helixgen 0.27.0

Generate Line 6 Helix Stadium .hsp / legacy .hlx preset files from JSON tone specs.

helixgen-core

The core Python library + CLI behind helixgen: generate Line 6 Helix Stadium .hsp presets (and legacy .hlx) from JSON tone recipes, edit them surgically in place, manage impulse responses by Stadium-exact content hash, and control a Helix Stadium directly over the LAN (OSC-over-ZeroMQ — no editor app).

⚠️ Unofficial tool — use at your own risk. Not affiliated with or endorsed by Line 6 / Yamaha (see Trademark notice). Loading any user-generated preset on your hardware carries risk — rejected loads, corrupted preset slots, on-device crashes. Review what you import. The MIT LICENSE disclaims all warranty.

Repo family

Repo	What it is
helixgen-core (this repo)	The helixgen Python package: libs + CLI (the engine's only surface)
helixgen	The Claude Code plugin — /tone, /setup, /device skills + marketplace
helixgen-tui	Terminal UI for tones, setlists, and device control

Want natural-language preset generation inside Claude Code? Install the plugin — you don't need this repo directly. This repo is for using the CLI/library standalone, or developing against it.

Install

Requires Python 3.11+. Published to PyPI:

pip install 'helixgen[device]'

Extras: device (network device control: pyzmq, msgpack, paramiko), dev (pytest).

A standalone install starts with an empty block library — seed it first:

helixgen bootstrap

Computing IR hashes from WAVs (register-irs <wav>, ir-scan) additionally needs libsndfile (brew install libsndfile / apt install libsndfile1).

Quick tour

helixgen list-blocks --category amp        # browse the block library
helixgen show-block "Brit Plexi Brt"       # exact param names/ranges
helixgen generate recipe.json -o tone.hsp  # author a preset from a recipe
helixgen set-param tone.hsp "Tape Echo Stereo" Mix 0.3   # surgical edit
helixgen view tone.hsp                     # read a .hsp back as a recipe
helixgen device list                       # talk to a Stadium on the LAN
helixgen device sync my-setlist            # mirror a managed setlist onto it

Full references:

• docs/CLI.md — every verb, including the complete helixgen device reference.
• docs/recipe-reference.md — the exhaustive recipe schema (paths, splits, snapshots, footswitches, expression, MIDI, Command Center, IRs).
• docs/ir-hash-algorithm.md — the reverse-engineered Stadium IR hash, field-validated.
• docs/helix-protocol.md — the network protocol.

Tests

Run from a source checkout with the package on PYTHONPATH:

PYTHONPATH=$PWD/src python -m pytest

Live integration suite (tests/live/)

An opt-in suite that drives the real CLI via subprocess against the user's real block library and a real Helix Stadium on the LAN. It is skipped entirely (fast, green) unless HELIXGEN_LIVE=1:

HELIXGEN_LIVE=1 PYTHONPATH=$PWD/src python -m pytest tests/live -q

Tests are grouped by impact area with registered markers — authoring, library, ir, device_read, device_write, liveops, setlists, sync, device_ir (plus live on everything and live_global for the extra-gated global-settings write) — so a targeted change can run just its blast radius, e.g.:

HELIXGEN_LIVE=1 PYTHONPATH=$PWD/src python -m pytest -m "live and sync" tests/live

Safety is enforced by fixtures: all local state (manifest, IR mapping, IR-hash cache, prefs, backups) is redirected to a scratch dir; an upfront device backup runs; device state is diffed before/after (the suite fails itself on any leak); every artifact is HGTEST-prefixed and torn down even on failure. See tests/live/conftest.py for the full safety model and the list of deliberately excluded verbs.

Acknowledgments

helixgen leans heavily on sensorium/phelix — a community-maintained, hand-curated repository of Helix block JSON files. The helixgen bootstrap command clones phelix and ingests its blocks/ directory; without that pre-extracted catalog the cold-start experience of this tool would be considerably worse.

Trademark notice

helixgen is an unofficial community project. Line 6, Helix, HX, and related product names are trademarks of Yamaha Guitar Group, Inc. helixgen is not affiliated with, endorsed by, or sponsored by Line 6 or Yamaha. References in this project to Line 6 hardware, file formats (.hlx, .hsp), and model identifiers are descriptive — helixgen generates files intended to be compatible with Line 6 Helix devices but is not a Line 6 product.

If you are a representative of Line 6 / Yamaha and have concerns about this project's name or scope, please open an issue.