Neural DSP built its reputation on producing high-quality plug-ins. But packing great sounds into an all-in-one floor unit is a very different design challenge than creating a plug-in. In the form of the Quad Cortex, however, Neural succeeds at creating an intuitive interface and adding interesting features that even seasoned fans of digital setups will find intriguing.
Like a Rock
The Quad Cortex feels solid. Eleven dual-purpose foot switches and an oversized master volume control are situated around a 7-inch full-color touch display. Around back are a wealth of different I/O options including multiple XLR and 1/4" inputs, independent XLR and 1/4" outputs, headphone jack, dedicated Neural Capture output, MIDI, two effects loops, and support for 8-in/8-out USB audio. You'd be hard pressed to find morerouting options on a comparable unit.
Clip 1 goes through various presets that are shipped in the unit.
Clip 2 is a Wampler Hot Wired overdrive feeding a Fender-style amp emulation. The second half of the clip is a Neural Capture of the Hot Wired.
The foot switches not only feel sturdy, but double as rotary knobs that adjust various parameters depending on the function you have selected. For those hesitant to go digital because they miss manual level adjustments, this might be a game changer.
On the Grid
Whether you pull up a preset or start from scratch, the Quad Cortex displays a grid that illustrates almost any signal flow you can imagine. I started simple and loaded up a Fender-style amp impulse response from a Bassman 4x10 with Jensens, and a Myth Drive (Neural's Klon emulation). I monitored through a set of headphones and a powered Electro-Voice EKX 12-" speaker. The warmth and presence in the amp models is easy to hear, and the midrange and low end have a particularly authentic feel. Just to confirm what my ears were hearing, I tried similar patches on an HX Stomp and Kemper Stage. The Quad Cortex easily held its own.
Within about 20 minutes I had a fully functioning stereo setup that sounded great and was easy to tweak.
My next rig was more complicated: Two amps, effects in pre- and post-amp positions, plus an expression pedal. Using Vox-and Hiwatt-style emulations together allowed me to test the unit's wide-ranging "gig" functionality. Here you can use one of three different modes: scenes, presets, or stomps. These functions allow you to assign effects blocks to foot switches (stomp), move between different settings in a single rig (scene), or change rigs entirely (preset). Depending on how you set them up, these three modes offer nearly limitless options. I was able to move between amps, high- and low-dwell reverb settings, and a wacky Whammy-style effect that I operated via an expression pedal (not included). The programming wasn't without a bit of trial and error, but within about 20 minutes I had a fully functioning stereo setup that sounded great and was easy to tweak. With units like these I find that ease of use is nearly as important as sound quality. The Neural excels on this count.
With over 70 effects, Quad Cortex hits all the bases. There are faithful emulations of classic overdrives, compressors, filters, and pitch shifters alongside Neural's proprietary effects. I hope for more modulation effects in future updates, though. Having just one type of chorus, flanger, and phaser underutilizes the Neural's impressive power.
The Neural Cloud system definitely merits mention. It's the most streamlined method for sharing and discovering presets I've encountered. Once you connect your Quad Cortex to wi-fi and download the free mobile app, you can access thousands of user- and artist-sourced presets, captures, and IRs. In minutes I had the exact setup that Rabea Massaad used with Stormzy. Wild! It's a great way to reverse-engineer your own presets, too.
Capture It!
Neural Capture enables you to create a snapshot of an amp or pedal at a specific setting. The function works for amps, cabs, and overdrive pedals. (At press time, Neural mentions that higher-gain drives like fuzz pedals aren't compatible). I hooked up a Wampler Brent Mason Hot Wired following the instructions in the handy on-screen guide. (When capturing a pedal, you don't need to hook it up through an amp and speaker.) The Quad Cortex went through its process and out popped a fresh capture. Neural includes a handy preset template that allows you to A/B the capture and the original pedal. After a few tweaks I was able to mimic the sound without much discernible difference in tone.
Capturing an amp means capturing the properties of the entire signal chain including the speaker and mic. I set up my Revv D20 with an Avatar 1x12 cab and miked it up with a Shure SM57. The capture process is similar to a pedal, except there are more audible artifacts from the analog chain. After a few stops and starts I ended up with a fairly accurate capture of the amp. To my ears, the pedal capture was a bit more accurate. However, you can visit the online version of this review to hear the results for yourself.
The Verdict
The Quad Cortex is an immensely powerful unit. The complete array of features, tones, and expandability via Neural Capture make it a worthy peer to similar units. The grid system is a great way to organize complex routing options. It isn't perfect, and you'll want to consult the manual to optimize the deep functionality. But if you're interested in a more open digital ecosystem and recreating rigs that would occupy a whole rehearsal room in the analog world, the Quad Cortex is a truly impressive way to achieve those aims.
Neural Quad Cortex Demo - First Look
- Fractal Audio Systems AX8 Review - Premier Guitar ›
- Ernie Ball Music Man Dustin Kensrue StingRay Review - Premier ... ›
- Fishman Fluence Greg Koch Gristle-Tone P-90 Review - Premier ... ›
- Neural DSP Announces the Archetype: Petrucci - Premier Guitar ›
- Neural DSP Releases the Tone King Imperial MKII Suite ›
- Neural DSP Releases CorOS 2.0.0 Update for Quad Cortex - Premier Guitar ›
- Neural DSP Technologies Announces Archetype: Tom Morello - Premier Guitar ›
- Neural DSP Technologies Announces Cortex Control - Premier Guitar ›
- Neural DSP Technologies Introduces The Morgan Amps Suite ›
- Neural DSP Nano Cortex Pedal Review - Premier Guitar ›
- New Archetype: Rabea X Plugin by Neural DSP Unveiled - Premier Guitar ›
Guest Picker - Ariel Posen
Q: What was your biggest guitar discovery of 2024?
Guest Picker - Ariel Posen
A: Twenty-twenty-four was a year of discovery and re-discovery for me. I tend to come back to records and artists that I haven't listened to in a long time and get back into them with a new-found excitement. In regards to guitar discovery, at the end of 2023 I got into Paramore for the first time, specifically their last album, This is Why. I don't really listen to guitar music these days, but I'm always infatuated by the extreme detail of finely crafted guitar parts that help serve the song, and that album is full of that stuff. In terms of rediscovery, I spent a lot of time digging back into early George Harrison, Christopher Cross, and some specific Steely Dan records. Seems to be a theme there. I love all that stuff but haven't really given it time in a while; that changed this past year.
Obsession: Doechii. Watch her Tiny Desk video. She's incredible and the band is too. I get goosebumps every time I watch it, and I watch it once a day.
Reader of the Month - Jeremy Jacobs
A: I was turned on to Mk.Gee after seeing his performance on SNL and immediately fell in love with the vibe. I’m always trying to keep an ear to the ground for new, innovative guitar sounds, and his unique approach to creating guitar tones was really refreshing and inspiring. I love the blend of retro ’80s synth sounds and modern digital guitar production.
Obsession: Jim Lill’s video series on YouTube experimenting with guitar tone. He’s like the Mythbusters of the guitar community and it’s really shaking things up! He’s taking a very scientific deep dive into commonly held beliefs about what makes certain equipment “sound good” and has returned some truly shocking results. I’m thinking about guitar gear in a totally different way thanks to his work.
Managing Editor - Jason Shadrick
A: Big delays and reverbs finally got to me in 2024. Typically, I would favor a modest spring or room setting, but a few gigs this year pushed me into more ambient territory. It’s incredible how the sound of space affects your touch on the instrument. My playing has become more melodic and intentional—but I’m still not digging the shimmer vibe.
Obsession: Noel Johnston’s YouTube videos from his Creative Fundamentals class have been warping my brain. Fair warning: They do require a bit of theoretical knowledge to get the most out of them. However, his triad workouts are a great way to start to visualize different shapes all over the neck—no matter what key.
Assistant Editor - Luke Ottenhof
A: Last year, I discovered germanium. This isn’t strictly true; I’ve used germ pedals in the past, but I never connected with the transistors until I picked up the Death by Audio Germanium Filter. Now, all I want is sweet, gnarly, splatty germanium grossness on whatever I play. The problem is it doesn’t really fit with my band’s sound. I predict many arguments in 2025.
Obsession: Figuring out ways to make, share, and celebrate music outside of the too-powerful platforms that have monopolized our arts and culture. Thankfully, there are loads of people way smarter than me working with each other to build new networks and meanings for music, including some that would be musician-owned. The future is bright—if we want it!
Jared Dines had been writing for Canadian metalcore outfit Oni—fronted by Jake Oni—for a few years before Jake invited Dines to join him onstage. Dines had just two days to learn the entire set before rehearsals began. But Eric Palmer can one-up him. He was teching for the band when Jake conscripted him—with just one day to pick up the set before a performance. Palmer rose to the occasion, and he and Dines have formed Oni’s two-guitar tornado for the past year.
Ahead of their gig at Nashville’s Brooklyn Bowl in December, Dines and Palmer walked PG’s Chris Kies through their spartan, one-guitar rigs—no backups, no mercy.
Brought to you by D’Addario.8 is Great
Eric Palmer is used to playing 7-string axes, so this limited-run 8-string Jackson Concept Series MDK8 HT8 MS Modern Dinky didn’t take long to get used to. The Korea-made flamethrower has a basswood body, a 3-piece maple/wenge/mapleneck, and a compound radius ebony fretboard (12" to 16"). It also boasts a dual scale length—25.5" to 27.5"—and is loaded with Fishman Fluence Modern pickups, which feature two voicings selected by a push-pull switch. Palmer had this one upgraded to a 5-way switch to access split-coil sounds, and he got rid of the tone knob. “All gas, no brakes,” as PG’s Perry Bean would say.
Petrucci Power
Jared Dines also needed an 8-string for Oni, so Ernie Ball sent him this Music Man Majesty 8, a John Petrucci signature model. It’s got Fishman’s Powerbridge piezo system, which sees action on the song “Control.” Dines attached his own string clamp behind the nut to halt noise.
Double Quads
Dines and Palmer both rely on Neural DSP Quad Cortexes on this Oni tour. Their units are mounted on Temple Audio pedalboards, and both guitarists use the Architecture: Gojira X patch for their heavy sounds, and a Roland Jazz Chorus sound for cleans. Both Dines and Palmer employ a MIDI switching system that they pulled from Aaron Marshall’s Rig Rundown, and run their signals from direct to front of house.
