The Neural DSP Quad Cortex is a powerful, compact amp modeler that combines high-quality modeling, its own amp capture system and a touchscreen interface. It has quickly become one of the most talked-about units for both home recording and live use. This guide explains what the Quad Cortex does, how it captures amps, and how to record great tones with it.
What is the Neural DSP Quad Cortex?
The Quad Cortex is a floor-based amp and effects modeler from Neural DSP, the same company behind the popular Archetype amp sim plugins. It models amps, cabs and effects, lets you load impulse responses, and can capture real amps using its Neural Capture feature. It also functions as a USB audio interface, so you can record straight into your DAW. If the concept is new, our explainer on what an amp sim is covers the fundamentals that apply here.
Neural Capture: profiling on the Quad Cortex
One of the Quad Cortex’s headline features is Neural Capture, which creates a digital snapshot of a real amp or pedal — similar in concept to the profiling in our Kemper Profiler guide. You connect the amp, run the capture process, and the unit reproduces that specific tone. This sits alongside a library of built-in modeled amps, so you can use the unit fully without capturing anything yourself, then add captures of gear you love.
The touchscreen workflow
The Quad Cortex is built around a touchscreen. You drag and drop amp, cab, drive and effects blocks to build a signal chain, much like working on a tablet. Many players find this faster and more intuitive than menu-diving on knob-driven units. It is one reason the Quad Cortex ranks highly in the best amp modelers.
Cabs, IRs and tone shaping
Like other top modelers, the Quad Cortex supports third-party impulse responses for the cabinet stage. Since the cab and mic carry much of the realism, loading quality IRs is one of the best upgrades you can make. Start with what impulse responses are and browse the best guitar cab IRs. A typical high-gain chain might run a noise gate, a Tube Screamer-style boost, an amp, a cab/IR, then EQ and time-based effects.
The Neural DSP ecosystem
The Quad Cortex connects to Neural DSP’s wider world of software. If you also use their plugins, you will recognise the tonal philosophy and some of the gear. We cover the software side in the best Neural DSP plugins, which is a natural companion if you want the same sounds in a plugin format for mixing.
Recording with the Quad Cortex
The Quad Cortex doubles as an audio interface, making home recording simple:
- Connect it over USB and select it as your audio device in your DAW.
- Set levels with healthy headroom — see gain staging.
- Record the processed tone, and capture a dry DI on a separate channel where possible so you can re-tone later without replaying.
- For wide rhythm guitars, double-track and pan apart using how to double track guitars.
To slot it into a complete setup, see how to set up a home guitar recording rig.
Quad Cortex tips for better tone
- Audition tones in a mix, not just soloed, so they sit with bass and drums.
- Experiment with captures vs modeled amps — sometimes a built-in model nails a sound faster than capturing.
- Swap IRs to fine-tune brightness and body before reaching for EQ.
- Dial methodically using our guide to dialling in amp sim tones.
Frequently asked questions
How is the Quad Cortex different from a Kemper?
Both can capture real amps. The Quad Cortex pairs capture with a large library of modeled amps and a touchscreen workflow, while the Kemper built its reputation primarily on profiling and its huge profile library. They are different routes to a similar goal.
Can the Quad Cortex be used as an audio interface?
Yes. It connects over USB and lets you record directly into your DAW, often capturing both the processed tone and a dry DI for re-amping later.
Do I need to capture amps to use the Quad Cortex?
No. It comes with modeled amps, cabs and effects you can use straight away. Neural Capture is an extra feature for snapshotting gear you own, not a requirement for getting good tones.
