Connect via USB MIDI to your Valeton GP-200. Load, edit, and send presets live to the device.
Edit Preset
?Load preset from disk
.prst / .hlx
A free GP-200 editor that runs in your browser
Preset Forge is a free, unofficial editor for the Valeton GP-200 multi-effects pedal. It runs entirely in the browser: there is nothing to download or install, and it works the same on Windows, macOS, Linux and ChromeOS. Open a .prst preset, change any effect or parameter and save it again — or connect the GP-200 by USB and hear every change on the pedal as you make it.
What the GP-200 editor does
Every GP-200 preset is a chain of eleven blocks: PRE, WAH, DST, AMP, NR, CAB, EQ, MOD, DLY, RVB, VOL. On the pedal you edit them one at a time on a small screen. In the editor you see the whole signal chain at once, as a pedalboard or as a list. Click a block to pick one of 305 effect models — amps, cabs, drives, modulation, delays, reverbs and more — and set its parameters with knobs, sliders and switches. The effect names and parameter ranges come from Valeton’s own effect list, so the values you set here are the values the pedal uses.
Features
- Load and save .prst files: drag a preset onto the page or pick it from disk, and download your edit as a .prst file again.
- Edit all eleven blocks: switch effects on and off, change the effect type and adjust up to fifteen parameters per block.
- Reorder the signal chain by drag and drop, or with the arrow keys on a focused block header.
- Set the FX loop send and return positions, patch volume, pan and tempo.
- Assign up to three effect parameters each to EXP 1 (modes A and B) and EXP 2, each with its own min/max range.
- Import Line6 HX Stomp .hlx presets and convert them to GP-200 format (experimental).
- With a free account, save presets online, publish them to the community gallery and build playlists for rehearsals and gigs.
Live editing over USB MIDI
Connect the GP-200 with a USB cable and click “Connect GP-200”. In Chrome, Edge and other Chromium-based browsers, and in Firefox 108+ on the desktop, the editor talks to the pedal through Web MIDI: switching an effect, turning a knob or reordering the chain is sent to the device instantly. “Load” pulls a whole bank of four presets from the pedal, “Save to [Slot]” writes your preset back, and a .prst file you open while the pedal is connected is sent to it block by block as a live preview. Safari and browsers on iPhone/iPad have no Web MIDI; there you can still edit and save files.
Works with your .prst files
The GP-200 stores each preset as a small binary .prst file — 1224 bytes for a user preset. Preset Forge reads and writes this format directly: the preset name and author, all eleven effect blocks with their parameters, and the checksum the pedal verifies. Factory presets open too. Because it is the same file format, you can move between Preset Forge, the official Valeton software and presets you download from other players at any time.
Windows, Mac, Linux — nothing to install
Valeton’s own GP-200 editor is a Windows desktop application. Preset Forge only needs a browser, so it also runs on a Mac, on Linux distributions such as Ubuntu, Fedora or Mint, and on Chromebooks. After the first visit the editor works offline as a progressive web app (PWA) — handy in a rehearsal room without Wi-Fi.
Free and open source
Editing is free and needs no account; an account is only needed to save presets online and share them. The source code is published under the GPL-3.0 licence. Preset Forge is an independent project and is not affiliated with or endorsed by Valeton.