fix: proper radio buttons for VAD mode, standard=16ms/aggressive=10ms

- Use compound-web Form/InlineField/RadioControl/Label/HelpMessage for
  VAD mode selection (proper radio button rendering)
- Standard mode: 256 samples / 16 ms hop + 5 ms open / 20 ms close ramp
- Aggressive mode: 160 samples / 10 ms hop + 1 ms open / 5 ms close ramp
- Worklet stores WebAssembly.Module and recreates TenVADRuntime with the
  correct hop size whenever the mode changes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/livekit/NoiseGateProcessor.worklet.ts

@@ -218,13 +218,16 @@ class NoiseGateProcessor extends AudioWorkletProcessor {
   private vadEnabled = false;
   private vadPositiveThreshold = 0.5;
   private vadNegativeThreshold = 0.3;
+  private vadAggressive = false;
   private tenVadRuntime: TenVADRuntime | null = null;
+  private tenVadModule: WebAssembly.Module | undefined = undefined;
   // 3:1 decimation from AudioContext sample rate to 16 kHz
   private readonly decRatio = Math.max(1, Math.round(sampleRate / 16000));
   private decPhase = 0;
   private decAcc = 0;
-  // 160-sample hop = 10 ms @ 16 kHz (minimum supported by TEN-VAD)
-  private readonly vadHopBuf = new Int16Array(160);
+  // Buffer sized for max hop (256); vadHopSize tracks how many samples to collect
+  private readonly vadHopBuf = new Int16Array(256);
+  private vadHopSize = 256; // standard: 256 (16 ms), aggressive: 160 (10 ms)
   private vadHopCount = 0;
 
   private logCounter = 0;
@@ -235,13 +238,13 @@ class NoiseGateProcessor extends AudioWorkletProcessor {
     super(options);
 
     // Try to instantiate TEN-VAD from the pre-compiled module passed by the main thread
-    const tenVadModule = options?.processorOptions?.tenVadModule as
+    this.tenVadModule = options?.processorOptions?.tenVadModule as
       | WebAssembly.Module
       | undefined;
-    if (tenVadModule) {
+    if (this.tenVadModule) {
       try {
-        // hopSize = 160 samples @ 16 kHz = 10 ms; threshold = 0.5 (overridden via params)
-        this.tenVadRuntime = new TenVADRuntime(tenVadModule, 160, 0.5);
+        // Default: standard mode — 256 samples @ 16 kHz = 16 ms
+        this.tenVadRuntime = new TenVADRuntime(this.tenVadModule, 256, 0.5);
         this.port.postMessage({
           type: "log",
           msg: "[NoiseGate worklet] TEN-VAD runtime initialized, decRatio=" + this.decRatio,
@@ -297,13 +300,28 @@ class NoiseGateProcessor extends AudioWorkletProcessor {
     this.vadEnabled = p.vadEnabled ?? false;
     this.vadPositiveThreshold = p.vadPositiveThreshold ?? 0.5;
     this.vadNegativeThreshold = p.vadNegativeThreshold ?? 0.3;
-    if (p.vadAggressive) {
+    const newAggressive = p.vadAggressive ?? false;
+    if (newAggressive) {
       this.vadOpenRampRate  = 1.0 / (0.001 * sampleRate); // 1 ms — near-instant
       this.vadCloseRampRate = 1.0 / (0.005 * sampleRate); // 5 ms
     } else {
       this.vadOpenRampRate  = 1.0 / (0.005 * sampleRate); // 5 ms
       this.vadCloseRampRate = 1.0 / (0.02  * sampleRate); // 20 ms
     }
+    // Recreate runtime if mode changed (hop size differs between standard/aggressive)
+    const newHopSize = newAggressive ? 160 : 256;
+    if (newAggressive !== this.vadAggressive && this.tenVadModule) {
+      this.tenVadRuntime?.destroy();
+      this.tenVadRuntime = null;
+      this.vadHopCount = 0;
+      try {
+        this.tenVadRuntime = new TenVADRuntime(this.tenVadModule, newHopSize, 0.5);
+      } catch (e) {
+        this.port.postMessage({ type: "log", msg: "[NoiseGate worklet] TEN-VAD recreate failed: " + String(e) });
+      }
+    }
+    this.vadAggressive = newAggressive;
+    this.vadHopSize = newHopSize;
     // When VAD is disabled, open the gate immediately
     if (!this.vadEnabled) this.vadGateOpen = true;
     this.port.postMessage({
@@ -396,7 +414,7 @@ class NoiseGateProcessor extends AudioWorkletProcessor {
                 : (avg * 32767 + 0.5) | 0;
           this.vadHopBuf[this.vadHopCount++] = s16;
 
-          if (this.vadHopCount >= 160) {
+          if (this.vadHopCount >= this.vadHopSize) {
             this.vadHopCount = 0;
             const prob = this.tenVadRuntime.process(this.vadHopBuf);
             if (!this.vadGateOpen && prob >= this.vadPositiveThreshold) {

src/settings/SettingsModal.tsx

@@ -5,10 +5,19 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE in the repository root for full details.
 */
 
-import { type ChangeEvent, type FC, type ReactNode, useEffect, useState, useCallback } from "react";
+import { type ChangeEvent, type FC, type ReactNode, useEffect, useId, useState, useCallback } from "react";
 import { useTranslation } from "react-i18next";
 import { type MatrixClient } from "matrix-js-sdk";
-import { Button, Heading, Root as Form, Separator } from "@vector-im/compound-web";
+import {
+  Button,
+  Heading,
+  HelpMessage,
+  InlineField,
+  Label,
+  RadioControl,
+  Root as Form,
+  Separator,
+} from "@vector-im/compound-web";
 import { type Room as LivekitRoom } from "livekit-client";
 
 import { Modal } from "../Modal";
@@ -134,6 +143,7 @@ export const SettingsModal: FC<Props> = ({
   const [showAdvancedGate, setShowAdvancedGate] = useState(false);
 
   // Voice activity detection
+  const vadModeRadioGroup = useId();
   const [vadActive, setVadActive] = useSetting(vadEnabledSetting);
   const [vadModeValue, setVadModeValue] = useSetting(vadModeSetting);
   const [vadPositiveThreshold, setVadPositiveThreshold] = useSetting(vadPositiveThresholdSetting);
@@ -347,28 +357,34 @@ export const SettingsModal: FC<Props> = ({
           </FieldRow>
           {vadActive && (
             <>
-              <FieldRow>
-                <InputField
-                  id="vadModeStandard"
-                  type="radio"
-                  name="vadMode"
-                  label="Standard"
-                  description="5 ms open / 20 ms close ramp — comfortable feel."
+              <Form>
+                <InlineField
+                  name={vadModeRadioGroup}
+                  control={
+                    <RadioControl
                       checked={vadModeValue === "standard"}
+                      value="standard"
                       onChange={(): void => setVadModeValue("standard")}
                     />
-              </FieldRow>
-              <FieldRow>
-                <InputField
-                  id="vadModeAggressive"
-                  type="radio"
-                  name="vadMode"
-                  label="Aggressive"
-                  description="1 ms open / 5 ms close ramp — lowest possible latency."
+                  }
+                >
+                  <Label>Standard</Label>
+                  <HelpMessage>256 samples / 16 ms — comfortable feel.</HelpMessage>
+                </InlineField>
+                <InlineField
+                  name={vadModeRadioGroup}
+                  control={
+                    <RadioControl
                       checked={vadModeValue === "aggressive"}
+                      value="aggressive"
                       onChange={(): void => setVadModeValue("aggressive")}
                     />
-              </FieldRow>
+                  }
+                >
+                  <Label>Aggressive</Label>
+                  <HelpMessage>160 samples / 10 ms — lowest possible latency.</HelpMessage>
+                </InlineField>
+              </Form>
               <div className={`${styles.volumeSlider} ${styles.thresholdSlider}`}>
                 <span className={styles.sliderLabel}>Open threshold: {Math.round(vadPositiveThresholdRaw * 100)}%</span>
                 <p>How confident the model must be before opening the gate.</p>