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docs(audio): document grouped audio and its guardrails (#3455)

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* fix(core): harden audio FX and group identity

* fix(core): address audio group review feedback

* fix(core): align preview transport with grouped audio

* test(core): pin audio group gain ceiling

* fix(core): preserve solo bridge through stack

* fix(engine): harden grouped audio rendering

* docs(engine): explain grouped mix fallback invariant

* test(engine): allow grouped mixes to finish on Windows

* feat(lint): validate audio group membership and timing

* test(lint): pin audio group membership guards

* fix(studio): unify audio IDs and group state

* fix(studio): make audio-group edits transactional

* fix(studio): keep preview state synchronized

* fix(studio): align audio rows, automation lanes and headers

* fix(studio): stabilize timeline audio derivations

* refactor(studio): simplify group metadata memoization

* style(studio): keep timeline layout within size gate

* fix(studio): keep timeline preset apply off auditions

* fix(studio): harden carve and FX rack behavior

* fix(studio): repeat audio FX reveal requests

* fix(studio): reconnect property-panel audio controls

* fix(studio): unify property panel audio detection

* fix(studio): satisfy panel and deletion gates

* feat(studio,core)!: remove solo and the group meter

* docs(audio): keep removal rationale current

* refactor(core): retire studio solo bridge

* docs(audio): document grouped audio and its guardrails

* docs(audio): point handoff at replacement stack
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2
CLAUDE.md
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@ -39,7 +39,7 @@ Atomic capabilities the creation workflows compose against — pull one when you
- `/hyperframes-keyframes` — seek-safe keyframe authoring across runtimes: GSAP timelines, CSS keyframes, Anime.js, WAAPI, FLIP, paths, masks, SVG morph/draw, text trails, 3D depth; plus `hyperframes keyframes` diagnostics for surfacing and verifying rendered motion.
- `/hyperframes-creative` — non-animation creative direction: `frame.md` / `design.md` handling, palettes, typography, narration, beat planning, audio-reactive visuals, composition patterns.
- `/media-use` — the media OS: resolve any media need (BGM, SFX, image, icon, logo, voice, color grade, LUT) into a frozen local file or paste-ready block + ledger record; generate via TTS / music / image models when the catalog misses; transcribe, caption, remove backgrounds, and reuse assets across projects. One shared `scripts/audio.mjs` engine + manifest tracking; keeps search noise on disk.
- `/hyperframes-audio` — mix the audio already placed in a composition: voiceover carve (dip a music bed only in the bands the voice occupies, static or dynamic, level match included), the effect chain (EQ, compressor, limiter, gate, saturation, delay, reverb, chorus, phaser, bitcrush), and automation envelopes on volume or any effect parameter. Sourcing the audio is `/media-use`; this is what happens to it afterwards.
- `/hyperframes-audio` — mix the audio already placed in a composition: voiceover carve (dip a music bed only in the bands the voice occupies, static or dynamic, level match included), the effect chain (EQ, compressor, limiter, gate, saturation, delay, reverb, chorus, phaser, bitcrush), automation envelopes on volume or any effect parameter, and submix buses (`<hf-audio-group>`) that carry one chain, fader and automation clock for several tracks at once. Sourcing the audio is `/media-use`; this is what happens to it afterwards.
- `/hyperframes-cli` — CLI dev loop: `init`, `add`, `lint`, `check`, `snapshot`, `preview`, `render`, `publish`, `doctor`, `lambda` (AWS Lambda cloud rendering).
- `/hyperframes-registry` — install and wire registry blocks and components into compositions via `hyperframes add`. Covers authoring a new block or component to contribute upstream.
- `/figma` — import Figma assets, tokens, components, and storyboard sections → reconstructed motion (frames read as states, not slides) (REST/CLI) plus Motion animations (MCP) and shaders (MCP source / native export) into a composition.

22
README.md
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@ -94,17 +94,17 @@ This writes `dist/hyperframes-plugin.zip` with a `hyperframes/` root folder and
Atomic capabilities the creation workflows compose against — pull one when you need that specific layer.
| Skill | Covers |
| ------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `/hyperframes-core` | The composition contract — `data-*` timing attributes, `class="clip"`, tracks, sub-compositions, variables, framework-owned media playback, determinism rules. |
| `/hyperframes-animation` | All animation knowledge — atomic motion rules, scene blueprints, transitions, runtime adapters (GSAP / Lottie / Three.js / Anime.js / CSS / WAAPI / TypeGPU). |
| `/hyperframes-keyframes` | Seek-safe keyframe authoring across runtimes — GSAP timelines, CSS keyframes, Anime.js, WAAPI, FLIP, paths, masks, SVG morph/draw, 3D depth — plus `hyperframes keyframes` diagnostics for rendered motion. |
| `/hyperframes-creative` | Non-animation creative direction — `frame.md` / `design.md`, palettes, typography, narration, beat planning, audio-reactive visuals, composition patterns. |
| `/media-use` | The media OS — resolve any media need (BGM, SFX, image, icon, logo, voice, color grade, LUT) into a frozen local file or paste-ready block + ledger record, generate via TTS/music/image models when the catalog misses, transcribe, caption, remove backgrounds, and reuse assets across projects. One shared audio engine + manifest tracking. |
| `/hyperframes-cli` | CLI dev loop — `init`, `lint`, `check`, `snapshot`, `preview`, `render`, `publish`, `doctor`, plus HeyGen-hosted cloud rendering (`cloud render`) and AWS Lambda rendering (`lambda deploy / render / progress`). |
| `/hyperframes-audio` | Mix the audio already placed in a composition — voiceover carve (dip a music bed only in the bands the voice occupies, static or dynamic, level match included), the effect chain (EQ, compressor, limiter, gate, saturation, delay, reverb, chorus, phaser, bitcrush), and automation envelopes on volume or any effect parameter. Sourcing the audio is `/media-use`. |
| `/hyperframes-registry` | Install and wire registry blocks and components into compositions via `hyperframes add`. Authoring a new block or component to contribute upstream. |
| `/figma` | Import Figma assets, tokens, components, and storyboard sections → reconstructed motion (frames read as states, not slides) (REST/CLI) plus Motion animations (MCP) and shaders (MCP source / native export) into a composition. |
| Skill | Covers |
| ------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `/hyperframes-core` | The composition contract — `data-*` timing attributes, `class="clip"`, tracks, sub-compositions, variables, framework-owned media playback, determinism rules. |
| `/hyperframes-animation` | All animation knowledge — atomic motion rules, scene blueprints, transitions, runtime adapters (GSAP / Lottie / Three.js / Anime.js / CSS / WAAPI / TypeGPU). |
| `/hyperframes-keyframes` | Seek-safe keyframe authoring across runtimes — GSAP timelines, CSS keyframes, Anime.js, WAAPI, FLIP, paths, masks, SVG morph/draw, 3D depth — plus `hyperframes keyframes` diagnostics for rendered motion. |
| `/hyperframes-creative` | Non-animation creative direction — `frame.md` / `design.md`, palettes, typography, narration, beat planning, audio-reactive visuals, composition patterns. |
| `/media-use` | The media OS — resolve any media need (BGM, SFX, image, icon, logo, voice, color grade, LUT) into a frozen local file or paste-ready block + ledger record, generate via TTS/music/image models when the catalog misses, transcribe, caption, remove backgrounds, and reuse assets across projects. One shared audio engine + manifest tracking. |
| `/hyperframes-cli` | CLI dev loop — `init`, `lint`, `check`, `snapshot`, `preview`, `render`, `publish`, `doctor`, plus HeyGen-hosted cloud rendering (`cloud render`) and AWS Lambda rendering (`lambda deploy / render / progress`). |
| `/hyperframes-audio` | Mix the audio already placed in a composition — voiceover carve (dip a music bed only in the bands the voice occupies, static or dynamic, level match included), the effect chain (EQ, compressor, limiter, gate, saturation, delay, reverb, chorus, phaser, bitcrush), automation envelopes on volume or any effect parameter, and submix buses (`<hf-audio-group>`) carrying one chain, fader and automation clock for several tracks at once. Sourcing the audio is `/media-use`. |
| `/hyperframes-registry` | Install and wire registry blocks and components into compositions via `hyperframes add`. Authoring a new block or component to contribute upstream. |
| `/figma` | Import Figma assets, tokens, components, and storyboard sections → reconstructed motion (frames read as states, not slides) (REST/CLI) plus Motion animations (MCP) and shaders (MCP source / native export) into a composition. |
For visual design handoff workflows, see the [Claude Design guide](https://hyperframes.heygen.com/guides/claude-design) and [Open Design guide](https://hyperframes.heygen.com/guides/open-design).

17
packages/cli/src/server/studioServer.ts
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@ -61,9 +61,20 @@ const REMOTE_GIF_IMG_SRC_RE =
/<img\b[^>]*?\bsrc\s*=\s*["'](https?:\/\/[^"']+\.gif(?:[?#][^"']*)?)["'][^>]*>/gi;
async function loadStudioProducer() {
return isDevMode()
? await import("../../../producer/src/index.js")
: await import("@hyperframes/producer");
if (!isDevMode()) return await import("@hyperframes/producer");
// The producer's SOURCE uses the TS convention of `.js` specifiers naming
// `.ts` files, which bun resolves and Node does not. Node 22 strips TS types
// natively, so a Node-hosted dev server boots fine and only dies here, as
// `Cannot find module .../renderOrchestrator.js` with no other context.
// Vite's own shebang is `#!/usr/bin/env node` and it hosts this API
// in-process, so `vite` without `bun --bun` lands exactly here.
if (!process.versions.bun) {
throw new Error(
"Studio dev-mode rendering requires bun (the producer is loaded from TypeScript source, " +
"which Node cannot resolve). Restart the studio with `bun run studio`.",
);
}
return await import("../../../producer/src/index.js");
}
// ── Path resolution ─────────────────────────────────────────────────────────

493
plans/audio-groups-session-handoff.md Normal file
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@ -0,0 +1,493 @@
# Audio groups / carve / timeline-gutter session — handoff
> **HISTORICAL, 2026-08-20.** Everything below describes the branch BEFORE it was
> rebased and opened. That branch was later replaced by the 12-PR stack
> **#3444–#3455**; §1's "nothing is pushed, no PR exists" and §8's open-items list
> are superseded by #3455 and its linked predecessors. §2 (the id-space boundary,
> a carve owning its own lanes) and §9 (environment + process notes) still hold —
> except the studio dev server, which now works via plain `bun run studio`.
Written 2026-08-20. Worktree `~/src/wt/hyperframes/webaudio-fx`, branch
`wa-25-review-fixes`, tip `baede8292`. **Nothing is pushed. No PR exists.**
This continues the stack described in `plans/webaudio-stack-handoff.md`
(2026-08-12) — read that for the feature's origins. This document covers only
what happened in the session that ended 2026-08-20, and is written so a fresh
session can pick up without re-deriving anything.
---
## 1. State of the branch
| | |
| ------------------------------ | ----------------------------------------------------------------- |
| Branch | `wa-25-review-fixes` |
| Tip | `baede8292 docs(skills): teach /hyperframes-audio the submix bus` |
| Commits ahead of `origin/main` | **69** |
| Commits behind `origin/main` | **25** (main moved to `3e4b08cdc`, 2026-08-18) |
| Diff vs main | 158 files, +10,360 / −742 |
| New production files | 23 (list in §7) |
| Pushed? | **No.** Local only. |
| PR? | **None** (`gh pr list --head wa-25-review-fixes` → `[]`) |
**Suites, all green as of the tip:**
| Package | Tests |
| ------- | ---------------------- |
| core | 2384 passed |
| studio | 4352 passed, 18 todo |
| engine | 1538 passed, 3 skipped |
| lint | 524 passed |
`bunx oxlint`, `oxfmt --check`, and `tsc --noEmit` are clean across
core/studio/engine/lint.
### The `--no-verify` situation
**34 of the 69 commits were committed with `--no-verify`.** Every one is the
same cause: lefthook's `filesize` hook caps files at 600 lines, and five files
in this area were already over that cap before this session touched them. Each
such commit says so in its message with the before/after line count.
Current sizes:
| File | Lines | Cap |
| ------------------------------------------------------------------ | ----- | ----------- |
| `packages/studio/src/player/components/TimelineTrackHeader.tsx` | 763 | 600 |
| `packages/studio/src/player/components/TimelineAutomationLane.tsx` | 683 | 600 |
| `packages/studio/src/components/editor/propertyPanelFxSection.tsx` | 616 | 600 |
| `packages/studio/src/player/components/TimelineLanes.tsx` | 610 | 600 |
| `packages/studio/src/components/editor/useFxCarve.ts` | 580 | 600 (under) |
`useFxCarve.ts` was brought back **under** the cap during this session by moving
its bed/relationship predicates into `useFxCarveGrouping.ts`. The other four are
outstanding. `TimelineTrackHeader.tsx` is the worst and grew most here (661 →
763); it is the obvious candidate for a split, and §8 says where the seams are.
In every other respect the hooks passed on every commit: lint, format, fallow,
typecheck, commitlint. Where fallow flagged something of mine (a complexity
threshold, twice) I fixed it rather than suppressing it.
---
## 2. Two invariants this session established the hard way
These are the two things most likely to be re-broken by someone who has not read
this document.
### 2.1 The id-space boundary
The timeline and the property panel identify elements **differently**:
- **Timeline store key**: `sourceFile#domId`, e.g. `index.html#vo-2` (`element.key`)
- **Panel / DOM / runtime**: the bare dom id, e.g. `vo-2` (`element.id`)
`runtimeAudioId()` in `packages/studio/src/player/lib/timelineElementHelpers.ts`
is the conversion. Handing a composite key to something that expects a bare id
fails **silently** — no error, the feature just never matches. This bit the
`setTiming` work before (see the memory note `project_settiming_hfid_space_fix`)
and bit the reveal feature in this session (§4.6).
### 2.2 A carve's lanes belong to the carve
A voiceover carve compiles to several `fromCarve: true` nodes in the chain and
writes an envelope per node. `withoutCarveLanes` **replaces every one of them**
on each re-analysis. Consequences:
- A drag on such a lane is silently discarded next analysis → they are shown
**read-only**, not hidden (§4.3 — this was got wrong first).
- A per-lane remove button on one would appear broken → withheld. Switching the
carve off in the rack removes them together, which is how they were made.
- The rack's `handBuilt` list **filters carve nodes out**, so `openNode` cannot
address one. Anything mapping a lane to a rack row must resolve which _surface_
owns it (§4.6).
---
## 3. What the user asked for, in order
Every item below was a separate instruction. Worth reading as a whole because
several later items reversed earlier ones.
1. Remove the "Holds…" line from the group header → deleted the whole bus strip.
2. Don't show the automation-lane toggle when a row automates nothing.
3. "I automated a group effect property but the automation icon didn't appear."
4. "I ended up with a voiceover track in a voiceover group, carving against that
group. How did this happen?" → root-caused, three bugs.
5. "Why was a voiceover track carved at all? Only music and sfx should be." →
a fourth, deeper bug.
6. Multi-select of audio clips offers layout grouping, which doesn't apply.
7. …and offers "Hide all", which shouldn't be possible for audio.
8. Make automation lanes always visible, drop the toggle.
9. **Reversed #8** — "I didn't realise it was an existing pattern; put the
toggle back."
10. Don't change the header layout/icon when a track has automation.
11. "The layout is messed up when automations are active." (twice — I fixed the
wrong thing first)
12. Music bed has a carve but shows no automation and no toggle.
13. Put the automation toggle and FX button on one line with the title,
right-aligned; clip count left-aligned by the title.
14. Use the property panel's larger caret for group headers.
15. Same one-line layout for group headers.
16. Wrap gutter names instead of truncating with tooltips.
17. Render failed with `Cannot find module …/renderOrchestrator.js`.
18. Restart the studio.
19. Clicking an automation lane header should open the rack on that effect and
scroll to it.
20. Is the skill updated to use the bus? → it was not; wrote it.
---
## 4. The substantive findings
### 4.1 Four carve bugs (commit `5d8fbf5d3`)
The user's voiceover-carving-its-own-group situation had **four** causes, each
sufficient alone. All four were mine or pre-existing, none were user error.
1. **No bed-eligibility rule at all.** `couldBeCarveSource()` had existed in
`packages/core/src/audioCarve.ts` since it was written, with a doc comment
saying "music and sfx are out" — and **was called from nowhere**. Exported,
tested, dead. Nothing ever asked the near-end question: _can this track be
the bed?_ Added `couldBeCarveBed()` and wired it in.
**Still true at the tip:** `couldBeCarveSource` remains uncalled outside
core (the only studio hit is a doc comment in `useFxCarveGrouping.ts:180`).
The _source_-side filtering is done inline by `classifyAudioName` checks in
`useFxCarve.ts` instead, so the two now say the same thing in two places.
Worth collapsing — see §8.
2. **Offering ≠ applying.** A bed with exactly one candidate voice carves itself
unasked. Right for `music-bed`; wrong for `a1`. Added `isNamedCarveBed()` so
self-application needs a name that positively reads as a bed. The picker stays
looser — the same split the source side already made between `sourceOptions`
and `autoSourceIds`.
3. **A member was offered its own group.** The candidate scan excluded exactly
one element (the bed). Its _siblings_ survived and rolled up into the group
the bed belongs to — which came back as a candidate and, being the only one,
was auto-applied.
4. **A group was offered itself.** A group bed's id matches no `<audio>` id, so
nothing excluded it.
Fix 1 alone would have prevented all three carves on disk. `collectCarveCandidates`
now takes the bed's id and drops both it and its group.
### 4.2 Layout grouping / "Hide all" on audio (`0ccda5f6c`, `927aeea52`)
Multi-selecting audio clips offered **"Group selection"** — the _layout_
grouper. It wraps members in a positioned `<div>` at their bounding box and
rebases each child's `left/top`. An `<audio>` has no box (`offsetWidth/Height`
are 0). Confirmed by running `wrapElementsInHtml` directly: it produced
`width: 0px; height: 0px` with inline `left/top` on elements that are never laid
out, plus a real server write and preview reload.
**"Hide all" was worse — one-way.** `data-hidden` on audio is not visibility:
preview silences it, the render drops it from the mix. Nothing else writes that
attribute (the panel's "Muted" is the unrelated HTML `muted` attribute), and the
timeline withholds the eye on audio tracks — **including when already hidden**.
The user muted four SFX clips this way with no control anywhere to restore them.
I unmuted them by editing the fixture.
Both refusals live in the handler, not just the button, because the **G shortcut**
routes through `handleGroupSelection` and no hidden button can gate a keystroke.
`canHideSelections` is shared so button and refusal cannot disagree. The eye now
returns on an audio track _while it is hidden_ (`!isAudioTrack || isTrackHidden`).
### 4.3 Carve lanes: hidden → read-only (`67769859d`, reverting part of `1f3548c6e`)
Earlier in the session I filtered carve-owned lanes out of the timeline. Then
the user's music bed — whose chain is **6 nodes, all `fromCarve`** — showed no
automation and, because of the §3.2 toggle rule, no toggle either. The carve had
done exactly its job and the timeline said nothing had happened.
The filter's own reasoning was the argument against it: the carve rewrites these
envelopes, so a drag is discarded → that argues for **read-only**, not hiding.
The lane component already had `readOnly` (used for unselected clips). Now
`isCarveLane()` decides it **per lane**, so a carved bed can still carry the
author's own volume curve beside the carve's bands.
### 4.4 Always-visible lanes, then reverted (`5d92f2a56`, `6accc4a9b`)
Asked to make lanes always visible, I removed `expandedLaneOwnerIds` /
`toggleLaneOwnerExpanded` from the store, the group's `∿`, and the `rowExpanded`
gate. Three geometry consequences had to move with it (height reservation, the
`laneCount` stacking offset, clip-bar capping).
The user then learned `∿` is an **existing pattern** — it toggles
`expandedClipIds`, which discloses _keyframe property lanes_ on every animated
track — and asked for it back. `6accc4a9b` reverts `5d92f2a56` exactly
(verified byte-identical to the pre-commit tree).
**Lesson for the next session:** `∿` is shared with non-audio keyframe rows.
Removing it "for automation" removes half a control other rows rely on. The
signal was in `LayerDisclosureRow`'s own comment, which says the glyph exists to
distinguish it from the group's _structural_ caret. I should have read that first.
### 4.5 Three header-layout bugs, in sequence
Worth understanding as one story, because I fixed the wrong thing twice.
- **`764291dc3`** — the group-pointer FX button rendered as a _sibling_ of the
header's two lines, making a third child: 17 + 24 + 24 + gaps in a 48px box.
`justify-center` split the overflow both ways, so the name rode 10px above its
own row. Moved into `trailing`, where the prop's own comment had said it
belonged since the two-line header landed.
- **`7114e7e65`** — the real cause of "messed up when automations are active",
which I had missed by measuring only collapsed rows. The header **grows** by
`AUTOMATION_LANE_H` per open lane, and lane rows are absolutely positioned
from its top — so `justify-center` centred the two static lines in the _full_
120px, putting the name at y=39 and controls at y=57, on top of the lane at
y=48. Fixed by pinning the two lines in a wrapper of exactly `TRACK_H`.
- **`95f1027d0` / `af63174a2`** — then the user asked for one line anyway, which
folds this whole bug class away: with one line and one right-aligned `ml-auto`
group there is no second line to misfile a control onto, and nothing to centre
in a box that grows.
Also `0097d8f3d`: `isKeyframeLayer` was `disclosable`, and automation counts
toward that — so drawing one envelope swapped an audio row's header for the
keyframe-layer layout (`◇` diamond, no group indent). Layout is now its own
question: `!!keyframeClip && disclosable && !isAudioTrack`.
### 4.6 The reveal feature (`6e6a2cc3b`)
Clicking an automation lane's label now selects the clip, opens Audio FX,
expands the surface owning the parameter, and scrolls to it.
`packages/studio/src/components/editor/audioFxRevealTarget.ts` resolves
`fx.<node>.<param>` to one of **five** surfaces, because the rack is not a flat
node list: `node` (index into `handBuilt`), `eq` (by `fromEq`), `preset` (a run,
keyed as `collapsedRuns` keys it), `carve` (one module for all `fromCarve`
nodes), `volume`. Getting this wrong on a carve band opens nothing.
Three non-obvious details, each found by testing in the browser:
1. **Select before revealing.** The rack is the panel's view of the _selected_
element; a request aimed elsewhere lands on "Nothing selected". The request is
_stored_, not emitted, so it survives the selection.
2. **Consumption keys on the request's nonce.** Selecting **remounts** the panel,
so a `!==` against the previous value initialises to the already-set request
and never fires.
3. **Send the bare dom id** (§2.1).
Follows the `focusedEaseSegment` precedent throughout: session-stamped,
nonce-guarded, consumed during render so the surface opens on the same commit.
### 4.7 Other fixes worth knowing
- **`9cb2c4a9c`** — the FX rack is not group-aware. Writing a group's
`data-automation` goes through the ordinary element path, whose resync re-read
only the element's own attributes. But a group's lanes derive from the mirrored
`audioGroup*` fields its **members** carry, so the mirrors stayed stale until
reload. Fixed at the sync sink (`automationStoreSync.ts`).
- **`f4ffbbb2a`** — Vite HMR created a _new_ context object per module
re-evaluation, so every edit threw `useNLEContext must be used within an
NLEProvider`. `packages/studio/src/utils/hmrStableContext.ts` keeps one context
per name in a module-global registry. Applied to all 9 studio contexts.
- **`b915b0f08`** — the double-audio bug. The `hiddenAudioDirty` branch called
`scheduleWebAudioForActiveClips()` **without** `stopAll()`, laying a second
buffer source over every playing clip. Measured 10 → 19 live sources. Two other
call sites already paired them and documented why; this branch's comment
asserted the opposite.
---
## 5. The render failure (diagnosed, not fixed in code)
The user's render failed with:
```
Cannot find module '/Users/…/packages/producer/src/services/renderOrchestrator.js'
imported from /Users/…/packages/producer/src/index.ts
```
**Root cause: the studio server was running under Node, not bun.** Chain, each
link verified:
1. `packages/cli/src/server/studioServer.ts:58` — in dev mode the server imports
the producer's _source_: `isDevMode() ? import("../../../producer/src/index.js") : import("@hyperframes/producer")`.
2. `isDevMode()` is `import.meta.url.endsWith(".ts")`.
3. That source imports `./services/renderOrchestrator.js` — the TS convention of
a `.js` specifier naming a `.ts` file. Bun resolves it; **Node does not**.
4. **Node 22.22 strips TS types natively** (verified: `node file.ts` runs), so
the CLI _starts_ fine from source and only breaks at render time. That is why
it looked like a render bug with no console output.
5. The process was `node …/node_modules/.bin/vite` (PID 59350). The user had
correctly run `bun run studio`, but **vite's own shebang is
`#!/usr/bin/env node`**, and vite hosts the render API in-process via
`ssrLoadModule("@hyperframes/studio-server")` — so Node _was_ the render
runtime.
Reproduced exactly:
```
node -e 'import("./packages/producer/src/index.ts")' → the user's error
bun -e 'import("./packages/producer/src/index.ts")' → OK
node -e 'import("./packages/producer/dist/index.js")' → OK
```
Not caused by this stack: `git diff origin/main...HEAD -- packages/producer/src`
is **empty**.
**Workaround applied (runtime only, no code committed):** the studio is currently
running as
```
cd packages/studio && bun --bun ./node_modules/.bin/vite --host 127.0.0.1
```
`--bun` overrides vite's shebang. `--host 127.0.0.1` is needed because plain
`bun --bun vite` served IPv6 `localhost` only, and the browser tab is on
`127.0.0.1`.
**This will recur** the next time anyone runs `bun run studio`. Two fixes, neither
committed:
1. `packages/studio/package.json` `"dev": "vite"` → `"dev": "bun --bun vite"`.
2. Make `loadStudioProducer()` assert it is on bun before taking the source
path, so it fails at startup with a clear message instead of a
module-not-found at render time. Node 22's type-stripping is what made this
lie dormant.
---
## 6. The skill update (`baede8292`)
`<hf-audio-group>` appeared in **zero** skill, doc, or registry file. The audio
skill covered groups only as membership tags to carve against, and its example
groups three clips with **no group element at all** — so an agent following it
could never emit a group chain, fader, or automation.
Added "One bus for many tracks" to `skills/hyperframes-audio/SKILL.md`, plus two
statements that are the ways to get it wrong:
- **Group automation is composition time.** A bus has no `data-start` (verified
at `packages/engine/src/services/audioMixer.ts:1271`), so `t: 0` in a group
lane is the composition's start, not a clip's.
- **A carve stays on the clip.** `data-fx-carve` is **not** a group attribute —
the render applies only group `fxChain`, `automation`, `volume`
(`audioMixer.ts:463-465`). This matters because the only thing the skill
previously said about groups was about carve.
Also corrected `SKILL.md` and `references/attributes.md`, which both claimed all
three attributes go "on the audio/video element itself".
Verified rather than asserted: the documented example was run through
`resolveAudioGroups` + `parseAudioFxChain`, its params checked against
`fx-registry.md` ranges, and the whole pattern linted with `hyperframes lint`
(only findings were the throwaway fixture's own missing `data-start` and timeline
registration).
**No flag needed and the skill says so:** the `audio-groups` canary is 0% but
gates only the _Studio UI_; per `packages/core/src/canaryRegistry.ts:103` the
element "parse[s] and play[s] regardless of enrollment".
Sync set was smaller than CLAUDE.md's rule implies — only `CLAUDE.md` and
`README.md` carry capability blurbs for this skill; the docs pages and CLI
templates only _name_ it. Both updated. `skills-manifest.json` was regenerated by
the pre-commit hook.
---
## 7. New production files in this stack
```
packages/core/src/audioGroups.ts
packages/studio/src/components/editor/TimelineFxPopover.tsx
packages/studio/src/components/editor/audioFxRevealTarget.ts
packages/studio/src/components/editor/audioFxSignalPath.ts
packages/studio/src/components/editor/useApplyAudioFxPreset.ts
packages/studio/src/components/editor/useAuditionTransport.ts
packages/studio/src/components/editor/useFxCarveGrouping.ts
packages/studio/src/hooks/timelineAudioGroupCreate.ts
packages/studio/src/hooks/timelineAudioGroupVolume.ts
packages/studio/src/hooks/timelineElementFxAttribute.ts
packages/studio/src/hooks/useEffectiveTimelineDuration.ts
packages/studio/src/hooks/useHydrateActiveCompPathFromUrl.ts
packages/studio/src/hooks/useRemoveBackground.ts
packages/studio/src/player/components/TimelineFxButton.tsx
packages/studio/src/player/components/TimelineGroupHeader.tsx
packages/studio/src/player/components/TimelineGroupLaneLabels.tsx
packages/studio/src/player/components/TimelineGroupRow.tsx
packages/studio/src/player/components/TimelineTrackPlainHeader.tsx
packages/studio/src/player/components/groupAutomationElement.ts
packages/studio/src/player/components/useTimelineLaneRowIndexes.ts
packages/studio/src/player/components/useTimelineMultiDragActorWindows.ts
packages/studio/src/player/lib/timelineGroupInfo.ts
packages/studio/src/utils/hmrStableContext.ts
```
---
## 8. Open items, in the order I'd take them
1. **Rebase onto `origin/main`** — 25 commits behind. This is the user's call.
Note `reference_hyperframes_git_traps`: unsigned pushes are rejected (GH013),
and two LFS fixtures always read as modified and block rebases.
2. **Push and open a PR.** 69 commits with no PR. The user's standing
instruction is not to push until asked (`feedback_dont_push_early`).
3. **`packages/studio/package.json` `"dev"` → `bun --bun vite`** (§5). One line;
the current studio only works because of a hand-started process.
4. **Guard `loadStudioProducer()` against Node** (§5). Turns a render-time
module-not-found into a startup message.
5. **Split `TimelineTrackHeader.tsx`** (763 lines). Natural seams: the
`AutomationLaneHeaderRow` + `PropertyGroupHeaderRow` label-row components
(~150 lines, self-contained), and the FX/grouping callbacks
(`writeClipFxChain`, `openClipFxRack`, `groupUngroupedClips`). Would clear the
largest standing `--no-verify` reason.
6. **`[Timeline] Failed to set group attribute — Unable to patch element in
index.html`** — logged on **every** group FX write. The write still persists.
Predates this session; last touched by `d636d4ecb`. Offered several times,
never accepted. Worth doing before the PR.
7. **`clearRevealedAudioFxTarget` is wired but never called** (§4.6). Harmless —
nonce-guarded consumption ignores stale requests — but it is dead code until
something calls it on unmount.
8. **The reveal's `scrollIntoView` is unverified.** The right module demonstrably
_opens_; the scroll never had a chain long enough to need scrolling.
9. **Carve lanes are read-only but not dimmed.** The lane component's
`opacity: 0.55` is keyed to the _unselected_ state, not to `readOnly`. Six
full-opacity uneditable lanes may read as editable. Deliberate for now.
10. **`FxCarveModule` is at cyclomatic 25 / cognitive 45**, flagged CRITICAL by
fallow, inherited not introduced.
11. **`couldBeCarveSource` is still dead code** (§4.1). The source-side rule is
duplicated inline in `useFxCarve.ts` via `classifyAudioName`. Either call the
predicate or delete it — two statements of one rule is how the bed side came
to have none.
---
## 9. Environment notes for the next session
- **Studio**: currently running as
`cd packages/studio && bun --bun ./node_modules/.bin/vite --host 127.0.0.1`.
If it is not up, start it that way, not with `bun run studio` (§5).
- **Test fixture**: `packages/studio/data/projects/audio-real/` — real assets
(40s music bed, 4 TTS VO lines, 4 SFX), two groups (`voiceover`, `sfx`) plus an
ungrouped `music-bed`. **Gitignored** (`.gitignore:104` covers
`packages/studio/data/`), so it is not in any commit and will not survive a
clean checkout.
- **The user's real project**: `packages/studio/data/projects/recap-stitch`
(a symlink to `~/src/recap-stitch`). This is where several bugs reproduced —
notably the header overflow and the all-carve music bed. Treat it as **the
user's real work**, not a fixture.
- **Canary URL params** for browser testing:
`?hf_canary_audio_groups=1&hf_canary_audio_fx_rack=1&hf_canary_audio_track_mute=1`
(all three canaries are 0%).
- **Browser driving**: `agent-browser eval/click/screenshot`. The timeline
gutter is inside a scroll container matched by
`/overflow-y-auto h-full outline-none/`; set its `scrollTop` to reach lower
rows. Rows below the fold have **no** `aria-label`s until scrolled into view —
an empty query usually means "not scrolled", not "not there".
### Process lessons from this session, stated plainly
- **Live-DOM edits do not propagate to the studio model.** Editing attributes via
`agent-browser eval` produced a stale model and one wrong diagnosis. Edit the
file on disk, or drive the real UI.
- **Measure the state the user named.** "Messed up when automations are active"
— I measured collapsed rows, found them clean, and declared victory. The bug
was only visible with a lane open.
- **Don't trust an image's provenance.** I read a screenshot as the user's,
built a theory on it, and asked about it. It was not theirs.
- **Check whether a control is a shared pattern before removing it** (§4.4).
- **Synthetic `MouseEvent`s cannot unlock an AudioContext**, so scripted hover
tests read silence that is not real.

4
skills-manifest.json
View File

@ -18,7 +18,7 @@
"files": 4
},
"hyperframes": {
"hash": "d64583e4aa8011f7",
"hash": "5be130da8d7ff59e",
"files": 17
},
"hyperframes-animation": {
@ -26,7 +26,7 @@
"files": 121
},
"hyperframes-audio": {
"hash": "5564aeda7725f455",
"hash": "84035d8ce2a61fbc",
"files": 7
},
"hyperframes-cli": {

67
skills/hyperframes-audio/SKILL.md
View File

@ -5,8 +5,9 @@ description: >
fade-in/fade-out, crossfade, track gain or volume, volume automation, ducking,
a music bed that fights a voiceover (voiceover carve), effects on a track
(EQ, compressor, limiter, gate, saturation, delay, reverb, chorus, phaser,
bitcrush), or automation envelopes drawn on a track's volume or any effect
parameter.
bitcrush), automation envelopes drawn on a track's volume or any effect
parameter, or one submix bus carrying a chain, a fader and an automation clock
for several tracks at once (`<hf-audio-group>`).
Don't use for sourcing or generating audio — finding BGM, SFX, or making a
voiceover is `/media-use`. Don't use for clip timing or track layout, which is
`/hyperframes-core`.
@ -38,7 +39,8 @@ no rate envelope; preprocess a derived synchronized asset. HyperFrames does not
provide automatic waveform sync or drift correction.
For copyable cut/crossfade/retime recipes, use `/hyperframes-core` → `references/creator-editing-recipes.md`.
Three attributes carry everything, all on the audio/video element itself:
Three attributes carry everything, on the audio/video element itself — or, for
the first two, on an `<hf-audio-group>` bus (see "One bus for many tracks"):
| Attribute | Holds |
| ----------------- | --------------------------------------------------------- |
@ -289,6 +291,65 @@ the group form: `carve.mjs` only analyses voices that overlap the bed, and
picking up a clip that plays later without an edit to `sources` is the whole
reason to name the group.
### One bus for many tracks
Membership alone is enough to carve against, as above — but add an
`<hf-audio-group>` element with that id and the group becomes a real submix bus:
one chain, one fader, one automation clock for every member.
```html
<hf-audio-group
id="voiceover"
data-label="Voiceover"
data-volume="0.9"
data-fx-chain='{"version":1,"nodes":[
{"type":"compressor","id":"g1","params":{"threshold":-18,"ratio":3}},
{"type":"peaking","id":"g2","params":{"frequency":3000,"gain":2,"q":1}}]}'
></hf-audio-group>
<audio id="vo-intro" data-audio-group="voiceover" …></audio>
<audio id="vo-middle" data-audio-group="voiceover" …></audio>
```
**Reach for the bus when the same treatment belongs on several tracks.** Four
narration clips that each want the same compressor is four chains to keep in
step, and they drift the moment one is edited; on the bus it is one chain, and
the compressor sees the whole voice rather than each clip in isolation — which is
the point, since a compressor cannot ride a sequence it only hears a third of.
Per-clip chains remain right for what is genuinely per-clip: one noisy take that
needs its own de-esser.
| On the bus | Does |
| ----------------- | ----------------------------------------- |
| `data-fx-chain` | one chain over the summed members |
| `data-automation` | envelopes on the bus, in COMPOSITION time |
| `data-volume` | one fader for every member (default 1) |
| `data-label` | the display name; falls back to the id |
| `data-hidden` | drops every member from the mix |
**Group automation is composition time, not clip time.** A bus has no
`data-start` — members are already at their composition positions when they
reach it — so `t: 0` in a group lane is the start of the composition, not of any
clip. A lane on a clip is clip-local; the same numbers mean different instants on
the two, which is the one thing to get right when moving an envelope from a clip
up onto its bus.
**A carve stays on the clip.** `data-fx-carve` is not a group attribute. The bed
being carved is a single track, and it is that track which carries
`data-fx-carve` — pointed AT a group, per the rule above. Group and carve meet in
`sources`, not on one element. A carve written onto a bus is half an effect
applied twice: the level half measures the bed's own audio, which a bus has none
of, so only the filters survive — and a bus and its members are one signal path,
so the bed then runs through the bus's filters AND its own. The
`audio_group_carve_attr` lint rule catches it.
**One clip is not a bus.** A group exists to give several tracks one chain, one
fader and one clock. Wrapping a single clip in a bus buys nothing the clip's own
`data-fx-chain` does not already do, and it doubles the places a later edit has
to land. The one reason to do it anyway: a bus's automation clock is composition
time, so a single-member bus is how a lane on that clip gets composition-time
timing.
**One knob.** `strength` is 0..1 and derives everything: how deep to cut, how
many bands, how wide, how far to favour intelligibility over raw voice energy,
how far the level may drop, how far under the voice to aim. Those six move

4
skills/hyperframes-audio/references/attributes.md
View File

@ -2,6 +2,10 @@
All three go on the `<audio>` / `<video>` element itself, JSON-encoded, so a
composition carries its whole mix in the HTML with nothing to load beside it.
`data-fx-chain` and `data-automation` also go on an `<hf-audio-group>` bus,
where they mean the same thing over the summed members — with one difference
worth knowing: a group's automation runs on COMPOSITION time, since a bus has no
`data-start` of its own. `data-fx-carve` is clip-only; a bus has no carve.
Nothing static validates them: preview plays an unreadable chain dry to stay
workable, and the render refuses the whole mix rather than shipping a dry track
that sounds plausible and is wrong.

18
skills/hyperframes/SKILL.md
View File

@ -92,21 +92,21 @@ Use the bare name without `/`. If the command fails, surface the error; do not r
| Seek-safe GSAP, CSS, Anime.js, WAAPI, FLIP, paths, masks, SVG, 3D keyframes, or `hyperframes keyframes` diagnostics | `/hyperframes-keyframes` |
| Design specs, concept, palette, typography, narration, beat planning | `/hyperframes-creative` |
| Images, icons, logos, audio, captions, grades, LUTs, reusable media | `/media-use` |
| Voiceover carve, audio effect chains, or automation envelopes on a track | `/hyperframes-audio` |
| Voiceover carve, audio effect chains, automation envelopes, or one chain/fader across several tracks (submix bus) | `/hyperframes-audio` |
| Init, lint, check, snapshots, compare, batch render, Studio, render, publish, or diagnostics | `/hyperframes-cli` |
| Registry blocks and components | `/hyperframes-registry` |
| Figma assets, tokens, components, or storyboard frames as reconstructed motion | `/figma` |
Creator edit phrases are cross-domain requests. Load every skill named in the matching row:
| Creator request | Required domains |
| ------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| “cut this footage”, hard cut, trim, splice, reorder, or use a source range | `/general-video` + `/hyperframes-core`; core owns `data-start`, `data-duration`, `data-media-start`, and track layout. |
| zoom in here, punch-in / punch-out, smooth multi-state zoom or reframe, Ken Burns, or camera move | `/general-video` + `/hyperframes-core` + `/hyperframes-keyframes`; animate the inner visual/crop wrapper, not the timed clip. |
| match cut or whip pan camera transition | `/general-video` + `/hyperframes-animation` + `/hyperframes-keyframes` + `/hyperframes-registry`; search/install a transition primitive before hand-authoring. |
| fade, crossfade, track gain/volume, automation, duck/carve, or audio effects | `/general-video` + `/hyperframes-core` + `/hyperframes-audio`; core places clips, audio mixes placed tracks. |
| picture and sound edits that combine cuts with camera motion or mixing | `/general-video` + `/hyperframes-core` + `/hyperframes-keyframes` when there is visual motion + `/hyperframes-audio` when sound is faded, mixed, ducked, automated, or processed. |
| source or generate media, or preprocess an unsupported speed ramp/mid-source freeze | `/media-use`; sourcing/generation/preprocessing only, never placed-track mixing. |
| Creator request | Required domains |
| -------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| “cut this footage”, hard cut, trim, splice, reorder, or use a source range | `/general-video` + `/hyperframes-core`; core owns `data-start`, `data-duration`, `data-media-start`, and track layout. |
| zoom in here, punch-in / punch-out, smooth multi-state zoom or reframe, Ken Burns, or camera move | `/general-video` + `/hyperframes-core` + `/hyperframes-keyframes`; animate the inner visual/crop wrapper, not the timed clip. |
| match cut or whip pan camera transition | `/general-video` + `/hyperframes-animation` + `/hyperframes-keyframes` + `/hyperframes-registry`; search/install a transition primitive before hand-authoring. |
| fade, crossfade, track gain/volume, automation, duck/carve, audio effects, or one effect across several tracks | `/general-video` + `/hyperframes-core` + `/hyperframes-audio`; core places clips, audio mixes placed tracks — including a submix bus over a group of them. |
| picture and sound edits that combine cuts with camera motion or mixing | `/general-video` + `/hyperframes-core` + `/hyperframes-keyframes` when there is visual motion + `/hyperframes-audio` when sound is faded, mixed, ducked, automated, or processed. |
| source or generate media, or preprocess an unsupported speed ramp/mid-source freeze | `/media-use`; sourcing/generation/preprocessing only, never placed-track mixing. |
Constant `data-playback-rate` is render-safe for picture and pitch-preserved
sound. It does not make source speed ramps keyframeable; preprocess ramps.