Case study

Valeton GP-50 Editor: live preset editing over reconstructed SysEx

Valeton GP-50 Editor controls GP-50 and GP-5 guitar pedals through a reconstructed MIDI SysEx protocol. Its browser interface uses WebMIDI to inspect and edit presets, reorder blocks, rename slots and convert GP-5 and GP-50 .prst files. The repository also includes protocol tooling and findings about the vendor's NAM-to-SnapTone conversion path.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 19
Last commit: 2026-10-26
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-09

How evidence classes are assigned

Requirements & limits

Prerequisites: A GP-50 or GP-5 connected by USB and a WebMIDI-capable Chrome or Edge browser are required for live editing.
Limits: Chrome 152 has a documented SysEx framing regression; the source recommends Chrome 153 or newer.
Testing evidence: The author no longer owns test hardware, so later device I/O changes are checked against tests rather than a live pedal.
License: MIT license.

Cite

BibTeX

@misc{valeton-gp50-editor-case,
  title = {{Valeton GP-50 Editor: live preset editing over reconstructed SysEx}},
  howpublished = {\url{https://github.com/drewmerc302/valeton-gp50}},
  url = {https://github.com/drewmerc302/valeton-gp50},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/valeton-gp50-editor-case/}}
}

Plain text

Valeton GP-50 Editor: live preset editing over reconstructed SysEx. https://github.com/drewmerc302/valeton-gp50 (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/valeton-gp50-editor-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · drewmerc302/valeton-gp50 · Revision 47b2b58
re/REFIT_FINDINGS.md GitHub · drewmerc302/valeton-gp50 · Revision 47b2b58
LICENSE GitHub · drewmerc302/valeton-gp50 · Revision 47b2b58