Help

Getting Started

Load a .prst file by dragging it into the editor or clicking "Load preset from disk".
Click on an effect slot to adjust parameters. Toggle effects on or off with the LED button. Switch between pedal view and list view.
Click "Save preset as file" to download your edited preset as a .prst file.
Drag and drop effect slots to reorder the signal chain — or focus a slot header and press Arrow Up / Arrow Down to move it.
Each .prst file contains an author name (max 16 characters). You can view and edit it in the editor.

HX Stomp Import (Experimental)

Load a .hlx file from a Line6 HX Stomp. The app automatically converts it to GP-200 format.
This feature is experimental. Not all HX Stomp effects have a GP-200 equivalent — unmapped effects are skipped or approximated.
Converted presets include effect types, parameters, and signal chain order. Review the result in the editor before saving.

USB MIDI Connection

Web MIDI works in Chrome, Edge and other Chromium-based desktop browsers, and in Firefox 108+ on desktop. On first use, Firefox asks you to install a one-time site-permission add-on and then asks for MIDI access. Safari and mobile browsers (including Firefox for Android and all iOS browsers) do not support Web MIDI. Chrome, Chromium and Firefox all run on Linux (e.g. Linux Mint) — Preset Forge is the only GP-200 editor with Linux support.
Connect your GP-200 via USB and click "Connect GP-200". The browser will ask for permission to access the MIDI device. Progress is shown live (Identity, Firmware Check, Slot Names).
Changes in the editor are sent to the device instantly: toggling effects, changing parameters, and reordering the signal chain. The device bar at the top shows the current slot and stays visible while scrolling.
If the GP-200 is connected when you load a .prst file or a gallery preset, the editor sends the whole preset to the device block by block as a live preview (not saved to a slot). The device bar shows the progress; loading another preset or disconnecting cancels the push in flight.
Use "Load" to pull a preset from the device. Click "Save to [Slot]" to save your changes directly to the device.
Double-click the preset name in the device bar to rename it directly (max 16 characters).

EXP / Controller Assignments

Open the Controller panel in the editor and assign up to three effect parameters each to EXP 1 (Mode A and Mode B) and EXP 2. Pick a parameter from the dropdown and set its min/max range (0–100). With the GP-200 connected, changes are sent to the device instantly via USB MIDI.

Gallery

Sign in and upload presets to your profile. Publish them to the gallery so others can discover them.
Each preset gets a unique share link. You can reset the link at any time to revoke access.
Browse the gallery for presets from other users and download them directly. Filter by style or module type.
Add a 30-second audio snippet (MP3 or M4A, max 30 s, max 2 MB) so others can hear your preset — when saving it to your account, or later on its share page.
On a preset's share page, signed-in users with a verified email can rate it (1–5 stars) and leave comments. You can't rate your own presets.

Bank Navigation

When you load a preset via USB, the entire bank (A/B/C/D) is loaded. Switch between the four slots using the tabs.
Use the arrow buttons on the left and right of the tabs to navigate to the previous or next bank.

Playlists & Cue Points

Create playlists with songs for your practice sessions or live performances. Each song can have multiple presets assigned.
Select device slots from your GP-200 to associate with each preset in a song. Presets are pushed to the device when activated.
Add timed cue points to songs: at a specific timestamp, the app can automatically switch presets or toggle effects on the device.
A 3-2-1 count-in is shown before each cue point triggers, so you can prepare for the preset change.
If the USB connection drops during a performance, the app will attempt to auto-reconnect without losing your playlist position.

Keyboard Shortcuts

Arrow Up / Arrow Down — previous / next song in the playlist player.
Arrow Left / Arrow Right — previous / next preset within the current song.
Arrow Up / Arrow Down on a focused effect slot header — move the effect up / down in the signal chain.

Frequently Asked Questions (FAQ)

The GP-200 is not detected or it still doesn't work — what can I check?

Go through these steps in order. 1) Use Chrome, Edge, another Chromium-based browser or Firefox 108+ on a computer — Safari and iPhone/iPad browsers have no Web MIDI. 2) Use a USB data cable (charge-only cables carry no MIDI) and switch the GP-200 on before you click "Connect GP-200". 3) Close every other program that may hold the MIDI port: the official Valeton editor, a DAW, MIDI tools or a second Preset Forge tab. 4) Allow MIDI access including SysEx when the browser asks. If you blocked it, re-enable MIDI for preset-forge.com in the site permissions next to the address bar and reload. 5) Unplug the cable, plug it back in, reload the page and connect again. 6) Check the firmware: Preset Forge is tested with firmware 1.8.0.

Does Preset Forge work on Linux (Ubuntu, Fedora, Manjaro, Mint)?

Yes. Preset Forge runs in the browser on any Linux distribution — Ubuntu, Fedora, Manjaro and Arch, Linux Mint and others (tested on Linux Mint). The GP-200 is a class-compliant USB MIDI device, so Linux needs no driver and no udev rules. For live USB editing use Chrome, Chromium, Brave, Edge or Firefox 108+. If the pedal does not appear, close other programs that use it (a DAW, another tab). Browsers installed as Snap or Flatpak run in a sandbox that may block MIDI access — if so, try your distribution's regular package or the browser vendor's own package. The official Valeton editor has no Linux version.

Step-by-step guide: the GP-200 on Linux

Does it work on Windows 11 and Windows 10?

Yes. Open the editor in Chrome, Edge or Firefox 108+ and connect the GP-200 by USB — Windows recognises it as a USB MIDI device, and Preset Forge needs no extra software. On Windows a MIDI port can usually be used by only one program at a time, so close the official Valeton editor, your DAW and other MIDI software before you click "Connect GP-200".

Does it work on a Mac?

Yes, in Chrome, Edge or Firefox 108+ on macOS. Safari does not support Web MIDI: in Safari you can still load, edit and save .prst files, but live USB editing needs one of the other browsers.

Does it work on a Chromebook (ChromeOS)?

Yes. ChromeOS runs the desktop version of Chrome, which supports Web MIDI with SysEx, so you can load, edit and save presets and connect the GP-200 by USB like on any other computer. Use a USB data cable and allow MIDI access when Chrome asks. Live USB editing on ChromeOS has not been hardware-tested yet — if the pedal does not connect, work through the troubleshooting steps above.

Does it work on Android?

Partly. You can load, edit and save .prst files in any Android browser, although the editor is designed for larger screens. Live USB editing is not supported on Android: Chrome for Android has Web MIDI and can reach the GP-200 through a USB-OTG adapter, but the connection is unreliable, and Firefox for Android has no Web MIDI at all. For live editing use a computer or a Chromebook.

Does it work on iPhone or iPad?

Only for files. On iOS and iPadOS every browser uses Apple's WebKit engine, which has no Web MIDI. You can load, edit and save .prst files, but you cannot connect the GP-200 by USB.

Firefox says Web MIDI requires a site permission add-on — what do I do?

That is expected. Firefox (version 108+ on desktop) only enables Web MIDI for a website after you install a small site-permission add-on, which Firefox generates itself for that site. Confirm the installation when Firefox asks, then allow MIDI access. You do this once for preset-forge.com. If you dismissed the prompt, reload the page and click "Connect GP-200" again. Firefox for Android has no Web MIDI.

Which browsers are supported?

The editor works in all modern browsers (Windows, macOS, Linux). USB MIDI needs Web MIDI: Chrome, Edge and other Chromium-based browsers, or Firefox 108+ on desktop (on first use Firefox installs a one-time site-permission add-on). Safari and mobile browsers are not supported.

Is Preset Forge available in other languages?

Yes: English, Deutsch, Español, Français, Italiano, Português, Português (Brasil). Change the language with the language switcher in the navigation bar.

Which firmware version is supported?

The app was tested with firmware 1.8.0. Other versions may work but are not officially supported.

What is the .prst format?

The .prst format is the proprietary preset file format of the Valeton GP-200. Each file is exactly 1224 bytes and contains 11 effect slots with up to 15 parameters each.

Does the app work offline?

Yes — Preset Forge is a PWA and works offline for editing presets. Gallery, profile, and playlist features require an internet connection.

Can I import Line6 HX Stomp presets?

Yes, experimentally. Load a .hlx file in the editor and the app will convert it to GP-200 format. Not all effects have a direct equivalent, so check the result.

Guides

In-depth guides: the GP-200 editor on Windows, Mac and Linux, the .prst file format, and using the GP-200 on Linux.

Read the guides

Changelog

All new features and fixes are listed in the changelog.

Open the changelog