Review Phase 3a before building on it, then implement Phase 3b.
The Phase 3a draft had four blocking defects: nodes were described as a
keyed map while every documented example carried an inline `id` field,
so under the strict unknown-field policy each minimal example would have
failed its own acceptance trace; no section said where a node lives; the
`audioMaxFrequency` ceiling was declared a semantic-stage error while
depending on a live AudioContext sample rate; and the sample-hold PRNG
child key that section 9.3 requires was undocumented. Close all four,
plus nine further gaps in noise seeding, spectral definitions, impulse
decay math, Nyquist handling, missing-field codes, LFO phase origin, the
units table, node-type staging, and a duplicated diagnostics table.
Add Format Specification section 15 for Phase 3b: nine processing and
routing node contracts, the component instance node, audio routing and
modulation with an explicit modulatable-property registry, twelve graph
legality rules, authoring limits, components with a component-scoped
`inputs.*` namespace, sound definitions and recipes, and buses.
Implement the subsystem in three modules. audio-contract.js holds the
declarative node, limit, and modulation tables every consumer reads.
audio-graph.js validates, expands components, and checks legality
without ever opening an AudioContext. audio-engine.js resolves node
fields once from the seeded stream, clamps frequencies to the live
device ceiling, realizes the graph through Web Audio, and owns the
runtime AudioSubsystem. Extend the schema, delegate the standalone
validator's audio checks to the shared module rather than carrying a
second implementation, and add a generic audio fixture.
Phase 3 is not accepted. Automation precedence, the lifecycle state
machine, unlock behavior, voice ceilings, and master protection are
Phase 3c. No sound has been heard from any build, so the audio
acceptance challenge, peak and finite-sample capture, and listening
observations remain open.
Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_011FWPdCqKaaDnP9NC3JAwh6
- Record user evidence for directory fallback to complete GC1 (10/10 checks passed)
- Expand Format Specification 0.1 to Revision 0.2 with normative shared contracts
- Author JSON Schema Draft-07 at schema/xzbt-0.1.schema.json
- Implement zero-dependency semantic validator at tools/validate-exhibit.mjs
- Create 12-case conformance fixture suite and automated test runner (12/12 passing)
- Update implementation status, verification gates, and gap closure decisions
- Add devlog entry covering stall recovery and Phase 0 current state
Labyricorn
