NAM FORGE · Zoom MultiStomp ZDL Workbench

Turn NAM (Neural Amp Modeler) captures into Zoom MultiStomp .ZDL effects for the MS-50G / MS-60B / MS-70CDR, and design 128×64 1-bit covers. The UI palette is inspired by the Zoom G1on.

Runs entirely in the browser. Files never leave your machine.

Batch conversion Cover designer Image import

The app UI is Chinese-first. This README is in English.

Compatibility

Zoom MultiStomp MS-50G / MS-60B / MS-70CDR (original models; not the “+” series or the Four series).
Zoom G1on: visual/hardware reference only (amber LCD, blue knobs, gray-black panel). The G1on itself is not a target device for these ZDLs.
NAM / Neural Amp Modeler: A2 Lite captures (.nam, SlimmableContainer, 3-channel WaveNet).
Output: .ZDL effects for Zoom Effect Manager 2.3.3+.

Shared covers

Browse community covers in NAM FORGE COVERS. Download a design JSON from the library, then use 封面设计 → 导入设计 in the app.

Share from the app: in the cover editor, click 分享到共享库, fill in name/author/license/source and click 分享. The app packs the design into a prefilled GitHub issue; click Submit new issue once. No token and no exports. A GitHub Action validates it and adds the design JSON + 128×64 PNG to library.json automatically.

Features

Batch conversion — drop multiple .nam files; the app detects A2 Lite models (3-channel WaveNet inside a SlimmableContainer), assigns short names and slots, and exports a ZIP with .ZDL + matching .png + .json notes.
Cover library — save multiple edited covers from the Cover designer (stored in this browser's localStorage). In the Batch and Re-cover tables, click a row's cover thumbnail to pick a cover just for that file (library, built-in preset, or the current edit); one button resets everything to the default cover.
Re-cover — drop existing .ZDL files; only the 1,024 B picture area and 12 B display name are rewritten. Weights, FXID and version are left untouched (byte-diff verified). Each file can use its own cover.
Cover designer — 128×64 1-bit; default “plain text on light” with 1 px small text; presets, freehand drawing, invert, clear. The “original pedal” preset draws no name by default; enable “show name” if you want it.
Image import — half-solid / half-dither hybrid (default, dot amount adjustable), pure dither, solid, or line/edge mode; scale 25–400%, X/Y offset, or drag with the Move tool. Artwork is fitted to the pedal's display shape (LCD pixels are 1.4× taller than wide), so it is not stretched on the ZDL.
What you see is what you get — editor, pedal previews, thumbnails and the exported PNG all use the pedal's real 1.4× shape.
Text — show/hide, small 1 px or large, X/Y offset or drag with the Move-text tool; optional plate and outline.
Import / export — export the cover as a 128×64 PNG; export/import the full design as JSON (bitmap + text position/size/toggles), so you can continue on another machine.
Engine 0.26, 216 capture slots, 194 DSP per full-rate capture.

Quick start

Download or clone this repo and open index.html in Chrome or Edge.
No server, no network: files are processed locally in the browser.
Or use the GitHub Pages build: https://zisonzishen0415-stack.github.io/nam-forge/

Convert

Batch → drop multiple .nam files.
Start slot defaults to 40 and can be changed per row (any value 1–216).
Convert all → Download ZIP.
Each capture gets NAM<slot><shortname>.ZDL, a matching .png (Effect Manager thumbnail), and NAMLite-<shortname>.json (conversion notes).

Re-cover

Re-cover → drop existing .ZDL files (0.26 templates).
Edit the display name; click a row's cover thumbnail to pick a cover for that file, then Apply cover.
Only the cover area and display name change; the amp model data is untouched.

Install on the pedal

Use Zoom Effect Manager 2.3.3+ → Settings → Read Effects from folder → From Folder, pointing at the extracted folder.
The .ZDL and matching .png must sit together; do not rename them (the pedal only keeps the first 8 characters of the basename, and duplicate names can freeze it).
Original MultiStomp only: MS-50G / MS-60B / MS-70CDR. The “+” models (MS-50G+, MS-60B+, MS-70CDR+) and the Four series are not supported.
Back up your patches first. A full-rate capture declares 194 DSP; several captures usually cannot run at once.
If the pedal freezes: unplug it, hold Up + Down while plugging in USB to enter update mode, then delete the last installed effect with Effect Manager. As a last resort, All INITIALIZE erases all patches.

Technical notes

Cover: 128×64, 1-bit, Zoom column-major RLE, 1,024 B capacity.
Names: 3×5 pixel font; only A–Z, 0–9 and - + / . !; filenames NAM<slot><name> are at most 8 characters.
Engine 0.26: full rate 194 DSP; 48 kHz sources run on the pedal's 44.1 kHz rate without sample-rate conversion.
All conversion happens locally in the browser; there is no server and no upload.

References & credits

Palette / hardware reference: Zoom G1on — amber LCD, blue knobs, gray-black panel. Zoom and G1on are trademarks of Zoom Corporation; this project is not affiliated with or endorsed by Zoom.
Engine and ZDL/cover format: themanro/ZoomMultistompZDL — NAMLite 0.26, templates, slot identity and cover encoding. The fork's original work is MIT; see its notes for the upstream repeat98/ZoomMultistompZDL.
NAM format: NeuralAmpModelerCore (Steven Atkinson, MIT).
Font: JetBrains Mono (SIL Open Font License 1.1), embedded in the page; see FONT-LICENSE.txt.
Installer: Zoom Effect Manager (third-party; not bundled).

Third-party notices and the full MIT/OFL texts are in NOTICE.txt and FONT-LICENSE.txt.

Keywords: Zoom MultiStomp, Zoom G1on, MS-50G (MS50G), MS-60B (MS60B), MS-70CDR (MS70CDR), NAM, Neural Amp Modeler, NAM capture, NAMLite, .nam, .ZDL, ZDL, Zoom Effect Manager, amp modeling, guitar, bass, multi-effects, effect pedal.

Disclaimer

This is not an official Zoom Corporation product and is not endorsed or supported by Zoom.
Custom effect files can freeze or prevent the pedal from booting; back up your patches and use at your own risk.
Engine templates and formats come from the open-source projects above. NAM captures are supplied by the user; no captures are bundled.