A smart, potent boost that’s much more than meets the eye.
A well-built and truly great-sounding boost/line-driver pedal boasting a handful of clever bonus functions.
Some buyers might find it a little pricey.
$199
Source Audio ZIO
sourceaudio.net
Source Audio nicknamed the new ZIO pedal “the Better Box,” which is a fair summation of what this thing will do for your tone. Purists may rant endlessly about the virtues of plugging straight into an amp. But many legendary players understood that a little extra “hot” between guitar and amp can add up to magic. From Jimmy Page’s Echoplex preamp to Brian May’s Rangemaster to Angus Young’s Schaffer-Vega wireless system, a lot of signature sounds have been shaped with a little extra kick—and often from unexpected sources that are something other than simple boosts. Source Audio’s first all-analog pedal is more than a conventional booster, too. And, to some degree, it celebrates these alternate paths to boosting tone.
Designed in collaboration with Christopher Ventner of SHOE Pedals, ZIO is short for Impedance (“Z” in electro-speak), Input, and Output, which hints at the front-to-back thinking behind the design. The pedal’s input impedance is calculated to optimize the signal from a traditional high-impedance guitar pickup and send it down the line as a sweetened low-impedance version of itself. In doing so, ZIO helps your signal survive long chains of pedals and cable runs. Four selectable modes each offer up to +20 dB of gain and three levels of cable-mimicking capacitance to subtly brighten or darken your tone as desired.
All recordings using a Novo Serus J guitar set to the bridge pickup (an Amalfitano P-90), into a Friedman Mini Dirty Shirley set to clean and 1x12 cab. Zio pedal set at 50% output, Tone on Bright.
- 0:00 – ZIO pedal off.
- 0:08 – ZIO on, JFET setting.
- 0:44 – Change to Sudio setting.
- 1:04 – Change to E-Plex setting.
- 1:24 – Pedal off again.
Got Some Front
Though its methods for tone shaping might seem slightly esoteric on the surface, ZIO is easy to use. The knobs are a single control for output level and a 4-position rotary switch, dubbed circuit, which selects the preamp voicing. The JFET mode uses Burr-Brown op amps to generate a transparent, low-distortion boost, mimicking the response of a clean tube amp input. Low-cut mode reduces frequencies that can cause mud and rumble, lending more presence. Studio mode successfully replicates the effect of using a Pultec compressor to cut muddy lower-mids and enhance presence. The E-Plex mode, meanwhile, replicates the rich, clear, and just slightly colored sound of a vintage Echoplex preamp.
Source Audio is mindful of the fact that a long cable’s capacitance is an essential part of some players’ overall sonic brew, and that a booster/line-driver in front of the chain can negate the capacitance effect. So ZIO includes a tone toggle that offers three levels of cable-capacitance emulation. Bright represents a low-capacitance load and the brightest tone—as you might hear from a very short, high-quality cable. Med approximates a 15-foot cable and softens highs just a bit. Dark achieves the mellowing effect of longer or coiled cables.
A 2-position mini-toggle to the right is specifically tailored for players that will keep ZIO on at all times and allows the user to configure the footswitch as a mute function in place of the traditional off setting. That means one of the two outputs on the left side of the pedal can feed a tuner running independent of the signal chain or deliver a line-level signal to any amp, console, interface, or input that you want to keep live while muting the main output. Nine-volt DC power feeds the ZIO, with a center-negative input on the crown. It’s all housed in a rugged brushed-aluminum enclosure that’s not quite mini-pedal small but compact at 4" x 2.3" x 2.2" tall (including the knobs).
I fast fell I love with ZIO’s variety of boost tones and easy integration into my pedalboard.
All Lined Up
I fast fell in love with ZIO’s variety of boost tones and easy integration into my pedalboard. It flat-out sounds fantastic. Some players will no doubt consider ZIO pricey for a booster pedal with a few extra bells and whistles. But the enhanced tones will be well worth it for many guitarists, even if they only ever use one circuit mode.
That said, switching between the circuits is half the fun. And at times I fantasized about a rig based on two ZIO pedals: One that I could use as a transparent always-on line driver and tone juicer, and another as a proper boost. Used in the latter application, ZIO made my tweed-style combo bite and break up a lot more readily. It was also secret sauce for a Friedman Mini Dirty Shirley, making its Plexi-style crunch and lead tones extra delectable. While all four preamp-emulating modes proved effective—and I could certainly find many useful applications for each—I really fell for the Pultec-inspired studio mode. It’s sweet, juicy, clear, and articulate, and it simply makes everything more luscious. It can also offer a playful dose of extra drive when you crank the output past 11 o’clock. It sounds fantastic as an amp-input driver in this setting. The tone switch settings are pretty subtle, but that’s the idea: You use it to fine tune the feel and character of the signal once you’ve dialed in the other functions to near-perfection.
The Verdict
Boosts are often one-trick ponies. But Source Audio and Christopher Ventner’s sly and very smart selection of features make ZIO a whale of a tone enhancing machine—and a sneakily versatile one at that. Yes, the ZIO is a simple device in principle, but it does what it does exceptionally well. And while many players will regard the tone switch and switch modes as minor bonus features, I suspect they will prove invaluable to many exacting tone crafters and super-functional in some rigs. For me, at least, they help make ZIO one of the tastiest boost pedals I’ve tried in quite some time.
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The legendary Elvis sideman was a pioneer of rockabilly guitar, and his approach to merging blues and country influenced generations of guitar pickers. Here’s how he did it.
Chops: Intermediate
Theory: Beginner
Lesson Overview:
• Craft simple blues-based phrases that lie within the CAGED system.
• Understand how double-stops are used in rockabilly music.
• Improve your Travis picking.
Click here to download a printable PDF of this lesson's notation.
In 2016 we lost one of the most influential guitarists and unsung heroes the world has ever known. The driving force behind Elvis Presley’s first recordings, Winfield Scott “Scotty” Moore III helped shape the sound of rock ’n’ roll and inspire generations of fans. Born in 1931, Scotty caught his big break in 1954 when he was called to do a session with Elvis at Sam Phillip’s Sun Studio in Memphis. History was made that day when Elvis recorded “That’s All Right,” and for about four years, Scotty provided 6-string magic for such Elvis hits as “Heartbreak Hotel,” “Hound Dog,” and “Jailhouse Rock.”
A huge Chet Atkins fan, Scotty grew up listening to country and jazz. This blend would have a dramatic impact on his sound, as he would mix Travis picking with some ear-twisting note choices based on chords, rather than using an obvious scalar approach.
I used a thumbpick on the examples in this lesson to sound as authentic as possible. Using a thumbpick on some notes makes them stand out in comparison to those plucked with the remaining fingertips. Ex. 1 is a classic Scotty-type rhythm riff in E that uses some Travis picking. Play the notes on the 6th and 4th strings with your thumb, and use your index and middle fingers for the double-stops on the 3rd and 2nd strings. This is illustrated in the notation: Attack all the up-stemmed notes with your fingers and down-stemmed notes with your thumb.
Click here for Ex. 1
The next example (Ex. 2) reveals one of the more common elements of Scotty’s lead work: double-stops. It makes sense when you consider that Scotty often performed with just a bass player and drummer, so when it came time to play a solo, he needed to create a strong sense of harmony. The first three phrases begin in the “E” shape of the CAGED system before moving down to the “A” shape and returning to the “E” shape. Those last two measures sit squarely in the “E” shape at the 12th position.
Click here for Ex. 2
Ex. 3 returns to Scotty’s Travis-picking influence by outlining an A chord before leading the idea in a new direction with double-stops. The example begins in the “C” shape and resolves in the “E” shape, though this wouldn’t have meant anything to the legendary guitarist. However, his reliance on moving the five basic chord shapes around the neck is undeniable.
In this version of “Hound Dog”—a song originally recorded by Big Mama Thornton—Moore takes a bluesy solo starting at :45.
Click here for Ex. 3
The blues was an essential part of Scotty’s style, and Ex. 4 shows something he might play over the first eight measures of a blues in E. To use the moves in any given key, it’s important to understand how intervals work within a chord. For example, over the E7, I’m approaching the root and 3 (G#) with a half-step slide. With that information, you’re able to transpose this musical shape all over the neck. Approach each double-stop with this method, and you’ll get a lot of mileage out of this rather simple lick.
Click here for Ex. 4
Ex. 5 shows some of Scotty’s single-note ideas, though the phrase still begins with a double-stop on the top two strings to grab the listener’s attention. Measures three and four use a strange collection of notes. Scotty isn’t thinking of a scale here. The phrase begins with a bluesy flourish and a melodic descent to the root. When he gets there, he moves down a half-step to the 7 (an unusual note to play on a dominant chord, but if it sounds good, it is good), and then up again to resolve to the A chord.
Click here for Ex. 5
Scotty was also a big fan of using three-note grips. In Ex. 6, you can see how these ear-grabbing sounds would work over our blues progression. It begins with an E triad in the “D” shape. It’s genuinely amazing how many great chordal licks Scotty could come up with by using just a few chord forms.
Click here for Ex. 6
Ex. 7 is a little trickier, but a great example of how to move from an A chord to an E chord using some double-stops and single notes along with position shifts and sixths. This is very much a country phrase and evidence of the genre’s importance to the rockabilly sound.
Click here for Ex. 7
The final example (Ex. 8) is a longer, 20-measure piece outlining a full progression with Scotty's superb Travis-picking ideas. While this isn’t a column specifically on Travis picking with a collection of exercises to develop that skill, here are a couple of simple tips that should help you navigate this music.
First, focus only on the bass notes. The thumb needs to be automatic. Strive to put no thought into playing the bass part. This takes time but eventually you’ll be free to concentrate on the melody. The last part to absorb is the excellent ending chord. It’s a maj6/9 with the root on top—very common in the rockabilly style.
Click here for Ex. 8
From here it’s easy to hear Scotty’s immense influence on guitardom. It would be well worth your time to go down a rabbit hole of YouTube vids from the CAAS (Chet Atkins Appreciation Society) conference. Nearly every player from that scene owes a debt to Mr. Moore.
Nashville's historic Gruhn Guitars give PG an exclusive look at a very early amp that is a piece of rock history that preceded the heralded JTM45. Amp builder and reverb aficionado Eric Borash of Ebo Sounds shares his expertise on this rare amp's lineage, while John Bohlinger plugs in Dan Auerbach's old '60s ES-335 to test it out.
Metallica's M72 World Tour will be extended into a third year with 21 North American shows spanning April, May, and June 2025.
The M72 World Tour’s 2025 itinerary will continue the hallowed No Repeat Weekend tradition, with each night of the two-show stands featuring entirely different setlists and support lineups. These will include the band’s first Nashville shows in five years on May 1 and 3 at Nissan Stadium, as well as Metallica’s return to Tampa after 15 years on June 6 and 8 at Raymond James Stadium. M72 has also confirmed its much anticipated Bay Area hometown play, to take place June 20 and 22 with the band’s debut performances at Levi's Stadium in Santa Clara.
In a new twist, M72 2025 will feature several single shows bringing the tour’s full production, with its massive in-the-round stage, to venues including two college football stadiums: JMA Wireless Dome in Syracuse, New York on April 19, and Metallica's first ever visit to Blacksburg, Virginia, home of the Virginia Tech Hokies. The May 7 show at Lane Stadium will mark the culmination of 20+ years of “Enter Sandman” playing as the Hokies take the field.
In addition to playing football stadiums across the nation, the M72 World Tour’s 2025 itinerary will also include two festival headlines—the first being the opening night of the run April 12 at Sick New World at the Las Vegas Festival Grounds. May 9 and 11 will then mark a festival/No Repeat Weekend combo as Metallica plays two headline sets at Sonic Temple at Historic Crew Stadium in Columbus, Ohio.
Support on M72’s 2025 North American run will come from Pantera, Limp Bizkit, Suicidal Tendencies and Ice Nine Kills. See below for specifics.
Additionally, M72 2025 will see Metallica’s long-awaited return to Australia and New Zealand.
M72’s 2025 North American leg is produced by Live Nation and presented by new sponsor inKind. inKind rewards diners with special offers and credit back when they use the app to pay at 2,000+ top-rated restaurants nationwide. The company provides innovative financing to participating restaurants in a way that enables new levels of sustainability and success. Metallica fans can learn more at inkind.com.
Citi is the official card of the M72 tour. Citi cardmembers will have access to presale tickets beginning Tuesday, September 24 at 10am local time until Thursday, September 26 at 10pm local time through the Citi Entertainment program.
Verizon will offer an exclusive presale for the M72 tour in the U.S through Verizon Access, just for being a customer. Verizon Access Presale tickets for select shows will begin Tuesday, September 24 at 10am local time until Thursday, September 26 at 10pm local time.
* Citi and Verizon presales will not be available for Sick New World, Sonic Temple or the Toronto dates. Verizon presale will not be available for the Nashville, Blacksburg or Landover shows.
As always, a portion of proceeds from every ticket sold will go to local charities via the band’s All Within My Hands foundation. Established in 2017 as a way to give back to communities that have supported Metallica over the years, All Within My Hands has raised over $15 million – providing $8.2 million in grants to career and technical education programs including the ground-breaking Metallica Scholars Initiative, now in its sixth year, over $3.6 million to combat food insecurity, more than $3.5 million to disaster relief efforts.
For more information, please visit metallica.com.
Metallica M72 North America 2025 Tour Dates
April 12 Las Vegas, NV Sick New World @ Las Vegas Festival Grounds
April 19 Syracuse, NY JMA Wireless Dome *
April 24 Toronto, ON Rogers Centre *
April 26 Toronto, ON Rogers Centre +
May 1 Nashville, TN Nissan Stadium *
May 3 Nashville, TN Nissan Stadium +
May 7 Blacksburg, VA Lane Stadium *
May 9 Columbus, OH Sonic Temple @ Historic Crew Stadium
May 11 Columbus, OH Sonic Temple @ Historic Crew Stadium
May 23 Philadelphia, PA Lincoln Financial Field +
May 25 Philadelphia, PA Lincoln Financial Field *
May 28 Landover, MD Northwest Stadium *
May 31 Charlotte, NC Bank of America Stadium *
June 3 Atlanta, GA Mercedes-Benz Stadium *
June 6 Tampa, FL Raymond James Stadium +
June 8 Tampa, FL Raymond James Stadium *
June 14 Houston, TX NRG Stadium *
June 20 Santa Clara, CA Levi's Stadium +
June 22 Santa Clara, CA Levi's Stadium *
June 27 Denver, CO Empower Field at Mile High +
June 29 Denver, CO Empower Field at Mile High *
* Pantera and Suicidal Tendencies support
+ Limp Bizkit and Ice Nine Kills supp
Beetronics FX Tuna Fuzz pedal offers vintage-style fuzz in a quirky tuna can enclosure.
With a single "Stinker" knob for volume control and adjustable fuzz gain from your guitar's volume knob, this pedal is both unique and versatile.
"The unique tuna can format embodies the creative spirit that has always been the heart of Beetronics, but don’t let the unusual package fool you: the Tuna Fuzz is a serious pedal with great tone. It offers a preset level of vintage-style fuzz in a super simple single-knob format. Its “Stinker” knob controls the amount of volume boost. You can control the amount of fuzz with your guitar’s volume knob, and the Tuna Fuzz cleans up amazingly well when you roll back the volume on your guitar. To top it off, Beetronics has added a cool Tunabee design on the PCB, visible through the plastic back cover."
The Tuna Fuzz draws inspiration from Beetronics founder Filipe's early days of tinkering, when limitedfunds led him to repurpose tuna cans as pedal enclosures. Filipe even shared his ingenuity by teachingclasses in Brazil, showing kids how to build pedals using these unconventional housings. Although Filipe eventually stopped making pedals with tuna cans, the early units were a hit on social media whenever photos were posted.
Tuna Fuzz features include:
- Single knob control – “Stinker” – for controlling output volume
- Preset fuzz gain, adjustable from your guitar’s volume knob
- 9-volt DC operation using standard external power supply – no battery compartment
- True bypass switching
One of the goals of this project was to offer an affordable price so that everyone could own a Beetronicspedal. For that reason, the pedal will be sold exclusively on beetronicsfx.com for a sweet $99.99.
For more information, please visit beetronicsfx.com.