Walrus Audio’s Monumental Harmonic Stereo Tremolo is far from the only modern tremolo pedal that offers stereo panning. And it’s one of many that digitally approximates the elastic, phasey sound of brown-panel Fender harmonic tremolo. But the Monumental’s economical design and compact dimensions conjure memories of PN-2s I’ve known and missed. It brims with features an old PN-2 user could only dream of in the midst of a stereo amp reverie: the harmonic tremolo, a more traditional optical tremolo-style voice, the ability to blend the two, six wave shape options, and a subdivision switch that enables precise rhythmic variations on any given modulation pattern.
Rhythms Carved in Rock
The Monumental is, as any Walrus-watcher will know, is an evolution of theMonument, which was built around harmonic and optical-inspired tremolo voices, and features tap-tempo, subdivisions, and five waveform types. So, the big news here is the stereo capacity, presets, and the ability to blend the harmonic and optical tremolo types. You’ll pay 60 extra bucks for these extended capabilities. But if you really get into using tr-molo to its fullest potential, these are no small matters.
“The big news here is the stereo capacity, presets, and the ability to blend the harmonic and optical tremolo types.”
The Monumental uses the same-sized enclosure as the Monument V2. The only real drawback from this layout is the proximity of the tap-tempo switch to the bypass, and, as I was reminded at a jam last week, I for one, can easily miss my footswitch target if I’m deeply involved in a musical moment. That issue aside, the Monumental is impressive for the way it accommodates stereo in and out jacks, a tap and expression pedal jack, six knobs for volume, wave shape, stereo pan spread, rate, depth, and the optical/harmonic blend. The subdivision button is situated just below these and is easy to access and operate. None of it, save for the footswitches, feels cramped or difficult to navigate.
Soaring Skyward
It’s good that Walrus added presets to the Monumental, because while it can often seem subtle, the deeper you venture into the possible textures, the more detail and difference you hear among them. Waveforms like the square and sine wave sound great at low- and medium-depth settings. Other options benefit from a more-aggressive depth setting. I tended to like the optical and harmonic tremolo voices in their purest forms, but you can find many intricacies to probe and unravel in the blended settings. Some of those differences might go missing in the wash of a dense arrangement, but when they breathe in more spacious musical settings they are lovely. This is especially true when you use the pedal in stereo.
If you don’t intend to use the Monumental in stereo, you should carefully consider whether the presets and blendable voices merit the extra expenditure. For many, they will. But using the Momumental in mono alone means missing out on some of the pedal’s most infectious sounds. While square, sine, sawtooth, and random waveforms sound particularly exciting here, the other waveform types bubble and percolate all over the stereo field, often sounding percussive in optical mode and woozy in harmonic settings. Maximum depth settings sound particularly immersive. You can also enhance the effects of a dramatic stereo spread by equalizing your two amps differently. I boosted the bass and removed most of the treble from a black-panel Fender and did the inverse with a Vox-style amp for my stereo experiments. The resulting combination of detailed pick attack, strong transients, and peaky top-end popping over a fat, rubbery foundation sounded liquid and surreal—even with the pronounced treble peaks in the mix—making an already basically rich tremolo voice sound extra three-dimensional. By the way, yes, I tried the “How Soon Is Now” riff through a stereo setup. And yep, it sounded fantastic.
The Verdict
At $279, you will want to ask yourself how much tremolo you intend to use before you invest in the Monumental. There are certainly simpler ways to swamp-rock. The Monumental also lives at the more expensive end of its category—coming in a little pricier than pedals like the Keeley Hydra and the crazy-feature-rich EHX Super Pulsar. But there’s no contesting the high quality of this USA-made pedal or the thoughtful way the sounds within were conceived. And studio rats and texture obsessives that love the sensation of swimming in a stereo field may find the Monumental worth every penny.
Walrus Audio Monumental Stereo Harmonic Tap Tremolo - Orange
Olivia Rodrigo’s Guts was last year’s pop-rock album of the year, with singles like “All-American Bitch,” “Get Him Back!,” and “Bad Idea Right?” igniting a revival of early-’00s pop-punk, but with quite a bit more nuance and grit.
Rodrigo’s tour behind the critically acclaimed record has been rolling around the world since February. To bring it on the road, the star has hired guitarists Emily Rosenfield and Daisy Spencer, along with bassist Moa Munoz. PG’s Chris Kies caught up with the three musicians before Rodrigo’s show at San Francisco’s Chase Center in early August to see what gear powers the pop-rock machine.
Special thanks for helping out to guitar techs Luis Munoz and Maurizio Pino.
Brought to you by D’Addario.Aye Aye, Captain
Among a stable of sharp, fun axes, Rosenfield, who also plays with Rina Sawayama and has played guitar for Broadway productions of Rent and Hamilton, favors this eye-catching Gibson Kirk Douglas Signature SG. Strung with Ernie Ball Paradigm strings, the triple-humbucker configuration carries a fair bit of Jack White mojo—a great fit given White’s oddball influence on Rodrigo’s barbed take on pop-rock.
Black Cat
Spencer’s number-one is this Shabat Guitars Leopard, built by Los Angeles-based luthier Avi Shabat. The Jazzmaster-style guitar, which also takes Ernie Ball Paradigms, covers some shoegaze tonal territory that crops up through the carefully programmed set.
Rick Rock
As a teen in Sweden, bassist Moa Munoz grew up on a steady diet of rock and metal, and Rickenbacker basses seemed like the right tool for those jobs. She delivered mail to save up for this 1981 Rickenbacker 4001, and it’s still her top choice.
Kemper Tantrum
Munoz runs an onstage amp rig—powered by a Mesa Boogie Subway D-800 head and matching cab—but supplements that with a Line 6 Helix Rack and Control system. Spencer and Rosenfield run through Kemper Profiler systems, with Kemper Profiler Remote units at their feet to dance through their sound changes. They cover everything from acoustic ballads to sparkly cleans to alien octave jumps to full-on grunge sludge, so tune in to hear snippets of the sonic spectrum.
Shop Olivia Rodrigo Band's Rig
Kemper Profiler
Kemper Profiler Remote
Shure AD4Q
Radial JX42 V2
Line 6 Helix Rack
Line 6 Helix Control
Mesa Boogie Subway D-800
Gibson Hummingbird
Gibson Les Paul Standard
Gibson Kirk Douglas Signature SG
Fender Stratocaster
Fender Acoustasonic Player Jazzmaster
Ernie Ball Music Man Valentine
Fender American Professional II Precision Bass
Guild Starfire I Bass
Ernie Ball Paradigm Strings
Ernie Ball Hybrid Slinky .045-.105
There was something about the song that was unique and I wanted to dig into. And because I needed inspiration for a new lesson, the timing was perfect. The first thing I like to do when figuring out how a tune works is to lay out the main chords as an inventory. For this tune, the chords are pretty simple:
Am–G–D–Am
Yet again, Tom Petty takes a simple harmony and crafts an enduring rock anthem around it. We all joke about three-chord rock, but this is not only three-chord rock, it’s modal as well. So, why is this a Dorian chord progression? Just looking at the chords might be enough if you’d studied harmony a ton, but if you haven’t, the next step we should take is to spell out the chords into their individual notes:
Am = A C E
G = G B D
D = D F# A
Now that we’ve deconstructed the chords, the next task is to decide which note you think is home, or in theory-speak, the I. In this case, it’s pretty clear that A is home. We keep coming back to it, and it really does feel and sound right. With that done, we can take the chord tones and alphabetize them, starting with A. This yields a string of seven notes: A–B–C–D–E–F#–G.
Okay, we’ve taken inventory of all the notes contained in those three chords, starting from our root (A). The next step is to ponder the harmonic consequences of this discovery. What makes this a Dorian progression is the D major chord with an Am tonic. This D triad brings us an F#, which is not the normal F you’d see in an A Aeolian, aka A natural minor, scale (A–B–C–D–E–F–G). With Dorian, you end up with a scale that sounds minor, but with a raised 6, compared to natural minor. This yields an intriguing sound that’s not quite as dark as the minor scale you’re accustomed to. Many people describe and teach Dorian as a minor scale with a raised 6, and that’s exactly what we have here.
To get familiar with this sound, grab “Last Dance with Mary Jane” on your favorite music service and play along in A Dorian. Ex. 1 shows a handy scale diagram based on the 5th fret root of A on the 6th and 1st strings.
Now that we’ve connected the chords to the Dorian mode and we have a scale fingering, let’s hear some riffs in context.
For Ex. 2, I’m keying off the fact that this Dorian scale position is in the same spot as the familiar minor pentatonic scale, so we’re getting to use both the mode and the pentatonic in the same phrase. I’m featuring the F# (or the 6) as the signature note that makes Dorian unique, and also because it’s the 3 of the D major chord. You can play that F# whenever you want in this progression, but it’s extra awesome over the D chord.
Click here for Ex. 2
With its bluesy beginning, Ex. 3 is another line that relies on the pentatonic scale lurking inside of the Dorian scale. Again, when the D major chord occurs in the second measure, I’m calling attention to it with the F#. It’s a simple way to connect with the Dorian scale and still keep that rock/blues feel we all love.
Click here for Ex. 3
For our final example (Ex. 4), I stayed away from the pentatonic sound and tried to create a simpler melody with just the Dorian scale. It starts in the middle of the guitar’s range and follows a see-saw pattern of “go up a few, go down a few.” At the start of each chord change—every two beats—I align to the chord in the progression: A for the Am chord, G for the G chord, and F# for the D chord. This is a little bit of voice-leading that reminds me of “While My Guitar Gently Weeps.” It not only helps you anchor the chord progression, but it connects with the mode at the same time. We’re only using a portion of Ex. 1’s two-octave scale pattern—sometimes simple is best.
Click here for Ex. 4
But wait there’s more! While the opening chords clearly spell out an A Dorian progression, the chorus shifts to yet another modal key. This song keeps on giving us things to learn and practice—how cool. When the chorus starts, we hear the following chords:
Em–A–Em–A–G
As before, let’s pull the chords apart to see what’s inside:
Em = E G B
A = A C# E
G = G B D
And just like last time, we need to determine the root. In this case, it’s clearly E minor, so we’ll call this an E something mode. Starting with E, let’s ascend through the pitches to see what we get:
E–G–A–B–C#–D
This gives us six notes. While we’re missing the second note after E (which, in a seven-note scale, would be some type of F), we can still conclude it’s another Dorian scale, this time in the key of E. Relative to E, C# is a raised 6 and this matches our general idea of Dorian construction: minor scales with a raised 6. It’s really cool that this song allows you to practice in two keys, A Dorian for the verse and E Dorian (E–F#–G–A–B–C#–D) for the chorus.
Ex. 5 is a scale diagram for E Dorian. Note that it’s the same pattern as our previous A Dorian scale, just shifted up to the 12 fret to place the E root on the 6th and 1st strings.
The chorus is my favorite part of the song because it’s a moment where everything comes together—the chords and Petty’s vocal melody combine for a beautifully haunting Dorian sound. Pay attention to the “ry” in the melody of “Mary” to hear that C# over an Em chord—that’s the distinctive Dorian color at work. It’s one of the reasons I’ll keep this song in my arsenal of material for teaching Dorian to students, along with Pink Floyd’s epic “Breathe” from Dark Side of the Moon. (Go work out the Dorian key for that one.) For now, use the above examples for inspiration and find your own riffs and ideas for “Mary Jane.” Let your creativity and ears be your guide.
I hope you enjoyed exploring how to reverse-engineer a simple song. Over time, this process will become faster and you’ll be able to hear the modes more easily. The next time a tune really tickles your ear, take it apart as we’ve done here. Who knows? It may spawn a soloing concept or a song idea you wouldn’t have otherwise considered.