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
Now, take a look inside his studio and eyeball an impressive armada of guitars, amps, and effects with PG's John Bohlinger.
[Brought to you by D'Addario XPND Pedalboard: https://www.daddario.com/XPNDRR]
Guitars
(Ronquillo has a lot of 6-strings, but we narrowed down this Rundown to a few favorites that do most of the heavy lifting.)
Pretty in Pink
This Nash S-81 features an EMG SL20 Pro Series Steve Lukather signature set of pickups, and it's strung with a D'Addario NYXL .010–.046 set.
Original Senn
This is one of Nashville builder Jeff Senn's Fullerton S-styles, with Lollar pickups, a Vega-Trem tremolo, and a set of D'Addario NYXL .010–.046s.
In for the Pun
Yes, Senn thinks this is funny, too.
Bet on the Knaggs
Here's a Doug Rappaport signature Knaggs Kenai DR, featuring a Seymour Duncan Slash neck pickup and a Duncan Custom Shop '78 in the bridge. Ronquillo added a String Butler tuning stabilizer. Once again: D'Addario NYXLs, .010–.046.
Photo Finish
This Novo Custom Serus J features a one-of-a-kind "Ron-Tealio" finish with Brandonwound P-90s. Same D'Addario NYXLs. Cool speed dials and whammy bar tip, yes?
S-Style with a Twist
And now for something completely different, here's an RS Guitarworks Twisted. The guitar has an alder body and a rosewood neck, with Fralin Woodstock pickups. RJ uses a Stringjoy Hendrix set: .010, .013, .015, .026, .032, and .038. The lighter G string supposedly provides a more balanced tone.
Make Way for Junior
Here's another axe with history in its genes: a Grez Mendocino Junior. In classic Junior form, it has a 1-piece body, but it is made from reclaimed old-growth redwood. The neck is solid Honduran mahogany with a Macassar ebony fretboard. The pickup is a dog ear Wolftone MeanerP90. This one sports RJ's usual D'Addario NYXLs.
A Barney—Not the Purple One
This cherry sunburst 1964 Gibson Barney Kessel Custom is all stock, replete with bow-tie inlays and elegant binding. For a bit more beef, it's strung with Thomastik-Infeld George Benson strings: .012, .016, .020w, .028, .039, and .053. Note the cool badge at the bottom of the tailpiece.
Amps—Loud City
RJ has a lot of amps, so we narrowed it down to those in "Tonehenge," the part of his studio that houses his amplifiers that are in current heavy rotation.
Morgan Horsepower
Want classic American amp tone? Here's your pony. This 35W head uses two 5881 power tubes, two 12AV7s, and a GZ34 rectifier.
Yes, Suhr
This Pete Thorn signature has three channels, an effects loop, four EL-34 power tubes, six 12AX7 preamp tubes, and is set up for MIDI control.
Sibling Revelry
This Friedman Twin Sister uses 40 watts to go for classic British tone. It's inspired by the Marshall JTM 45. Each channel has a bright switch and a 3-position gain switch, and there are two 5881s and five 12AX7s lurking inside.
Sultan of String
With a nod to Howard Dumble, here's Amplified Nation's Steel String Sultan—a 25 watt version of this custom build. As you'd expect, the Boston-area company has packed it chock full of top-of-the-line components, including orange drop and NTE caps, and Classic Tone and Heyboer transformers.
White Box of Rock
Helping Ronquillo have even more options when it comes to recording and routing, he employs this Two Notes Torpedo Captor X Stereo Reactive Load Box.
The Chains We Forge in Tone
RJ is a pedal guy. His rig flows through a series of boards, but the signal from his guitar firsts lands here, at a JAM Pedals Wahcko wah and a Sabbadius Funky-Vibe Fillmore East edition.
Like a Peach
From there, the signal hits his "Fuzz Board," which includes a One Control Iguana Tail Loop 2 switcher feeding a King Tone MiniFuzz germanium, a Wes Jeans Texas Fuzz silicon fuzz face clone, an Expresso FX Fuzz Bender Mk 1, a Wren and Cuff Small Foot Box of War muff-style, a J.Rockett .45 Caliber overdrive, and an MXR CAE buffer.
Switch It Up
Since there are three more pedalboards in RJ's setup, this Boss ES-5 Switcher is sensible
The Main Vein
A lot goes down here. When that Boss switcher sends the guitar signal this way, it encounters a Peterson StroboStomp HD tuner, a DigiTech Drop, a DryBell Unit 67 EQ/boost/comp, a King Tone Octaland mini octave pedal, an AnalogMan Sun Face, a Pogo Pedals Zen Ray overdrive, a Nobels ODR-1, his signature Mythos Susmaryosep! boost/overdrive/echo, an LPD Eighty 7 distortion, a Vertex Boost, a Roland EV-5 expression pedal, a GFI Synesthesia multi-modulator, JAM's Harmonius Monk tremolo, and a Boss FRV-1 '63 Fender Reverb.
Enter to win pedals from RJ's main board seen above!
Next!
Currently to the right of the main board, these: a Voodoo Lab Micro Vibe, Fulltone's Ultimate Octave, a King Tone Duellist dual overdrive, MXR's FET Driver, and a LPD Seventy4 overdrive.
But Wait, There's More
You ain't seen nuthin' yet. Okay, you've seen a lot. But there's also, to the left of the main board: a Mythos High Road mini fuzz, a Beetronics Vezzpa Octave Stinger Fuzz, a Cornerstone Gladio dual overdrive. a Vertex Ultra Phonix Overdrive, and a Vertex Ultra Phonix HRM overdrive. He uses Truetone, Cioks, and T-Rex power supplies.
And Even More!!
Another board is home to four filthy boxes—a Metropoulos Supa Boost, Hudson Electronics Broadcast-AP preamp (Ariel Posen signature), Lovepedal Tchula Boost, and an Analogman Beano Boost.
