This heavyweight digital solution packs a mighty punch. How does it stand up to the competition?
Excellent amp models. Neural Captures are really cool. Smartly designed footswitch knobs. Excellent mobile app.
Unable to run Neural's native plug-ins at press time. Some lackluster effects.
$1,849
Neural DSP Quad Cortex
neuraldsp.com
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
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Roger Waters is set to release a Super Deluxe Boxset of The Dark Side Of The Moon Redux on March 14, 2025. The Boxset includes a live album from his sold-out London Palladium shows, gold vinyl, CD, Blu-ray, and a track-by-track video interview.
The Super Deluxe Boxset includes:
- The Dark Side Of The Moon Redux on gold vinyl (2LP), CD, Blu-ray: Dolby Atmos Mix, 96/24 Audio.
- The Dark Side Of The Moon Redux Live on gold vinyl, CD, Blu-Ray, 96/24 Audio
- Roger Waters Track by Track video interview on Blu-ray
- Four 4 x 10-inch Vinyl from the original Redux album cut at 45 RPM for: Money, Time, Speak To Me/Breathe and Us & Them, each with an artwork etched B-side.
- A 40 page Commemorative Book of Photographs from The Making of the Album, Rehearsals, and Roger Waters Redux Live at The London Palladium.
- Initial Boxset orders from the official store include a signed print by Roger Waters
Waters Quote:
āAll that is gone, all thatās to come? Looking back or looking forward, Dark Side of the Moon offers you choice. The choice is yours. Darkness or the Lightā.
Track listing:
The Dark Side Of The Moon Redux studio album and Roger Waters Live album:
āSpeak to Meā
āBreatheā
āOn the Runā
āTimeā
āGreat Gig in the Skyā
āMoneyā
āUs and Themā
āAny Colour You Likeā
āBrain Damageā
āEclipseā
The Dark Side Of The Moon Super Deluxe box set Redux credits include: Roger Waters: Vocals / Gus Seyffert: Bass, Synth, Backing Vocals / Joey Waronker: Drums, Percussion / Jonathan Wilson: Guitars, Synth / Johnny Shepherd: Organ, Vocals / Via Mardot: Theremin, Vocals / Azniv Korkejian: Vocals, Percussion / Jon Carin: Keyboards, Lap Steel, Synths, Organ, Vocals / Robert Walter: Piano, Harpsichord, Synths / Strings: Gabe Noel: String Arrangements: Gabe Noel
Recorded live at The London Palladium // Produced by Gus Seyffert and Roger Waters // Mixed by Sean Sullivan, Darrell Thorpe, Roger Waters and Gus Seyffert // Mastered by Dave Cooley, Elysian Masters // Art Direction and Design: Sean Evans // Photography: Kate Izor.
For more information, please visit rogerwaters.tmstor.es.
Roger Waters - THE DARK SIDE OF THE MOON REDUX SUPER DELUXE BOXSET - YouTube
Guest Picker - Ariel Posen
The past year was full of new sounds and discoveries. Ariel Posen and Jeremy Jacobs join the PGteam to highlight what popped out to them over the last 12 months.
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. Iām 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 ā80s synth sounds and modern digital guitar production.
Obsession: Jim Lillās video series on YouTube experimenting with guitar tone. Heās like the Mythbusters of the guitar community and itās really shaking things up! Heās taking a very scientific deep dive into commonly held beliefs about what makes certain equipment āsound goodā and has returned some truly shocking results. Iām 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. Itās incredible how the sound of space affects your touch on the instrument. My playing has become more melodic and intentionalābut Iām still not digging the shimmer vibe.
Obsession: Noel Johnstonās 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 neckāno matter what key.
Assistant Editor - Luke Ottenhof
A: Last year, I discovered germanium. This isnāt strictly true; Iāve 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 doesnāt really fit with my bandās 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 brightāif we want it!
Oniās guitar duo cover 16 strings between them with a pair of Neural Quad Cortexes and some choice patches.
Jared Dines had been writing for Canadian metalcore outfit Oniāfronted by Jake Oniāfor 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 himāwith just one day to pick up the set before a performance. Palmer rose to the occasion, and he and Dines have formed Oniās two-guitar tornado for the past year.
Ahead of their gig at Nashvilleās Brooklyn Bowl in December, Dines and Palmer walked PGās Chris Kies through their spartan, one-guitar rigsāno backups, no mercy.
Brought to you by DāAddario.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 didnāt 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 lengthā25.5" to 27.5"āand 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. āAll gas, no brakes,ā as PGās 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. Itās got Fishmanās Powerbridge piezo system, which sees action on the song āControl.ā 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 Marshallās Rig Rundown, and run their signals from direct to front of house.
The author found this one-of-a-kind tremolo/vibrato/sound-altering modulation box at Quattro Music Company in Thomas, West Virginia.
Producer and roots-guitar veteran Michael Dinallo pens his unabashed love letter to tremolo, with fond recollections of vintage Fender and Gibson amps, Dunlopās TS-1, and a one-of-a-kind mystery modulator.
Tremolo is my favorite effect to modulate a guitarās sound (and I love vibrato, too). I love it so much that itās part of the moniker of the production team I had with the late Ducky Carlisleāthe Tremolo Twinsāas well as our Trem-Tone Records label. You might recognize Ducky from his many engineering credits, including Buddy Guy, or our work together on albums like Stax veteran Eddie Floydās heralded Eddie Loves You So, from 2008.
For me, the golden period of tremolo was the early 1960s. The brown-panel Fender amps of that period have astounding harmonic tremolo, as do the Gibson amps from that period. I have a 1963 Gibson GA-5T Skylark that has a tremendous tremolo circuit. I used that amp for all the guitar parts I cut on my new album, The Nightās Last Dance,as well as all the records Iāve worked on over the last four years, either as producer or player. My favorite, though, is the 1963 2x10 Fender Superāalso a brown-panel amp. It can be so soupy that, if multi-tracked, it can almost induce seasickness.
But there are so many choices and classic sounds. The Magnatone and Lonnie Mack jump to mind, or the use of a Leslie cabinet for guitar, which is another sound I love as both player and producer. Two of the most distinct and famous uses of tremolo, to my ears, are Link Wrayās āRumbleā and Reggie Youngās arpeggiating opening chord on āThe Dark End of the Streetā by James Carr. There is a shimmery quality to big chords drenched in a slow tremolo, especially if the part is doubled. From a production standpoint, it adds depth to a track, even if itās mixed way in the back.
Letās talk about doubling a tremolo part. Once in a while you can get lucky and have the amp cycle the wave at just the right time as you hit the record button. But most often not. Usually this is not a big deal and adds to the depth of the bed part being recorded. Sometimes, though, it has to be a tight double. Thatās when Iāve spent much time guessing at the cycling and trying to hit it just right. Itās a blast when you do.
One of my favorite experiments with tremolo was setting up two ampsāa brown-panel Fender Vibroverb and a brown-panel Fender Concertāin a V-shape. The amps were set to the same volume and approximately the same tone settings. Using a stereo mic in the middle of the V, we recorded it to one track. We had to keep tweaking the individual tremolo settings in an effort to not have them cancel each other out. But what a huge, lush sound!
āThere is a shimmery quality to big chords drenched in slow tremolo, especially if the part is doubled.ā
There are many tremolo pedals and recording plugins these days, and theyāre all good, but nothing quite captures the sound of an internal tremolo circuit. You can avoid chasing their cycles, too, if a pedal has a tap-tempo function. But what fun is that?
The one tremolo pedal, for me, that comes the closest to an in-amp circuit is the now-vintage Dunlop TS-1. Thirty years ago, I needed a tremolo pedal for my road ampāat the time, a 1994 Fender tweed Blues DeVille. I found Dunlopās big, honking purple metal box with ātremoloā written across the front in wavy yellow letters. You can get wide, sweeping tremolo or set it to a hard, choppy setting where the volume completely disappears. Iāve used both applications effectively. The hard trem is great for the last chord of a song, especially live, hitting like a boxer sparring with a weighted, hanging bagāespecially if youāre diving into a psychedelic ending. And, of course, mixing in other modulation effects, such as flanging or phasing, adds another twist.
I found the most unique tremolo/vibrato/sound-altering modulation box I have at Quattro Music Company in Thomas, West Virginia. Itās not a pedal per se; itās circuitry housed in a cigar box with so many knobs and switches and variations that I still have not exhausted all the possibilities. Itās a one-off. I was told it was the only tremolo box the inventor made. Combining it with a front-end boost and diming an amp produces otherworldly sounds. Iāve used it on a couple of recordings: āNever, No More (A Reckoning)ā by Keith Sykes and me, and āTime Machineā by the Dinallos (where we were joined by Nashvilleās famed singing siblings, the McCrary Sisters). With the latter, itās most obvious as a tremolo device, and on the former itās as a sound-altering gizmo that enhances the guitar leads.
Of all the toys in the arsenal that guitarists have, Iāve gotta say, long live tremolo!