Audio parameter automation

audio.param-automation

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Selected signal results for external comparison. Field statuses, controls and exact values are retained.

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// Test source pending.

Definition

Render scheduled gain trajectories at a-rate and k-rate; reconcile hold cancellation with an equivalent authored history. Evidence only; no detection or hardware attribution.

Find it in the repository

Collector source: core/signals/audio/param-automation.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/audio/param-automation.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: audio.param-automation
Collector: audio.param-automation
API / surface: core/signals/audio/param-automation.ts
Timeout: 2000 ms
Companion signals: None
Fixture inputs: Inline owned corpora (listed below)

core/fixtures/audio/param-automation.ts · sha256:66c41789d7e1d41e4160c6e8a2753be5ee1e4ba40f3dc9600b4042cc62e9999d

Exact request inputs

[
  {
    "key": "audio.param-automation.responses",
    "inputs": {
      "constant": {
        "revision": "param-automation-r1",
        "id": "constant",
        "rate": "a-rate",
        "kind": "constant",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0.5,
            "frame": 0
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "step": {
        "revision": "param-automation-r1",
        "id": "step",
        "rate": "a-rate",
        "kind": "step",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "setValueAtTime",
            "value": 1,
            "frame": 256
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "ramp-a-rate": {
        "revision": "param-automation-r1",
        "id": "ramp-a-rate",
        "rate": "a-rate",
        "kind": "ramp",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "linearRampToValueAtTime",
            "value": 1,
            "frame": 512
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "ramp-k-rate": {
        "revision": "param-automation-r1",
        "id": "ramp-k-rate",
        "rate": "k-rate",
        "kind": "ramp",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "linearRampToValueAtTime",
            "value": 1,
            "frame": 512
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "cancel-hold-a-rate": {
        "revision": "param-automation-r1",
        "id": "cancel-hold-a-rate",
        "rate": "a-rate",
        "kind": "cancel-hold",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "linearRampToValueAtTime",
            "value": 1,
            "frame": 512
          },
          {
            "method": "cancelAndHoldAtTime",
            "value": null,
            "frame": 256
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "cancel-hold-k-rate": {
        "revision": "param-automation-r1",
        "id": "cancel-hold-k-rate",
        "rate": "k-rate",
        "kind": "cancel-hold",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "linearRampToValueAtTime",
            "value": 1,
            "frame": 512
          },
          {
            "method": "cancelAndHoldAtTime",
            "value": null,
            "frame": 256
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "authored-hold-a-rate": {
        "revision": "param-automation-r1",
        "id": "authored-hold-a-rate",
        "rate": "a-rate",
        "kind": "authored-hold",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "linearRampToValueAtTime",
            "value": 0.5,
            "frame": 256
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      },
      "authored-hold-k-rate": {
        "revision": "param-automation-r1",
        "id": "authored-hold-k-rate",
        "rate": "k-rate",
        "kind": "authored-hold",
        "events": [
          {
            "method": "setValueAtTime",
            "value": 0,
            "frame": 0
          },
          {
            "method": "linearRampToValueAtTime",
            "value": 0.5,
            "frame": 256
          }
        ],
        "sampleRate": 48000,
        "frames": 1024,
        "input": "1024 samples of one",
        "tolerance": 0.000002,
        "quantumFallback": "default 128 frames per Web Audio default renderSizeHint"
      }
    },
    "controls": {}
  }
]

One collector runs per invocation. Results and JSON select this signal’s fields; any companions execute in the same collector.

Generated source manifest lists runtime files, fixture URLs and content digests for this build. The Source tab provides a copyable console sample.

Run and edit locally

From the repository root, start the Astro app, then open /signals/audio.param-automation. Edit the collector source and reload the page to load its new build.

pnpm run dev:web

In a browser module served by this repository’s Vite graph:

import { createCollector } from "/core/collect"
import { measurementModule } from "/core/signals/audio/param-automation"

const signal = measurementModule
const collector = createCollector()
const suite = { signals: [signal] }
const result = await collector.collect(suite)

Reuse the collector owner for repeated calls so collection can enforce cleanup. This returns the collector’s raw result; app/signals/projection.ts selects the retained fields shown on this page.

rg -n 'measurementModule' core app tests
pnpm run check
pnpm run test tests/unit/app/focused-projection.test.ts