Introducing Spark MINI Vai, a portable smart guitar practice amp custom-designed by guitar icon Steve Vai. Featuring exclusive presets, a hand-signed model giveaway, and a matching lightweight cable, this amp captures Vai's iconic sound and style. Pre-order now for a chance to win a signed model.
In collaboration with guitar icon and 3-time GRAMMY® Award winner Steve Vai, Positive Grid proudly presents Spark MINI Vai, a portable smart guitar practice amp with an exclusive lightweight cable. Custom-designed by Vai himself, Spark MINI Vai captures his iconic sound and personal design touch. This unique, battery-powered amp delivers multi-dimensional sound and Vai-crafted presets, making it the ultimate rig for playing, practicing, and recording. Plus, during Positive Grid’s pre-order period, customers have a chance to receive a hand-signed model.
Steve Vai is one of the world’s most groundbreaking and influential guitarists, and Spark MINI Vai reflects his unique tone and style. The amp features a custom burgundy Tolex, custom gold piping, and a gold-lined strap, hand-picked by Vai himself. The mandala on the front grille – made famous on his Hydra guitar – pays tribute to Vai’s distinct energy and focus. Spark MINI Vai also comes equipped with a matching lightweight 10-foot guitar cable featuring 24K gold-plated connectors and a durable burgundy weave nylon jacket.
Four exclusive on-board presets created by Vai deliver the raw power of his tone. They include:
- FRESH - Crystal clear clean tone
- MILD - More bluesy clean tone with some grit
- HOT - Well-distorted rock rhythm tone
- FIRE - Full-on lead tone
In addition, Steve Vai has personally autographed 100 of these amps, which will be awarded to random recipients who purchase during the pre-order period starting 9/3/2024. Anyone who purchases during that time will be automatically entered for a chance that their order will be one of these exclusive hand-signed models.*
Commenting on his Spark MINI, Vai shares, “For me, this Spark MINI is an excellent portable practice amp. The 4 tones allow for inspirational playing and I built these presets around my interests. The app allows for instant tweakage of any of the presets. I never travel without this little friend."
Portable and battery-powered, the 10-watt Spark MINI smart guitar practice amplifier delivers surprisingly loud, multi-directional sound and features easy-to-use onboard controls. Spark MINI can also be used as a Bluetooth audio speaker for streaming music or as an audio interface for recording musical ideas.
The free accompanying app unlocks a wide selection of amps and effects plus access to 100,000+ tones and a suite of smart features for practicing and playing. Spark AI offers unlimited tone exploration. Describe any desired tone using the app and Spark AI will suggest tones to audition or download.
For more information, please visit positivegrid.com.
- Positive Grid Introduces the Spark 2 ›
- Positive Grid RIFF Review ›
- Positive Grid BIAS Rack Review ›
- Positive Grid Spark 2 Amp Review - Premier Guitar ›
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.
Kemper and Zilla announce the immediate availability of Zilla 2x12“ guitar cabs loaded with the acclaimed Kemper Kone speaker.
Zilla offers a variety of customization to the customers. On the dedicated Website, customers can choose material, color/tolex, size, and much more.
The sensation and joy of playing a guitar cabinet
Sometimes, when there’s no PA, there’s just a drumkit and a bass amp. When the creative juices flow and the riffs have to bounce back off the wall - that’s the moment when you long for a powerful guitar cabinet.
A guitar cabinet that provides „that“ well-known feel and gives you that kick-in-the-back experience. Because guitar cabinets can move some serious air. But these days cabinets also have to be comprehensive and modern in terms of being capable of delivering the dynamic and tonal nuances of the KEMPER PROFILER. So here it is: The ZILLA 2 x 12“ upright slant KONE cabinet.
These cabinets are designed in cooperation with the KEMPER sound designers and the great people from Zilla. Beauty is created out of decades of experience in building the finest guitar cabinets for the biggest guitar masters in the UK and the world over, combined with the digital guitar tone wizardry from the KEMPER labs. Loaded with the exquisit Kemper Kone speakers.
Now Kemper and Zilla bring this beautiful and powerful dream team for playing, rehearsing, and performing to the guitar players!
ABOUT THE KEMPER KONE SPEAKERS
The Kemper Kone is a 12“ full range speaker which is exclusively designed by Celestion for KEMPER. By simply activating the PROFILER’s well-known Monitor CabOff function the KEMPER Kone is switched from full-range mode to the Speaker Imprint Mode, which then exactly mimics one of 19 classic guitar speakers.
Since the intelligence of the speaker lies in the DSP of the PROFILER, you will be able to switch individual speaker imprints along with your favorite rigs, without needing to do extensive editing.
The Zilla KEMPER KONE loaded 2x12“ cabinets can be custom designed and ordered for an EU price of £675,- UK price of £775,- and US price of £800,- - all including shipping (excluding taxes outside of the UK).
For more information, please visit kemper-amps.com or zillacabs.com.
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