What is Neural Amp Modeler (NAM)? A plain-English guide

Somewhere right now a kid with a $120 practice guitar is playing through a $10,000 amp he'll never touch, in a room he'll never stand in, and it costs him nothing. He downloaded a file. He dropped it into a free plugin. That's the whole transaction.

The file is a NAM profile. The plugin is Neural Amp Modeler. There's a neural net doing the work, but the reason a working guitarist should care is simpler than the AI: it's the shelf. Thousands of amps and pedals, captured by real people, given away for free.

This is a guide to how that works, why it caught fire, and the one honest thing a capture can't do.

What Neural Amp Modeler actually is

Neural Amp Modeler (NAM) is free, open-source software that captures the sound of a real guitar amp and plays it back. It was created by Steven Atkinson, who started it as a side project while he was getting deeper into machine learning, and put the code on GitHub under the MIT license. Neural Amp Modeler runs as a VST3 or AU plugin on Windows and macOS, runs standalone if you don't want a DAW open, and has a community-maintained LV2 build for Linux. The captures it plays are made and given away by other guitarists, mostly through a community library called TONE3000. All of it costs nothing.

It took a while to catch. He first put it on GitHub in 2019 as an experiment, left it alone for a few years, then picked it back up in early 2022 and built the first plugin anyone could actually use. After that it moved fast: NAM's official Facebook group went from a couple hundred members at the start of 2023 to more than 15,000 by the end of it.

MIT is about as permissive as software licenses get: anyone can use the code, build on it, ship it inside their own product. That one decision is why NAM ended up running on pedals and multi-effects units built by companies Atkinson has never met.

How a capture gets made

You take a real amp. You feed a known test signal through it: a specific, agreed-upon stream of sound. You record exactly what comes back out the other side. Now you have two recordings, the "before" and the "after," and the difference between them is everything the amp did to the sound.

A small neural network studies that difference until it can fake it. Feed the trained net a dry guitar signal and it produces what the amp would have produced. When it's good enough, you export the result as a .nam file, small enough to email.

That file is the capture. It's a recording of one amp doing its thing, frozen into a shape you can share. Which is the exact detail that matters later, so hold onto it.

What changed with NAM A2

If NAM has been all over your feed lately, this is why.

On June 2, 2026, the project released A2, short for Architecture 2: a ground-up redesign of the neural network that captures are built on, developed by Atkinson together with TONE3000. It landed across the whole stack at once, in the trainer that makes captures, the inference core that plays them, and the official plugin.

What A2 buys you, according to the project's own write-ups: better dynamics and transient behavior, fewer digital artifacts, and a longer window of audio the model gets to look at, which lets it handle gear the old architecture struggled with (compressors, for one). That testing was run by the people who built it rather than an outside lab, so weigh it the way you'd weigh any manufacturer's numbers. A2 also brought "slimmable" captures, where one downloaded file can run in a lighter mode on a slow machine or a fuller one on a fast machine.

The question most people actually have is whether their existing captures still work. They do. Atkinson said so before the release and it held: old .nam files load and play in the current plugin, and DAW projects built on them keep working exactly as they did. Nothing on the shelf got thrown away.

The version floor runs the other direction. A2 captures need software built on the newer inference core, which the official plugin already ships. Third-party hardware and software have to update to it on their own schedule, so a pedal you bought last year may play the old captures happily and need a firmware update before it touches an A2 one.

Old captures keep playing everywhere. New ones spread as fast as everybody else ships an update.

Why it exploded: the tone commons

The technology is genuinely impressive. What actually made NAM win happened off to the side of the tech, out in the community.

NAM won because of the tone commons: a free, community-owned library of captures that anyone can add to and anyone can pull from. The main hub is TONE3000, which took its current shape in March 2025 when ToneHunt merged with another library site. Thousands of profiles sit there: vintage cleans, boutique combos, high-gain monsters, bass rigs, single pedals, whole signal chains. People capture their prized gear and just give it away.

Think about what that replaces. The old way to hear a legendary amp was to buy it, or buy a pricey modeler with that amp baked in by a company. The tone commons routes around both. One person owns the amp, captures it once, and ten thousand people play it for free forever.

No company curates that shelf. No release schedule gates it. It grows because guitarists like showing off their gear, which turns out to be a bottomless renewable resource.

How to start playing NAM captures

A .nam file does nothing on its own. You need something to load it into, and the software path takes about ten minutes:

1. Get the plugin. Free from the Neural Amp Modeler site, as a VST3, an AU, or a standalone app. Windows 10 (64-bit) and later and macOS 10.15 and later have official builds; on Linux you want the community LV2 project.
2. Get a capture. TONE3000 is the big library and it's free to download. Grab a few in whatever style you're chasing, since captures of the same amp vary a lot depending on who made it and how.
3. Load it, and add a cab. Drop the .nam file into the plugin, then load a cabinet impulse response for the speaker part. The plugin has an IR loader built in. Some captures are full-rig and include the cab already, which is simpler and less flexible.
4. Play. That's it. There's no account, no activation, no license to manage.

Total cost: $0, assuming you already own an interface. If you want to see what else free software can do now, I ranked the best free amp sims, including the ones that compete with the thing I'm building.

Hardware. This is newer and moving fast. A German outfit called Dimehead makes a dedicated pedal, the NAM Player, that loads .nam files directly, and Darkglass does the same in the Anagram. Beyond the native ones, several multi-effects units get you there by converting the file to their own format first, including the Valeton GP series and Hotone's Ampero II, each through its own desktop tool. If you gig and you've been weighing a floor unit against a laptop on stage, that's its own rabbit hole, and I wrote about the tradeoffs in software vs hardware amp modelers.

NAM vs ToneX vs Kemper

These three get compared constantly, and the comparison holds up, because all three capture a real piece of gear and play it back. Same family. Kemper got there first, back in 2011, by a different technical route than the neural-net approach NAM and ToneX use.

The differences that matter are about the ecosystem around each one.

I've recorded whole albums through a Kemper using captures I bought, and it's a really good way to work. A paid product with a company behind it can offer things a volunteer project can't promise, like a support line and a roadmap.

Pick a fight between them and you'll get 40 forum pages. The useful summary: NAM's edge is free, open, and the size of that shelf. The paid tools compete on everything else.

The one honest limit

Every capture shares one trait, and it's the deal you strike when you use one. Worth understanding before you're surprised by it.

A NAM capture is a recording of one amp at one set of knob positions. Whoever made it set the gain, the bass, the mids, the treble, played the test signal, and froze that exact moment. What you downloaded is that moment.

So when you grab the tone knob inside a NAM player, you're moving a generic EQ the software puts downstream of the capture, not the amp's own control. It'll get brighter or darker, but it moves the sound the way a stereo's tone control does, not the way the amp's own circuit would have if you'd actually reached over and turned it.

That's the one-accurate-setting ceiling. It belongs to the capture approach itself rather than to NAM. ToneX has it. Kemper has it. Any tool built on capturing a frozen moment has it, by definition. I pulled it apart properly in why your capture only sounds right at one knob setting, and what an amp sim actually is sorts out the whole category. Modeled amps (a Helix, a Fractal box, most of the good free plugins) don't have this ceiling at all: their knobs interact because the tone stack is written into the code. They trade it for a different limit, the catalog ceiling: you get the amps somebody chose to build.

And for a huge amount of real work, the ceiling does not matter at all. If you found a capture that nails the exact tone you want, it's perfect, it's free, and it'll sound identical every single time you load it. That's a genuinely great trade. A frozen photograph of the perfect tone is worth a lot, and NAM hands you thousands of them for nothing.

The ceiling only starts to pinch when you want to reach over and turn the knobs and hear the amp actually respond, the way it does in the room.

Where Cathode fits

I build Cathode, so this last bit is certainly biased.

Cathode plays amps as live circuits. The circuit runs in real time at whatever knob positions you dial, so when you turn the gain, the whole amp re-responds. The knobs are the amp's own.

The other half is the part I care about more. A Cathode amp is a design rather than a finished product: an open file you can read, change, and build from. Move the tone stack. Swap a tube type. Add a stage that has never existed in a real chassis, because nothing says a circuit has to be one you could physically build. The shelf works the way the tone commons does, except what people share is a circuit you can open instead of a recording you can only play. So the amp you want doesn't have to be an amp that already exists, and the community can author gear nobody has built or could build. The limits are imagination and CPU.

Cathode exports NAM profiles today, so anything you dial in can be frozen into a .nam file and carried straight into the tools and pedals you already use. The other direction, where Player and Designer open any NAM capture so you can bring your whole library across, is planned rather than landed; it sits on the status board under that label. Interop over walls.

Cathode Player is free. If you want to turn a knob and hear the amp argue back, that's what it's for.

And if the tone commons already gives you everything you need, honestly, good. That's thousands of amps for the price of a download, built by people who just wanted to share. Not much in this hobby is that generous.

Quick answers

Is Neural Amp Modeler really free? Yes. The plugin, the training code, and the source are free and open source under the MIT license, and captures on TONE3000 are free to download. There is no paid version of NAM.

Does NAM work in a DAW? Yes. Neural Amp Modeler installs as a VST3 and an AU plugin, so it loads in Logic, Reaper, Ableton, Cubase, and anything else that hosts those formats. It also runs standalone if you'd rather not open a DAW just to practice.

Does NAM run on Mac, Windows, and Linux? Windows 10 (64-bit) and later and macOS 10.15 and later get official builds from the project. Linux is covered by a community-maintained LV2 plugin, which is a separate effort rather than an official release.

Do I need a powerful computer? Probably not. NAM models come in several sizes, and the lighter ones are built for weaker hardware; A2 added a format where a single file can run light or full depending on the machine. It's also light enough to run on small dedicated pedals with no laptop involved, which tells you most of what you need to know.

What is a .nam file? A .nam file is one capture: a single amp, at one set of knob positions, trained into a small neural network and saved out. It's small enough to email, and it does nothing by itself. You need the NAM plugin or a NAM-compatible device to play it.

Where do NAM captures come from? Other guitarists, mostly. Someone points the free trainer at an amp they own, runs the capture, and uploads the result to a community library like TONE3000, where anybody can download it for nothing. You can also capture your own gear if you've got an amp worth freezing.

Do I still need a cab impulse response? Usually yes. Most captures are amp-only, so you pair one with a cabinet IR, and the NAM plugin has an IR loader built in for exactly that. Full-rig captures are the exception, with the cab already baked in.