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Third and last site: the executable's play path. sub_821C5580's cue-1103 site is li r5,1103 / li r4,4 / lwz r3,0(r29) / bl 0x8217ACF8, i.e. play(this, category, cue_id). No volume is passed and no float argument is set up by the caller at all; the callee's prologue confirms r5 is the cue id with -2 and -1 sentinels. Honest limit stated: the callee saves f30/f31 so it uses floats internally and could look a level up for itself. "No gain is passed" is not "no gain exists" -- but there is nothing at this site for the port to transcribe. So F2 closes as undecodable-with-reach with all three sites checked: tables.pak cue records (exhaustive, passing control, and numbers carry names there so a gain would have had one), sound.pak bank headers (all 9519 entries, no readable header), and the play path (category, not level). The port authors the mix and now knows it is authoring, which is what this question existed to make explicit rather than accidental. The one authored value the game exposes is the user-facing sound options screen -- a runtime master, not a per-cue table. Refutation of the play-test's premise that "a cue record commonly carries a volume beside its wave index": REFUTED for this game across all three sites where it could live. Recorded because it was a good prior -- it is what sent me to the right three places -- and being wrong about where a value lives is different from being wrong to look. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.