with an actual Marshall style EQ and power amp simula-tion circuit for thundering rock tones. Angus Young usually plugs into Channel 1 or High Treble input of his JTM45s and Super Leads so we opted for that sound when we started visualizing Heatseeker on the drawing board. We have also extended the range of the presence control beyond the original so that the user will be able to match the pedal to any amp or gear setup. The master volume offers plenty of output so that you can also use the pedal as a preamp and plug it into a clean power amp or straight to your DAW. Note that the pedal doesn’t feature any speaker simulation circuit so we recommend using a separate hardware or software guitar speaker simulation when going direct to DAW or a full-range speaker.
A new feature to our booster/drive + amp-in-a-box line of pedals, recreating legendary sounds, is the switchable WoS (Wall of Sound) circuit. We have carefully tuned this circuit at the output of the AMP section of the Heatseeker to open up the soundstage by increasing the output, adding thundering lows, and thickening high mid frequencies. Imagine standing in front of a wall loaded with Marshall amp heads and 4x12 speaker cabinets, grabbing your SG, and hitting a chord. You will be blown away by the sound projection! In combination with the tube power amp simulation and the enhanced circuit of the right section, we’ve made sure that the pick attack will be as dynamic as it gets, so¥er picking will produce clean and slightly crunchy sounds, and hard picking will give explosive distorted sounds! While primarily designed for Angus Young sounds, Heatseeker will definitely open the door to countless other guitar-great tones that use these Marshall amps and/or the Schaffer Vega Diversity System. Think of KISS, Peter Frampton, and Van Halen to name a few.
Like our other dual overdrive/amp-in-a-box designs, Heatseeker features a passive effects loop to give you the option to connect your beloved pedals between the preamp/enhancer and amp-in-a-box circuit or use the two sections as separate and independent effects when using an external bypass switcher/looper. SND is the output of the BOOST/ENHANCE section, RTN is the input of the AMP section. SND is connected to RTN when no instrument jacks are inserted in the effects loop. Note that all pedals inserted in the passive effects loop are still in the signal chain when any or both sections of the Heatseeker are in bypass mode.
Heatseeker features a power-up bypass/engage pre-set function for the footswitches. You can change the default function by holding down the footswitch(es) during power-up. That way you can select which state your pedal will go to when you plug the power supply. This function comes in especially handy to people who use remote pedal switchers/loopers as they only set the state of the pedal once and then operate from the controller.
Street/MAP Price: $279
For more information, please visit crazytubecircuits.com.
A thick, varied take on the silicon Fuzz Face that spans punky, sparkling, and full-spectrum heavy.
Dimensional, thick variations on the silicon Fuzz Face voice. Surprisingly responsive to dynamics at most tube amp’s natural clean/dirty divide. Bass control lends range.
Thins out considerably at lower amp volumes.
$185
McGregor Pedals Classic Fuzz
mcgregorpedals.com
Compared to the dynamic germanium Fuzz Face, silicon versions sometimes come off as brutish. And even though they can be sonorously vicious, if dirty-to-clean range and sensitivity to guitar volume attenuation are top priorities, germanium is probably the way to go. The McGregor Classic Fuzz, however, offers ample reminders about the many ways silicon Fuzz Faces can be beastly, sensitive, and sound supreme.
Even though the two BC107B top hat transistors will look familiar to many who have poked around other SFF-style circuits, the Classic Fuzz is not precisely a silicon Fuzz Face clone. It’s distinguished by a low-pass filter “bass” control that true SFFs lack, but which widens its vocabulary extensively. In an A/B test with a solid, archetypal-sounding BC108 Fuzz Face clone, the Classic Fuzz sounded roughly equivalent at the 60-percent mark of the bass control’s range. But the Classic Fuzz was more dimensional, and on either side of the bass control I heard many intriguing tone variations spanning garage-punk snot and corpulent, almost triangle-Big Muff thickness.
Like most SFFs, the Classic Fuzz sounds best with a generous spoonful of amp volume. I ran it with a Fender Vibrolux just on the clean side of breakup. At amp volumes much lower than that, the fuzz voice thinned, the nuanced responsiveness to guitar volume attenuation dropped off, and the range of clean tones became much narrower. In its happy places, though, the Classic Fuzz rips—lending sparkling overdrive colors and banshee-scream aggression to Stratocasters and sounding especially sweet and terrifyingly mammoth with humbuckers