Neural DSP’s Nano Cortex for dyed-in-the-wool analog advocates new to the concept, is a whole rig—digital amp, cabinet simulator, effects unit, and capture device—in a box. It’s also a 24-bit, 48k Hz audio interface that can be powered by a laptop or power bank via USB-C. We reviewed the Nano Cortex upon its release in 2024. Like any new release, it left some hardcore users wanting for certain features. Some users found the effects roster underwhelming. There were also limitations about where you could situate effects relative to an amp capture. With a raft of new effects and greater flexibility, though, Neural’s 2.0.0 update addresses many concerns of power users and casual adopters alike.
Ever Evolving Technology
When the $549 Nano Cortex was released, it was a hit. The idea of a small, pocket-sized version of a Quad Cortex that weighs only 1.36 pounds—and at a third of the cost—had many guitarists drooling. But the truth is that while they are part of the same lineage, the Nano Cortex can’t match the flexibility of the Quad Cortex. This led to some confusion, and in some cases, unmet expectations.
The new, free NanOS 2.0.0 update addresses some of those letdowns with a much-expanded collection of 47 new effects—including dirt options, which, oddly, weren’t offered in the first OS version. (There is, however, only a single fuzz—a Fuzz Face emulation—which hints at the challenges of successfully modeling fuzz’s more chaotic nature.) There’s also an IR loader and global bypass to turn off IRs on all presets when you play the Nano Cortex through a real cabinet. The more customizable signal chain is also a very big deal.
The effects slots are more flexible, too. EQs and compressors can be set up in any slot—pre-or-post capture. Overdrive and wah effects can go into any pre-capture slots, while modulation, delay, and reverbs are assigned slots in the post-capture area. (The tape delay is warm, and a highlight.) Delay is only available in post-capture slot 2, before the reverb, which can only be slotted in post-capture 3 position. As you can see, NanOS 2.0.0 has opened up more possibilities, but limitations remain, especially for players that experiment with unorthodox setups.
Magic in the Clouds
Unlike the Quad Cortex, the Nano does not have a 7" touchscreen and the controls are very utilitarian. There are a few knobs and two hybrid footswitches/rotary knobs, but to really maximize the potential of the unit and manage your presets, you need to use Neural DSP’s Cortex Cloud app with your phone or tablet.
NanOS 2.0.0 has opened up more possibilities, but limitations remain—especially for players that experiment with unorthodox setups.
The app makes things way easier, and using the Nano Cortex without it seems almost unimaginable. However, if your phone is the main interface, you can’t use your phone simultaneously for other common functions like filming videos at a gig or playing backing tracks. That said, the app lets you do a lot …once you get up and running. I can generally get around the basic functions of most multi-effects modeler-type systems, but being new to the Neural DSP ecosystem, it took me some time to get a workflow going. When I got it all figured out, the app made it very easy to instantaneously control parameters, maneuver complete signal chains, and capture pedals and amps.
Captivating Captures
Using the Nano Cortex, I easily captured the hi and lo channels of my Mesa/Boogie Flux Five, as well as the vintage, modern, and combined vintage-plus-modern modes of my Wampler Dual Fusion. I initially set up a lead sound with delay from my Yamaha UD Stomp situated after the Flux Five, but learned the hard way that a “capture” is a moment in time that cannot accommodate time-based effects.
Using a Shure SM57 mic, I captured the clean tones from my Ampeg SJ12-R and vintage black-panel Fender Deluxe combos. Each capture took about three minutes and nailed the sound. Impressively, the touch-sensitive qualities of the pedals and amp were present—I could dig in hard or play soft, and feel the Nano Cortex respond just like my Dual Fusion pedal and amps. One bummer about those clean Fender Deluxe sounds, though: The new effects in NanOS 2.0.0 do not include tremolo or spring reverb—a strange omission given how many vintage Fender amps fans exist among the Neural user community. That omission aside, I enjoyed the ethereal cave reverb effect and assigned it to one of my clean captures to satisfying effect.
In addition to allowing you to capture your own gear, the Nano Cortex also comes with many preloaded captures of amps like the Mesa/Boogie JP2C, Marshall Silver Jubilee, and Peavey 5150, among many others. There are also 10 IRs and two pre-and three post-FX blocks. And the Cortex Cloud app offers a ton of free presets, which have a complete chain of captures and effects from artists like Plini and Cory Wong.
The Verdict
I recently balked at using a favorite vintage ’60s Fender tube amp for a bar gig as visions of spilled beer filled my head. Instead, I used a pretty underwhelming solid-state alternative. But if I had had the Nano Cortex, I could have used captures of that vintage Fender, a few pedals, and put the whole setup in my gig bag. That part of the Nano Cortex experience remains a game changer. But as the incremental improvements in the NanOS 2.0.0 show, there is still ground to cover.
The aptly named Kali distills elements of the Fortin Cali—a Plexi-inspired amp—into a 2-channel pre-amp and distortion pedal. Each channel has three gain modes—vintage, raw, and saturation—which are selectable via a mini toggle. And each mode has a very distinct vibe, which could be loosely categorized as low-end-heavy, midrangey, and high-gain-centric, respectively.
Charging right into Kali’s arms, I selected the vintage mode on Channel 1, and set the gain 2 knob to 9 o’clock. The gain 2 knob, which controls the gain level that hits the circuit’s front end, is the default gain knob for both channels. The gain 1 knob, which adds additional gain stages, only works on channel 2. But even at this modest setting, I was already into toothy distortion that was very touch-sensitive.
Wide Range of Rage
Without changing any other settings, things got significantly filthier by merely switching over to the saturation mode. And even at this lower-gain setting, the output is tailor-made for heavy rhythm in a classic metal jam. Pumping the gain 2 knob to around 3 o’clock, meanwhile, makes the Kali a very in-your-face proposition, with sounds rooted in Sunset Strip/Jose Arredondo Marshall-mod energy.
Interestingly, even though saturation mode has the most aggressive gain structure, it doesn’t feel especially compressed. It’s also the quietest of the three modes when tested across identical settings. This was especially noticeable when I switched between vintage and saturated modes at high gain 2 settings. It follows, then, that raw mode—the pure sound of the pedal without any extra gain stages and essentially the preamp only—is the loudest of the three modes.
Well Put Together, With a Bright Personality
Channel switching is handled by one of the two footswitches (the other
is for bypass) and it enables you to cascade one channel into another. In cascaded-stage mode, gain knob 1 is active and serves as a pre-gain (hence the gain 1 designation). In saturation mode, with both gain knobs at noon, switching between the channels sounds organic. Channel 2 is generally thicker and sustains bends for a tad longer. But the two channels definitely do not feel haphazardly thrown together. They are clearly cut from the same cloth.
“[It’s] a very in-your-face proposition, with sounds rooted in Sunset Strip/Jose Arredondo Marshall-mod energy."
In general, the Kali is bright, but if you need brighter, there are a pair of 3-position bright switches for each of the two channels. At low output volumes the changes offered by these bright switches are noticeable but not too dramatic. They are much more pronounced at high output volume. The active +/- EQ knobs actually have much greater impact on the Kali’s personality—particularly in the zones between 9 and 3 o’clock, where minor tweaks yield very different tonal realms.
The Verdict
The Kali comes across as a cohesive whole, yet its interactive controls and powerful EQ unlock a wide range of Plexi and modded-Plexi tones. No matter how you set it, it sounds impressive.
Like the Silver Sky, the NF 53 revealed Paul Reed Smith’s deep reverence for classic Fullerton designs and curiosity about how to expand on those templates. 2023’s NF 53 release left us impressed, and it was only a matter of time until an offshore-built SE model followed. That time has come: The SE NF 53 is here, dressed in the same lines and livery as the USA-built model, but at a more affordable price point thanks to PRS-licensed and supervised manufacturing by the Cor-Tek Musical Instrument Co. in Indonesia.
Like the NF 53, the SE model is more a riff on the Telecaster theme than a copy. Unburdened by tradition, PRS carved away at every line of the single-cutaway form, and the electronics are very much about enhancing versatility, rather than reducing componentry to the absolute basics. Even so, the SE NF 53 still drips with Tele-ness.
Single-Cut Minded
T-style traditionalists will find much that feels familiar, like the 25.5" scale length and bolt-on maple neck. From there, though, the SE NF 53 deviates from vintage T-style spec pretty quickly. There are 22 medium-jumbo frets, and the neck is constructed with a scarf joint that increases strength at the headstock break. The maple fretboard is sliced away from the neck and reglued after installation of the truss rod. Its width at the nut falls between Gibson and Fender camps at 1 41/64". The 10" radius also splits the difference between vintage Gibson and Fender specs, and it all feels great in hand courtesy of a rounded-C profile that measures about .87" deep at the first fret. The guitar’s overall weight is around 8.1 lbs.
In Telecaster style, the SE NF 53’s body is made from swamp ash—in this case, using 3-piece construction. It features belly and forearm contours, and a contoured cutaway for easier upper-fret access. PRS maximized the drama of the ash’s distinctive grain with a white doghair finish on our review sample, and black grain filler makes the wide, rippling lines pop and weave beneath the white. They reverse the effect entirely on the black doghair version, and hide the grain entirely on the pearl white finish.
In the hardware department, the SE NF 53’s bridge nods to a vintage Telecaster’s brass barrel saddles, but it uses a steel-base design with string-anchor notches rather than through-body stringing. It also deviates from T-style tradition by assigning three strings to a saddle with two adjustment bolts, rather than three saddles with two strings each.
Like the USA model before it, the SE NF 53 is fitted with a pair of PRS’s Narrowfield DD pickups, although these are the “S” variant, which are designed to enhance low-end tones while retaining snarl and twang. The “DD” stands for deep dish, meaning these single-coil-sized humbuckers are made with deep bobbins to enable extra coil windings, using a mix of magnet pole pieces with steel poles in between. They are wired through master volume and tone controls and a three-way selector switch on a plate that nods toward the late ’60s Fender Telecaster Thinline.
Taken together, the SE NF 53 is a cohesive design, made stronger by its robust build quality. There’s no real lack of refinement in evidence when compared to the USA model. Some of the woods and components are a different grade, but the overall result is a guitar that lends a sense of confidence.
Field Day
Plugged into a Fender Bassman head and 2x12 cab, a Vox AC15 1x12 combo, and a Fractal FM9 into headphones, the guitar reveals a genuine alternative to the T-style formula suggested by its components. Its character is distinctly its own—and with noticeably less hum.
The Narrowfield DD “S” pickups play a big part in the guitar’s success. The easiest reference point I can think of might be a blend of Telecaster and P-90 tonalities, but with plenty of their own thing going on. With a clean amp or setting there’s a meaty growl on top of the twang. Yet the guitar isn’t short on bright, sparkly chime, and sounds alive in those frequencies without being strident or spikey. This sonic foundation puts edge-of-breakup tones right in the SE NF 53’s wheelhouse, where the chewy bite segues into a little bit of breakup when you hit it hard. And it’s just as comfortable with high-gain tones, where the same sonic characteristics that contribute sweetness in cleaner settings enable clarity and cutting power while avoiding harshness in the highs. In fact, the guitar is at home in so many settings, sharing a Telecaster’s versatility and its effortless ability to handle almost anything with style.
The Verdict
The NF 53 platform is a very likeable tribute to the seminal T-style without trying to replicate it and, as a result, it’s versatile and inspiring guitar in its own right and in its way. And in the SE version of this design it delivers at a price that belies its vocabulary and its confidence.
As the leaves change and the holiday season approaches, PG contributor Tom Butwin highlights standout pedals from the bevy of tone machines that graced shelves this year. In his first installment of Pedalmania, hear demos of the flexible Keeley Manis Overdrive, Mr. Black's DoubleTracker Stereo, the spacey new Hotone Verbera convolution reverb, and the featured-packed NUX Amp Academy Stomp.
There are more flexible means for mashing up fuzz and delay thanBenson’s Deep Sea Diver. And in a time of preposterously low-priced pedals, there are more economical methods, too. But there’s no guarantee that a more traditional and cost-conscious path will yield results as interesting—or inspirational—as those offered by the Deep Sea Diver. It’s a pedal that often serves up zigs where you seek zags—depending on your sense of adventure and creative latitude, it can feel versatile, forgiving, and full of exciting surprises.
Bathyspheric Battiness
The Deep Sea Diver was developed withJessica Dobson, who fronts the band that shares the pedal’s name—and for whom more unusual applications of the fuzz/delay equation are a sonic cornerstone. The basic architecture of the Deep Sea Diver makes a great departure point for any player keen to ply the odder corners of that stompbox formula. It’s hard to know firsthand exactly what that architecture is—Benson flipped the circuit board so that you don’t see components, but rather a stylized representation of Dobson’s face in silhouette. (For the record, the solders you can see all look exceptionally tidy).
Chris Benson says that the 3-transitor fuzz section of the circuit uses a mutant mix of the 2-transitor Tone Bender MK 1.5 and the 3-transistor Tone Bender MK 2.0 as a foundation. Dobson says she envisioned a less hectic version of the ZVEX Fuzz Factory—a relation borne out here by the gate and bias controls. The delay section, meanwhile, is built around a PT2399 chip. This is a device many builders have put to creative use in spite of first turning up in karaoke machine delays. Its sonic signature—lo-fi, hazy—can be similar to that of bucket brigade delays, but still occupies a different lane than the analog EHX Memory Man and Diamond Memory Lane devices that underpin Dobson’s rig. As a whole then, the Deep Sea Diver doesn’t really replicate any particular part of Dobson’s tone recipe as much as it adds a new color formed in the spirit of where her playing has been and where it might be going.
One Deep Sea Diver feature that is a fixture of Dobson’s tone is a delay that is situated before the fuzz—except for when it isn’t. By holding down the bypass switch while powering up, you can reverse the order of the effects. If you’ve never experimented with switching fuzz and delay, the results can be revelatory.
Submarine Flip Flops
Given how interesting it is to move between the order of effects on the Deep Sea Diver, it’s a shame that you can’t make the switch without powering off the unit. Obviously, that’s not the most complicated process, but it’s also not one you’ll attempt in the middle of a song or set. Many pedals enable effect-order switching via a toggle or alternate footswitch input. In this case, the latter possibility was difficult for good reason, as pressing and holding the footswitch activates an endlessly entertaining runaway oscillation effect.
To a passively listening bystander, a switch in fuzz/delay effects order isn’t always glaringly obvious. In a very general sense, fuzz before delay results in greater clarity, and vice versa. But on the Deep Sea Diver, situating the delay before the fuzz lends a gauzy, foggy smear around the edge of transient notes and the repeats that you feel as much as hear. Comparing the Deep Sea Diver to a bucket brigade delay and a ZVEX Fuzz Factory, you can hear why Chris Benson employed the PT2399 chip. There’s a slightly more lo-fi blur to the Deep Sea Diver’s delay signature, which, to my ears, lends extra mystery.
One Deep Sea Diver feature that is a fixture of Dobson’s tone is a delay that is situated before the fuzz—except for when it isn’t.
But it’s the fuzz section of the Deep Sea Diver that really expands its performance envelope. The gate and bias controls both have impressive range and work together pretty seamlessly to broaden the pedal’s fuzz voice. There are lots of collapsing, fractured fuzz-on-the fritz and dying-AM-radio sounds made more appealing by the smoky delay signal. You’ll find many shades of super-cool mid-1960s buzz, too. But it’s also capable of unique, punchy drive sounds that hit hard and are easy to compose with, and situate in a mix without sounding entirely unhinged. The Deep Sea Diver will happily go bonkers if that’s what you’re after though, and as you get a feel for the way the gate and bias controls interact you might not even miss the conspicuously absent gain level control—which, I venture, would complicate matters significantly.
The Verdict
I played the Deep Sea Diver next to a few different fuzz/delay combinations, and there is an audible cohesiveness in the two effects at the Benson's core. Furthermore, the resulting dovetailed fuzz/delay voices lend the Deep Sea Diver a truly individual voice at many settings. Though it falls short of mimicking the butter-smooth sustain of, say, a Big Muff and a Boss DD-5, it can still dish many rich fuzz tones in that spirit—just a bit filthier. The Deep Sea Diver is most certainly eccentric, just as its creators no doubt intended. But it’s not exclusively weird. There are plenty of sounds here for classicists, even if the Deep Sea Diver tends to beckon the player toward more unorthodox ends.