The Best Amp Modeler and Audio Interface: Neural DSP Quad Cortex
If you take money out of the equation, the Neural DSP Quad Cortex is the amp modeler to beat. It's the unit pros use on records and arena stages, and it doubles as one of the best-sounding audio interfaces you can put on a desk. This is the no-compromises pick.
Why the Quad Cortex
The horsepower is the headline. It runs on a quad-core SHARC+ DSP platform, which is what lets it model amps and effects with a realism most units can't touch. Out of the box you get more than 90 amp models, over a thousand impulse responses, and more than 100 effects, all driven from a 7-inch color touchscreen and eleven footswitches.
The feature that sets it apart is Neural Capture. Using an AI model, it can learn the sound of a real amplifier, overdrive, or cabinet and recreate it, no computer required. You can capture your own tube amp and carry it to a gig in a four-pound box. On top of all that, it works as a Class 2.0 8-in / 8-out USB audio interface, so it plugs straight into your computer for recording with no extra hardware.
Who it's for, and who it isn't
This is gear for gigging and recording players who want the best and will use it. If you tour, track records, or run in-ears and want one box that does everything, it earns its price. If you're a few months into playing, it is far more than you need, and the money is better spent on lessons and practice time. Start with the $18 JOYO interface or the value-packed Donner Arena 2000, and step up to a Quad Cortex when you've outgrown them. There's no shame in buying it later.
Plug it into Guitar Quest
The Quad Cortex is also your interface, so it slots straight into Guitar Quest. Connect it over USB and play through your captured tone while the app detects every note you hit. Guitar Quest is tuned to play nicely with a range of interfaces and modelers, the Quad Cortex included, along with the JOYO, a Focusrite Scarlett, a MOTU, and the Donner. Same fretboard training, running through the best rig in the room:
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