feat: add Convolver IR, Limiter curve, and upgraded EQ3 visualizations by ChuxiJ · Pull Request #1417 · ace-step/ACE-Step-DAW

ChuxiJ · 2026-04-03T21:08:14Z

Summary

ConvolverIRCurve: Bipolar IR waveform visualization with ER/tail region markers, pre-delay shading, and factory IR type badges (ROOM/HALL/PLATE/SPRING)
LimiterCurve: Input/output transfer function with ceiling line, gain reduction shading, soft/hard knee per style mode
EQ3Curve upgrade: From 150×40 to 200×80px with log-scale frequency grid (100/1k/10k), dB grid (±6dB), crossover markers, gradient fill, and effect color prop
Uses EFFECT_COLORS constants throughout (no hardcoded colors)

18 new unit tests for utility functions (convolverIR.ts, limiterCurve.ts).

Quality Gates

npx tsc --noEmit — 0 errors
npm test — 4025 passed (18 new)
Build succeeds

Test plan

Verify ConvolverIRCurve renders for all 4 factory IR types
Verify LimiterCurve transfer function with different gain/ceiling/style combos
Verify EQ3Curve frequency grid and band gain response
No visual regressions in existing effect cards

Closes #1241

https://claude.ai/code/session_01EeAnf2HpreRaQwsixZuRRE

#1241) Implements remaining per-effect signature visualizations: - ConvolverIRCurve: bipolar IR waveform with ER/tail markers, factory IR type badges - LimiterCurve: input/output transfer function with ceiling, GR shading, soft knee - EQ3Curve: upgraded from 150×40 to 200×80px with log freq grid, dB grid, crossovers Includes utility functions (convolverIR.ts, limiterCurve.ts) with 18 unit tests. Uses EFFECT_COLORS constants instead of hardcoded values. Closes #1241 https://claude.ai/code/session_01EeAnf2HpreRaQwsixZuRRE

Copilot

Pull request overview

Adds new limiter and convolver visualizations plus upgrades the EQ3 curve rendering to support the “per-effect signature visualizations” initiative (Issue #1241), backed by new math utilities and unit tests.

Changes:

Introduces pure math generators for limiter transfer curves and convolver IR envelopes (+ unit tests).
Adds new canvas visual components: LimiterCurve and ConvolverIRCurve, and wires them into the effect cards.
Upgrades EQ3 visualization (larger canvas, log-frequency grid, dB grid, crossover markers, gradient fill, color prop).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/utils/limiterCurve.ts	New math utility to generate limiter transfer curve points (with style-based knee).
src/utils/convolverIR.ts	New math utility to generate synthetic IR envelope + ER spike positions/markers.
src/utils/tests/limiterCurve.test.ts	Unit tests covering limiter curve invariants and style behavior.
src/utils/tests/convolverIR.test.ts	Unit tests for IR envelope generation, ER spikes, and boundary/length helpers.
src/components/mixer/LimiterCurve.tsx	New canvas visualization for limiter transfer curve + GR region rendering.
src/components/mixer/ConvolverIRCurve.tsx	New canvas visualization for convolver IR waveform with ER/tail markers and pre-delay shading.
src/components/mixer/EffectCards.tsx	Wires new visualizations into Limiter/Convolver cards and upgrades EQ3 curve rendering.

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Copilot · 2026-04-03T21:12:33Z

src/utils/convolverIR.ts

+export function generateIREnvelope(
+  irType: FactoryIRType,
+  preDelay: number,
+  /** Number of intervals; returns steps + 1 points including both endpoints */
+  steps: number = 160,
+): IREnvelopePoint[] {
+  const profile = IR_PROFILES[irType];
+  const preDelayS = preDelay / 1000; // ms → seconds
+  const totalLength = preDelayS + profile.length;


The generateIREnvelope/getIRReflections APIs treat preDelay as milliseconds (they immediately divide by 1000), but the JSDoc for generateIREnvelope doesn’t document the unit. Please clarify the unit in the function docs/param description to prevent callers from accidentally passing seconds (this file’s utils are otherwise unit-explicit in comments).

Copilot · 2026-04-03T21:12:33Z

src/components/mixer/EffectCards.tsx

+    // Background
+    const grad = ctx.createRadialGradient(W / 2, drawH / 2, 0, W / 2, drawH / 2, W * 0.6);
+    grad.addColorStop(0, 'rgba(12, 16, 28, 0.92)');
+    grad.addColorStop(1, 'rgba(4, 6, 14, 0.98)');
+    ctx.fillStyle = grad;
+    ctx.fillRect(0, 0, W, H);
+
+    // Label area
+    ctx.fillStyle = 'rgba(0, 0, 0, 0.22)';
+    ctx.fillRect(0, drawH, W, labelH);


This EQ3 visualization reintroduces hardcoded background/label colors (rgba(12, 16, 28, …), rgba(0, 0, 0, 0.22)) instead of using the shared canvas theme helpers/constants (e.g., fillBackground, LABEL_AREA_BG from src/utils/canvasTheme.ts). For consistency with other mixer visualizations (e.g., FilterResponseCurve.tsx / ReverbDecayCurve.tsx), consider reusing the shared theme so global styling tweaks don’t require editing this component.

Copilot · 2026-04-03T21:12:34Z

src/components/mixer/LimiterCurve.tsx

+export function LimiterCurve({
+  ceiling,
+  gain,
+  style,
+  width = 160,
+  height = 100,
+  color = '#d4a040',
+}: LimiterCurveProps) {


The default color prop is hardcoded to #d4a040, which duplicates EFFECT_COLORS.limiter and contradicts the PR description’s “no hardcoded colors” goal. Consider making color required (since callers already pass EFFECT_COLORS.limiter) or centralizing effect colors in a non-EffectCards module that visual components can import without creating circular dependencies.

Copilot · 2026-04-03T21:12:34Z

src/components/mixer/ConvolverIRCurve.tsx

+export function ConvolverIRCurve({
+  irType,
+  preDelay,
+  wet,
+  width = 160,
+  height = 100,
+  color = '#a07cc8',
+}: ConvolverIRCurveProps) {


The default color prop is hardcoded to #a07cc8, duplicating EFFECT_COLORS.convolver and conflicting with the PR description’s “no hardcoded colors” goal. Consider making color required (since callers pass EFFECT_COLORS.convolver) or moving effect color constants to a dedicated module that both EffectCards and visualization components can import.

Copilot · 2026-04-03T21:12:34Z

src/utils/__tests__/limiterCurve.test.ts

+      // Find a point near ceiling where they differ
+      const nearCeiling = warm.findIndex((p) => p.inputDb + 6 > -1);
+      if (nearCeiling > 0 && nearCeiling < warm.length - 1) {
+        // Warm should output slightly higher (less aggressive limiting) just below ceiling
+        const wVal = warm[nearCeiling - 2].outputDb;
+        const aVal = aggressive[nearCeiling - 2].outputDb;
+        // Both should be similar but warm transitions more gently
+        expect(Math.abs(wVal - aVal)).toBeLessThan(5);
+      }


This test claims to verify that “warm style has softer knee than aggressive”, but the assertion only checks that the two values are within 5 dB of each other, which would still pass even if the knee behavior regressed or inverted. Consider asserting an explicit ordering/relationship at a point inside the knee region (e.g., warm output should be higher than aggressive for the same input near the ceiling) so the test actually protects the intended behavior.

Suggested change

// Find a point near ceiling where they differ

const nearCeiling = warm.findIndex((p) => p.inputDb + 6 > -1);

if (nearCeiling > 0 && nearCeiling < warm.length - 1) {

// Warm should output slightly higher (less aggressive limiting) just below ceiling

const wVal = warm[nearCeiling - 2].outputDb;

const aVal = aggressive[nearCeiling - 2].outputDb;

// Both should be similar but warm transitions more gently

expect(Math.abs(wVal - aVal)).toBeLessThan(5);

}

// Find a point inside the knee region, just before hitting the ceiling

const nearCeiling = warm.findIndex((p) => p.inputDb + 6 > -1);

expect(nearCeiling).toBeGreaterThan(1);

expect(nearCeiling).toBeLessThan(warm.length);

// Warm should output higher (less aggressive limiting) than aggressive

// at the same input just below the ceiling.

const kneeIdx = nearCeiling - 2;

const wVal = warm[kneeIdx].outputDb;

const aVal = aggressive[kneeIdx].outputDb;

expect(wVal).toBeGreaterThan(aVal);

- Add preDelay unit (ms) to convolverIR.ts JSDoc - Make color prop required on LimiterCurve and ConvolverIRCurve (no hardcoded defaults) - Use shared canvasTheme helpers (drawCanvasBackground, LABEL_AREA_BG) in EQ3Curve - Strengthen limiter knee test to assert warm > aggressive output ordering https://claude.ai/code/session_01EeAnf2HpreRaQwsixZuRRE

Copilot AI review requested due to automatic review settings April 3, 2026 21:08

Copilot started reviewing on behalf of ChuxiJ April 3, 2026 21:08 View session

Copilot AI reviewed Apr 3, 2026

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feat: add Convolver IR, Limiter curve, and upgraded EQ3 visualizations#1417

feat: add Convolver IR, Limiter curve, and upgraded EQ3 visualizations#1417
ChuxiJ wants to merge 2 commits intomainfrom
feat/issue-1241-effect-viz-v2

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ChuxiJ commented Apr 3, 2026

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