feat(studio): automate and un-automate each effect parameter - #3026
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The per-parameter surface in the FX panel. An automated parameter's control is disabled — a value typed there would be overwritten by the envelope on the next tick, so the lane is the value now — and the toggle beside it adds or deletes that parameter's lane. Adding seeds the lane with a single point at the value the control already holds, so switching to an envelope never changes the sound, only where the value comes from. Parameters no envelope can drive have no toggle at all: the worklet-backed dynamics expose no AudioParams, a WaveShaper's curve and a convolution impulse are rebuilt wholesale rather than scheduled. Neither does a chain node with no id, since a lane addresses nodes by id — so adding an effect now mints one. Carve moves onto the same non-reloading write, and decodes its source in an `OfflineAudioContext`: opening a second output device mid-playback makes the running track glitch while the hardware is reconfigured. Turning carve off now also drops the filters it generated, which otherwise kept dipping the bed with nothing in the panel to explain it. `AudioFxGroup` moves into its own module — PropertyPanelFlat was at its size budget — which also gave the panel's write behaviour somewhere to be tested: what it writes, seeded at the current value, preserving the lanes it is not touching, and clearing the attribute when the last one goes. 🤖 Generated with [Claude Code](https://claude.com/claude-code)
…ve against Carve is a relationship between two tracks — it analyses another track's voice and dips this bed where that voice sits. In a composition with a single audio track there is nothing to listen to, so the block offered an empty source picker and an Analyse button that could never do anything. It is now shown only when the composition holds another audio track, and still shown when carve is already configured: hiding a live setting because its voice track was removed would leave the bed being dipped from out of sight. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The panel derives carve's source list from the selected element's document, so a selection with no element has no sources — which the new visibility rule correctly reads as 'nothing to carve against'. The suite mounted exactly that, so it was asserting on a hidden block. Selections now carry a real <audio> with a sibling track, and the two cases the rule exists for are pinned directly. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Three writes in the audio panel each read the source file, mutate one attribute and write it back. Fired without ordering they read the same content and the last one lands, dropping the others. - Deleting an effect left its automation lanes in the attribute. Ids are minted lowest-free, so the next effect added took the same id and inherited the dead envelope: disabled and "Automated" without the author ever automating it, and baked into the render. - Switching carve off wrote the chain (dropping the filters it generated) and the carve settings at once, so either the filters stayed with no carve to explain them or the settings survived with no filters. - The three carve dials committed per input event, patching the source and resyncing the selection dozens of times per drag. They now preview live and persist on release, like the FX knobs already do. Volume automation reads through the quiet commit too, so removing a lane resyncs the panel instead of leaving the slider disabled.
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