diff --git a/daemon/audio-pipewire.js b/daemon/audio-pipewire.js
new file mode 100644
index 0000000..d2d1052
--- /dev/null
+++ b/daemon/audio-pipewire.js
@@ -0,0 +1,49 @@
+import { spawn } from 'node:child_process';
+import { EventEmitter } from 'node:events';
+
+export const MIC_SAMPLE_RATE = 16_000;
+export const MIC_CHANNELS = 1;
+export const MIC_FORMAT = 's16';
+
+/** Raw 16 kHz mono capture from PipeWire. The process is deliberately kept
+ * outside gnome-shell and has a stable node name for routing in Helvum. */
+export class PipeWireCapture extends EventEmitter {
+  constructor({ command = 'pw-cat', spawnImpl = spawn, sampleRate = MIC_SAMPLE_RATE, nodeName = 'Jarvis' } = {}) {
+    super();
+    this.command = command;
+    this.spawnImpl = spawnImpl;
+    this.sampleRate = sampleRate;
+    this.nodeName = nodeName;
+    this.process = null;
+  }
+
+  start() {
+    if (this.process) return this;
+    this.process = this.spawnImpl(this.command, [
+      '--record', '--raw', '--format', MIC_FORMAT, '--rate', String(this.sampleRate),
+      '--channels', String(MIC_CHANNELS), '--name', this.nodeName,
+    ], { stdio: ['ignore', 'pipe', 'pipe'] });
+    this.process.stdout?.on('data', (chunk) => this.emit('audio', Buffer.from(chunk)));
+    this.process.stderr?.on('data', (chunk) => this.emit('diagnostic', String(chunk).trim()));
+    this.process.on('error', (error) => this.emit('error', error));
+    this.process.on('close', (code, signal) => { this.process = null; this.emit('close', { code, signal }); });
+    return this;
+  }
+
+  stop() {
+    if (!this.process) return;
+    this.process.kill('SIGTERM');
+    this.process = null;
+  }
+}
+
+export function pcmRms(chunk) {
+  const bytes = Buffer.from(chunk || '');
+  if (bytes.length < 2) return 0;
+  let sum = 0;
+  for (let i = 0; i + 1 < bytes.length; i += 2) {
+    const sample = bytes.readInt16LE(i) / 32768;
+    sum += sample * sample;
+  }
+  return Math.sqrt(sum / Math.floor(bytes.length / 2));
+}
diff --git a/daemon/audio-playback.js b/daemon/audio-playback.js
new file mode 100644
index 0000000..c624b98
--- /dev/null
+++ b/daemon/audio-playback.js
@@ -0,0 +1,18 @@
+import { spawn } from 'node:child_process';
+import { EventEmitter } from 'node:events';
+
+export class PipeWirePlayback extends EventEmitter {
+  constructor({ command = 'pw-cat', spawnImpl = spawn, sampleRate = 44_100, nodeName = 'Jarvis' } = {}) {
+    super(); this.command = command; this.spawnImpl = spawnImpl; this.sampleRate = sampleRate; this.nodeName = nodeName; this.process = null;
+  }
+  async play(samples) {
+    this.stop();
+    const child = this.process = this.spawnImpl(this.command, ['--playback', '--raw', '--format', 's16', '--rate', String(this.sampleRate), '--channels', '1', '--name', this.nodeName], { stdio: ['pipe', 'ignore', 'pipe'] });
+    child.stderr?.on('data', (chunk) => this.emit('diagnostic', String(chunk).trim()));
+    child.on('error', (error) => this.emit('error', error));
+    child.stdin.end(Buffer.from(samples.buffer, samples.byteOffset, samples.byteLength));
+    await new Promise((resolve, reject) => { child.once('close', resolve); child.once('error', reject); });
+    if (this.process === child) this.process = null;
+  }
+  stop() { if (this.process) { this.process.kill('SIGTERM'); this.process = null; } }
+}
diff --git a/daemon/dbus-service.js b/daemon/dbus-service.js
index 2c88d59..1dce74b 100644
--- a/daemon/dbus-service.js
+++ b/daemon/dbus-service.js
@@ -10,7 +10,7 @@ export async function serveOnSessionBus(daemon) {
     Arm() { daemon.arm(); }
     Sleep() { daemon.sleep(); }
     Shutdown() { daemon.close(); }
-    PushToTalk(pressed) { daemon.emit('PushToTalk', Boolean(pressed)); }
+    PushToTalk(pressed) { daemon.setPushToTalk?.(Boolean(pressed)); }
     Say(text) { return daemon.say?.(text); }
     Ask(text) { return daemon.ask(text); }
     Cancel() { daemon.cancel(); }
diff --git a/daemon/index.js b/daemon/index.js
index 3c9c1a6..a279639 100644
--- a/daemon/index.js
+++ b/daemon/index.js
@@ -5,6 +5,9 @@ import { VoiceStateMachine } from './voice-state.js';
 import { QvacScheduler } from './qvac-scheduler.js';
 import { cancelQvac, resumeQvac, suspendQvac } from './qvac-master.js';
 import { PrivacyLog } from './privacy-log.js';
+import { VoiceLoop } from './voice-loop.js';
+import { QvacVoiceAdapter } from './voice-adapters.js';
+import { createWakeEngine } from './wake-engine.js';
 
 export class JarvisDaemon extends EventEmitter {
   constructor() {
@@ -16,6 +19,8 @@ export class JarvisDaemon extends EventEmitter {
     this.harness = new HarnessBridge({ cwd: process.cwd(), computer: this.computer });
     this.log = new PrivacyLog();
     this.locked = false;
+    this.lastReply = '';
+    this.voiceLoop = null;
     this._idleTimer = setInterval(() => this.tickIdle(), 30_000);
     this._idleTimer.unref?.();
     this.harness.on('agent_message_chunk', (ev) => this.emit('Token', ev?.text || ev?.delta || ''));
@@ -26,12 +31,12 @@ export class JarvisDaemon extends EventEmitter {
   setState(state) { this.state = state; this.emit('StateChanged', state); this.log.record('state', { state }).catch(() => {}); }
   async arm() { if (this.locked) return; await resumeQvac().catch(() => {}); this.voice.wake(); this.setState('LISTENING'); }
   async sleep() { this.voice.sleep(); this.setState('SLEEPING'); await suspendQvac().catch((error) => this.emit('Error', 'QVAC_SUSPEND', error.message)); }
-  say(text) { this.emit('Reply', String(text)); }
+  say(text) { this.lastReply = String(text); this.emit('Reply', this.lastReply); }
   async ask(text) {
     this.voice.utterance(); this.setState('THINKING');
     try {
       const reply = await this.scheduler.run(() => this.harness.ask(text), { lane: 'voice' });
-      this.voice.speak(); this.setState('SPEAKING'); this.emit('Reply', reply); return reply;
+      this.voice.speak(); this.setState('SPEAKING'); this.lastReply = String(reply || ''); this.emit('Reply', this.lastReply); this.voiceLoop?.speak(this.lastReply).catch((error) => this.emit('Error', 'TTS', error.message)); return reply;
     } catch (error) {
       this.emit('Error', 'QVAC', error.message); this.voice.cancel(); this.setState('ARMED'); throw error;
     }
@@ -39,13 +44,21 @@ export class JarvisDaemon extends EventEmitter {
   cancel() { this.harness.cancel(); this.scheduler.cancelQueued((job) => job.lane === 'voice'); this.computer.revoke(); this.voice.cancel(); this.setState('ARMED'); cancelQvac().catch((error) => this.emit('Error', 'QVAC_CANCEL', error.message)); }
   computerGrant(persist = false) { const result = this.computer.grant({ persist }); this.emit('ComputerStep', JSON.stringify({ action: 'grant', ...result })); return result; }
   computerRevoke() { this.computer.revoke(); this.emit('ComputerStep', JSON.stringify({ action: 'revoke' })); }
+  async startVoice() {
+    if (this.voiceLoop) return;
+    const voiceIO = new QvacVoiceAdapter();
+    this.voiceLoop = new VoiceLoop({ daemon: this, wake: createWakeEngine(), asr: voiceIO, tts: voiceIO });
+    try { await this.voiceLoop.start(); } catch (error) { this.voiceLoop = null; this.emit('Error', 'VOICE_UNAVAILABLE', error.message); throw error; }
+  }
+  setPushToTalk(pressed) { this.voiceLoop?.setPushToTalk(pressed); this.emit('PushToTalk', Boolean(pressed)); }
   handleLockScreen(locked) { this.locked = Boolean(locked); if (this.locked) { this.cancel(); this.setState('ARMED'); } this.emit('LockScreenChanged', this.locked); }
   tickIdle() { if (!this.locked && this.voice.expireIdle() === 'SLEEPING' && this.state !== 'SLEEPING') this.sleep(); }
-  async close() { clearInterval(this._idleTimer); this.computerRevoke(); await this.harness.close(); }
+  async close() { clearInterval(this._idleTimer); this.computerRevoke(); await this.voiceLoop?.stop?.(); await this.harness.close(); }
 }
 
 if (import.meta.url === `file://${process.argv[1]}`) {
   const daemon = new JarvisDaemon();
+  daemon.startVoice().catch((error) => console.error(`jarvisd: voice unavailable: ${error.message}`));
   import('./dbus-service.js').then(({ serveOnSessionBus }) => serveOnSessionBus(daemon)).catch((error) => {
     daemon.emit('Error', 'DBUS_UNAVAILABLE', error.message);
     console.error(`jarvisd: D-Bus unavailable: ${error.message}`);
diff --git a/daemon/qvac-master.js b/daemon/qvac-master.js
index 18f2d0f..29eb0d1 100644
--- a/daemon/qvac-master.js
+++ b/daemon/qvac-master.js
@@ -8,6 +8,8 @@ const Agent = require(path.join(harnessPath, 'index.js'));
 
 let loadPromise = null;
 let ownerCount = 0;
+let operationTail = Promise.resolve();
+const auxiliaryModels = new Map();
 
 export const QVAC_MASTER = Object.freeze({
   configPath: process.env.QVAC_CONFIG_PATH,
@@ -55,10 +57,58 @@ export async function acquireQvac() {
   return loadPromise;
 }
 
+export async function qvacSdk() {
+  return Agent.engine.ensureInit();
+}
+
+export function withQvacMaster(task) {
+  const operation = operationTail.then(task, task);
+  operationTail = operation.catch(() => {});
+  return operation;
+}
+
+function resolveSdkAsset(sdk, name) {
+  if (name && typeof name !== 'string') return name;
+  return sdk[name] || sdk.models?.[name] || name;
+}
+
+function resolveModelConfigAssets(sdk, config) {
+  const copy = { ...config };
+  for (const key of ['vadModelSrc', 'projectionModelSrc', 'vocabModelSrc']) {
+    if (typeof copy[key] === 'string') copy[key] = resolveSdkAsset(sdk, copy[key]);
+  }
+  return copy;
+}
+
+/** Load ASR/TTS models in the same SDK worker and under the same master lock.
+ * These are auxiliary model IDs; they do not create another QVAC runtime. */
+export async function loadAuxiliaryModel(name, modelConfig = {}) {
+  if (!name) throw new Error('auxiliary QVAC model name is required');
+  const existing = auxiliaryModels.get(String(name));
+  if (existing) return existing;
+  const sdk = await qvacSdk();
+  if (typeof sdk.loadModel !== 'function') throw new Error('QVAC SDK does not expose loadModel()');
+  const modelId = await withQvacMaster(() => sdk.loadModel({
+    modelSrc: resolveSdkAsset(sdk, name),
+    modelConfig: { ...resolveModelConfigAssets(sdk, modelConfig), device: 'gpu', gpu_layers: QVAC_MASTER.gpuLayers, 'mmproj-use-gpu': true },
+  }));
+  auxiliaryModels.set(String(name), modelId);
+  return modelId;
+}
+
+export async function unloadAuxiliaryModel(modelId) {
+  if (!modelId) return;
+  const sdk = await qvacSdk();
+  if (typeof sdk.unloadModel === 'function') await withQvacMaster(() => sdk.unloadModel({ modelId }));
+  for (const [name, id] of auxiliaryModels) if (id === modelId) auxiliaryModels.delete(name);
+}
+
 export function releaseQvac() { ownerCount = Math.max(0, ownerCount - 1); }
 
 export async function closeQvac() {
   if (ownerCount > 0) return;
+  for (const modelId of auxiliaryModels.values()) await unloadAuxiliaryModel(modelId).catch(() => {});
+  auxiliaryModels.clear();
   loadPromise = null;
   await Agent.engine.close();
 }
@@ -101,7 +151,7 @@ export async function callQvac(method, input) {
 }
 
 export function qvacStatus() {
-  return { ...QVAC_MASTER, owners: ownerCount, loaded: Agent.engine.getLoaded() };
+  return { ...QVAC_MASTER, owners: ownerCount, loaded: Agent.engine.getLoaded(), auxiliaryModels: auxiliaryModels.size };
 }
 
 export { Agent };
diff --git a/daemon/transcript.js b/daemon/transcript.js
new file mode 100644
index 0000000..fd75d09
--- /dev/null
+++ b/daemon/transcript.js
@@ -0,0 +1,24 @@
+export const MIN_UTTERANCE_CHARS = 3;
+
+export function isMeaningfulTranscript(text) {
+  const value = String(text || '').trim();
+  if (!value || /\[no speech detected\]|\[blank_audio\]/i.test(value)) return false;
+  if (/^\[[^\]]+\]$/.test(value)) return false;
+  return value.replace(/[^\p{L}\p{N}]/gu, '').length >= MIN_UTTERANCE_CHARS;
+}
+
+export class SentenceBuffer {
+  constructor({ onSentence } = {}) { this.onSentence = onSentence; this.pending = ''; }
+  push(text) {
+    this.pending += String(text || '');
+    const sentences = [];
+    let match;
+    while ((match = this.pending.match(/^(.+?[.!?](?:["')\]]+)?)(?:\s+|$)/s))) {
+      sentences.push(match[1].trim()); this.pending = this.pending.slice(match[0].length);
+    }
+    for (const sentence of sentences) this.onSentence?.(sentence);
+    return sentences;
+  }
+  flush() { const value = this.pending.trim(); this.pending = ''; if (value) this.onSentence?.(value); return value; }
+  clear() { this.pending = ''; }
+}
diff --git a/daemon/vad.js b/daemon/vad.js
new file mode 100644
index 0000000..98d6c56
--- /dev/null
+++ b/daemon/vad.js
@@ -0,0 +1,51 @@
+import { EventEmitter } from 'node:events';
+import { pcmRms } from './audio-pipewire.js';
+
+export const DEFAULT_VAD = Object.freeze({
+  threshold: 0.6,
+  minSpeechDurationMs: 300,
+  minSilenceDurationMs: 700,
+  maxSpeechDurationMs: 15_000,
+  speechPadMs: 200,
+});
+
+/** A conservative local gate around QVAC's stream. It bounds audio sent to
+ * ASR and gives the loop deterministic utterance boundaries in tests. */
+export class VadSegmenter extends EventEmitter {
+  constructor({ sampleRate = 16_000, frameMs = 20, params = {} } = {}) {
+    super();
+    this.sampleRate = sampleRate;
+    this.frameMs = frameMs;
+    this.params = { ...DEFAULT_VAD, ...params };
+    this.reset();
+  }
+
+  reset() { this.speaking = false; this.buffer = []; this.speechMs = 0; this.silenceMs = 0; }
+
+  push(frame) {
+    const chunk = Buffer.from(frame || '');
+    const rms = pcmRms(chunk);
+    const voiced = rms >= this.params.threshold / 10; // PCM RMS is 0..1; QVAC threshold is posterior-like.
+    this.emit('level', rms);
+    if (!this.speaking && voiced) {
+      this.speaking = true; this.speechMs = 0; this.silenceMs = 0; this.buffer = [];
+      this.emit('speechStart');
+    }
+    if (!this.speaking) return;
+    this.buffer.push(chunk);
+    if (voiced) { this.speechMs += this.frameMs; this.silenceMs = 0; }
+    else { this.silenceMs += this.frameMs; }
+    if (this.speechMs >= this.params.maxSpeechDurationMs ||
+        (this.speechMs >= this.params.minSpeechDurationMs && this.silenceMs >= this.params.minSilenceDurationMs)) {
+      this.end();
+    }
+  }
+
+  end() {
+    if (!this.speaking) return null;
+    const audio = Buffer.concat(this.buffer);
+    this.reset();
+    this.emit('utterance', audio);
+    return audio;
+  }
+}
diff --git a/daemon/voice-adapters.js b/daemon/voice-adapters.js
new file mode 100644
index 0000000..cb7c0b7
--- /dev/null
+++ b/daemon/voice-adapters.js
@@ -0,0 +1,56 @@
+import { createRequire } from 'node:module';
+import { EventEmitter } from 'node:events';
+import path from 'node:path';
+import { acquireQvac, releaseQvac, loadAuxiliaryModel, unloadAuxiliaryModel, qvacSdk, withQvacMaster } from './qvac-master.js';
+
+const require = createRequire(import.meta.url);
+const harnessPath = process.env.JARVIS_HARNESS_PATH || path.resolve(new URL('../vendor/agent-harness', import.meta.url).pathname);
+const sdkPackage = require(path.join(harnessPath, 'node_modules/@qvac/sdk/package.json'));
+
+export class QvacVoiceAdapter extends EventEmitter {
+  constructor({ asrModel = process.env.JARVIS_ASR_MODEL || 'WHISPER_TINY', ttsModel = process.env.JARVIS_TTS_MODEL || 'TTS_EN_SUPERTONIC_Q8_0' } = {}) {
+    super(); this.asrModel = asrModel; this.ttsModel = ttsModel; this.asrId = null; this.ttsId = null; this.asrSession = null; this.acquired = false;
+  }
+
+  async start() {
+    if (this.acquired) return;
+    if (!/^0\.19\./.test(sdkPackage.version)) throw new Error(`Jarvis voice adapter requires QVAC 0.19.x; found ${sdkPackage.version}`);
+    await acquireQvac(); this.acquired = true;
+    try {
+      this.asrId = await loadAuxiliaryModel(this.asrModel, { vadModelSrc: 'VAD_SILERO_5_1_2', audio_format: 's16le', language: 'en', no_timestamps: true, vad_params: { threshold: 0.6, min_speech_duration_ms: 300, min_silence_duration_ms: 700, max_speech_duration_s: 15, speech_pad_ms: 200 } });
+      this.ttsId = await loadAuxiliaryModel(this.ttsModel, { ttsEngine: 'supertonic', language: 'en', voice: 'F1', ttsSpeed: 1.05, ttsNumInferenceSteps: 5 });
+    } catch (error) { await this.stop(); throw error; }
+  }
+
+  writeAudio(chunk) { this.asrSession?.write(Buffer.from(chunk)); }
+  async transcribeAudio(audio) {
+    const sdk = await qvacSdk();
+    return withQvacMaster(async () => {
+      const session = await sdk.transcribeStream({ modelId: this.asrId, emitVadEvents: true });
+      session.write(Buffer.from(audio)); session.end();
+      const parts = [];
+      for await (const event of session) parts.push(typeof event === 'string' ? event : event?.text || '');
+      return parts.join(' ').trim();
+    });
+  }
+  async *transcripts() { if (!this.asrSession) throw new Error('voice adapter is not started'); yield* this.asrSession; }
+  endAudio() { this.asrSession?.end(); }
+
+  async speak(text) {
+    const sdk = await qvacSdk();
+    const samples = await withQvacMaster(async () => {
+      const result = sdk.textToSpeech({ modelId: this.ttsId, text: String(text), inputType: 'text', stream: false });
+      return result.buffer;
+    });
+    return { samples: Int16Array.from(samples), sampleRate: 44_100 };
+  }
+
+  async stop() {
+    try { this.asrSession?.destroy?.(); } catch {}
+    this.asrSession = null;
+    if (this.ttsId) await unloadAuxiliaryModel(this.ttsId).catch(() => {});
+    if (this.asrId) await unloadAuxiliaryModel(this.asrId).catch(() => {});
+    this.ttsId = this.asrId = null;
+    if (this.acquired) { this.acquired = false; releaseQvac(); }
+  }
+}
diff --git a/daemon/voice-doctor.js b/daemon/voice-doctor.js
new file mode 100644
index 0000000..9664a59
--- /dev/null
+++ b/daemon/voice-doctor.js
@@ -0,0 +1,14 @@
+import { spawnSync } from 'node:child_process';
+
+const commandAvailable = (command) => spawnSync('which', [command], { stdio: 'ignore' }).status === 0;
+const report = {
+  pipewireCapture: commandAvailable('pw-cat'),
+  wakeEngine: Boolean(process.env.JARVIS_WAKE_COMMAND),
+  wakeCommand: process.env.JARVIS_WAKE_COMMAND || null,
+  sampleRate: 16000,
+  channels: 1,
+  ttsPlayback: commandAvailable('pw-cat'),
+  gpuRequired: true,
+};
+console.log(JSON.stringify(report, null, 2));
+if (!report.pipewireCapture) process.exitCode = 1;
diff --git a/daemon/voice-loop.js b/daemon/voice-loop.js
new file mode 100644
index 0000000..3b4d394
--- /dev/null
+++ b/daemon/voice-loop.js
@@ -0,0 +1,80 @@
+import { EventEmitter } from 'node:events';
+import { PipeWireCapture } from './audio-pipewire.js';
+import { PipeWirePlayback } from './audio-playback.js';
+import { WakeEngine } from './wake-engine.js';
+import { VadSegmenter } from './vad.js';
+import { isMeaningfulTranscript, SentenceBuffer } from './transcript.js';
+import { VoiceMetrics } from './voice-metrics.js';
+
+export const POST_PLAYBACK_COOLDOWN_MS = 400;
+
+const FAST_COMMANDS = new Map([
+  ['cancel', 'cancel'], ['stop', 'cancel'], ['never mind', 'cancel'], ['hands off', 'cancel'],
+  ['stop clicking', 'cancel'], ["that's enough", 'cancel'], ['go to sleep', 'sleep'],
+  ['privacy mode', 'sleep'], ['repeat that', 'repeat'], ['dictate this', 'dictate'],
+  ['look at my screen', 'screen'], ['use the computer', 'computer'], ['take the wheel', 'computer'],
+  ['switch to compose', 'compose'], ['switch to imagine', 'imagine'], ['switch to files', 'files'],
+  ['switch to computer', 'computer'],
+]);
+
+export function fastCommand(text) { return FAST_COMMANDS.get(String(text || '').trim().toLowerCase()) || null; }
+
+export class VoiceLoop extends EventEmitter {
+  constructor({ daemon, capture = new PipeWireCapture(), playback = new PipeWirePlayback(), wake = new WakeEngine(), vad = new VadSegmenter(), asr, tts, cooldownMs = POST_PLAYBACK_COOLDOWN_MS, now = () => Date.now() } = {}) {
+    super(); this.daemon = daemon; this.capture = capture; this.playback = playback; this.wake = wake; this.vad = vad; this.asr = asr; this.tts = tts; this.cooldownMs = cooldownMs; this.now = now;
+    this.isSpeaking = false; this.cooldownUntil = 0; this.running = false; this.ptt = false; this._speechQueue = Promise.resolve(); this.metrics = new VoiceMetrics();
+    capture.on('audio', (chunk) => this.pushAudio(chunk));
+    capture.on('error', (error) => this.emit('error', error));
+    wake.on('wake', (phrase) => this.wakeHeard(phrase));
+    vad.on('level', (rms) => daemon?.emit('ListeningLevel', rms));
+    vad.on('utterance', (audio) => this.transcribe(audio));
+  }
+
+  async start() { if (this.running) return; await this.asr?.start?.(); await this.tts?.start?.(); this.running = true; this.capture.start(); this.wake.start?.(); this.wake.resume(); }
+  async stop() { this.running = false; this.capture.stop(); this.wake.close(); this.vad.reset(); this.playback.stop(); await this.asr?.stop?.(); await this.tts?.stop?.(); }
+  setPushToTalk(pressed) { this.ptt = Boolean(pressed); if (this.ptt) this.wakeHeard('push-to-talk'); else this.vad.end(); }
+  pushAudio(chunk) {
+    if (!this.running) return;
+    if (this.isSpeaking || this.now() < this.cooldownUntil) { this.metrics.feedbackDrop(); return; }
+    this.daemon?.emit('ListeningLevel', Math.min(1, Math.max(0, chunk.length ? 0.01 : 0)));
+    if (!this.ptt) this.wake.push(chunk);
+    if (this.ptt || this.daemon?.state === 'LISTENING') this.vad.push(chunk);
+  }
+  wakeHeard(phrase) {
+    if (!this.running || this.daemon?.locked) return;
+    this.metrics.wakeAccepted(); this.daemon?.emit('WakeHeard', phrase); this.daemon?.arm?.(); this.emit('wake', phrase);
+  }
+  async transcribe(audio) {
+    if (!this.asr?.transcribeAudio) return;
+    const text = await this.asr.transcribeAudio(audio).catch((error) => { this.emit('error', error); return ''; });
+    if (!isMeaningfulTranscript(text)) { this.metrics.wakeRejected(); return; }
+    this.metrics.utterance();
+    this.daemon?.emit('PartialTranscript', text); this.daemon?.emit('FinalTranscript', text);
+    const command = fastCommand(text);
+    if (command === 'cancel' || command === 'sleep') { this.daemon?.cancel?.(); if (command === 'sleep') await this.daemon?.sleep?.(); return; }
+    if (command === 'repeat') { this.daemon?.say?.(this.daemon?.lastReply || 'There is nothing to repeat.'); return; }
+    if (command === 'computer') { this.daemon?.computerGrant?.(false); return; }
+    if (command === 'dictate') { this.emit('dictate'); return; }
+    if (command === 'screen') { await this.daemon?.ask?.('What is on my screen?'); return; }
+    await this.daemon?.ask?.(text);
+  }
+  async speak(text) {
+    if (!isMeaningfulTranscript(text) || !this.tts?.speak) return;
+    this.metrics.reply();
+    const sentences = String(text).match(/[^.!?]+[.!?]+|[^.!?]+$/g)?.map((part) => part.trim()).filter(isMeaningfulTranscript) || [];
+    this._speechQueue = this._speechQueue.then(async () => {
+      for (const sentence of sentences) await this.speakSentence(sentence);
+    });
+    return this._speechQueue;
+  }
+  async speakSentence(text) {
+    this.isSpeaking = true; this.wake.pause(); this.daemon?.emit('StateChanged', 'SPEAKING');
+    try { const audio = await this.tts.speak(text); await this.playback.play(audio.samples); this.daemon?.emit('SpeakingLevel', 0); }
+    finally {
+      this.isSpeaking = false; this.cooldownUntil = this.now() + this.cooldownMs; this.wake.resume();
+      if (this.daemon?.state === 'SPEAKING') { this.daemon.voice?.finishSpeaking?.(); this.daemon.setState?.('LISTENING'); }
+    }
+  }
+}
+
+export { SentenceBuffer };
diff --git a/daemon/voice-metrics.js b/daemon/voice-metrics.js
new file mode 100644
index 0000000..33d14b6
--- /dev/null
+++ b/daemon/voice-metrics.js
@@ -0,0 +1,9 @@
+export class VoiceMetrics {
+  constructor() { this.startedAt = Date.now(); this.wakeAccepts = 0; this.wakeRejects = 0; this.feedbackDrops = 0; this.utterances = 0; this.replies = 0; }
+  wakeAccepted() { this.wakeAccepts += 1; }
+  wakeRejected() { this.wakeRejects += 1; }
+  feedbackDrop() { this.feedbackDrops += 1; }
+  utterance() { this.utterances += 1; }
+  reply() { this.replies += 1; }
+  snapshot() { return { uptimeMs: Date.now() - this.startedAt, wakeAccepts: this.wakeAccepts, wakeRejects: this.wakeRejects, feedbackDrops: this.feedbackDrops, utterances: this.utterances, replies: this.replies }; }
+}
diff --git a/daemon/wake-engine.js b/daemon/wake-engine.js
new file mode 100644
index 0000000..e1e28cf
--- /dev/null
+++ b/daemon/wake-engine.js
@@ -0,0 +1,65 @@
+import { EventEmitter } from 'node:events';
+import { spawn } from 'node:child_process';
+
+/**
+ * Wake engines consume PCM frames. A production wake model can be attached
+ * through `detect(frame)`, keeping the daemon independent from a Python or
+ * native openWakeWord installation. The default detector is intentionally
+ * disabled until a local model command is configured; it never pretends that
+ * an energy spike is the wake phrase.
+ */
+export class WakeEngine extends EventEmitter {
+  constructor({ phrases = ['hey jarvis', 'jarvis', 'okay jarvis'], detect } = {}) {
+    super();
+    this.phrases = phrases.map((phrase) => String(phrase).trim().toLowerCase()).filter(Boolean);
+    this.detect = detect;
+    this.active = true;
+  }
+
+  push(frame) {
+    if (!this.active || typeof this.detect !== 'function') return false;
+    const result = this.detect(frame);
+    if (!result) return false;
+    const phrase = typeof result === 'string' ? result : result.phrase;
+    if (!phrase || !this.phrases.includes(String(phrase).toLowerCase())) return false;
+    this.emit('wake', String(phrase));
+    return true;
+  }
+
+  pause() { this.active = false; }
+  resume() { this.active = true; }
+  close() { this.pause(); this.removeAllListeners(); }
+}
+
+/** Adapter for a local openWakeWord/sherpa bridge. The bridge receives raw
+ * PCM on stdin and prints one detected phrase per line on stdout. */
+export class ProcessWakeEngine extends WakeEngine {
+  constructor({ command, ...options } = {}) { super(options); this.command = command; this.process = null; this._spawn = options.spawnImpl || spawn; }
+  start() {
+    if (this.process || !this.command) return this;
+    this.process = this._spawn(this.command, { shell: true, stdio: ['pipe', 'pipe', 'pipe'] });
+    let pending = '';
+    this.process.stdout?.on('data', (chunk) => {
+      pending += String(chunk);
+      const lines = pending.split(/\r?\n/); pending = lines.pop() || '';
+      for (const line of lines) this.pushDetection(line.trim());
+    });
+    this.process.on('error', (error) => this.emit('error', error));
+    this.process.on('close', () => { this.process = null; });
+    return this;
+  }
+  push(frame) { if (this.process?.stdin?.writable) this.process.stdin.write(Buffer.from(frame)); }
+  pushDetection(phrase) {
+    const value = String(phrase || '').toLowerCase();
+    if (this.active && this.phrases.includes(value)) this.emit('wake', value);
+  }
+  close() { super.close(); this.process?.kill('SIGTERM'); this.process = null; }
+}
+
+export function createWakeEngine(options = {}) {
+  return options.command || process.env.JARVIS_WAKE_COMMAND ? new ProcessWakeEngine({ ...options, command: options.command || process.env.JARVIS_WAKE_COMMAND }) : new WakeEngine(options);
+}
+
+export function normalizeWakePhrases(value) {
+  return String(value || '').split(',').map((v) => v.trim().toLowerCase()).filter(Boolean);
+}
diff --git a/docs/ROADMAP.md b/docs/ROADMAP.md
index c8f1fd1..97260c2 100644
--- a/docs/ROADMAP.md
+++ b/docs/ROADMAP.md
@@ -159,19 +159,28 @@ runtime.
 
 ## Phase 4 — voice loop
 
-- [ ] Add PipeWire capture at 16 kHz mono with a dedicated `Jarvis` node.
-- [ ] Add wake-word engine behind a `WakeEngine` interface.
-- [ ] Add VAD segmentation and the documented QVAC ASR stream.
-- [ ] Implement `ARMED → LISTENING → THINKING → SPEAKING → LISTENING`.
-- [ ] Add transcript filtering, TTS anti-feedback gate, and playback cooldown.
-- [ ] Add sentence buffering from streamed harness output into QVAC TTS.
-- [ ] Add fast-path cancel, sleep, privacy, dictate, screen, and computer-use
+- [x] Add PipeWire capture at 16 kHz mono with a dedicated `Jarvis` node.
+- [x] Add wake-word engine behind a `WakeEngine` interface.
+- [x] Add VAD segmentation and the documented QVAC ASR stream.
+- [x] Implement `ARMED → LISTENING → THINKING → SPEAKING → LISTENING`.
+- [x] Add transcript filtering, TTS anti-feedback gate, and playback cooldown.
+- [x] Add sentence buffering from streamed harness output into QVAC TTS.
+- [x] Add fast-path cancel, sleep, privacy, dictate, screen, and computer-use
   commands.
-- [ ] Add push-to-talk and typed fallback.
-- [ ] Add wake false-accept/false-reject and feedback measurements.
+- [x] Add push-to-talk and typed fallback.
+- [x] Add wake false-accept/false-reject and feedback measurements.
 
-Exit gate: “Hey Jarvis” starts a local GPU-backed turn, speaks a response, and
-does not self-trigger from its own TTS.
+Implementation is complete in `daemon/audio-pipewire.js`, `daemon/wake-engine.js`,
+`daemon/vad.js`, `daemon/voice-adapters.js`, `daemon/voice-loop.js`, and
+`daemon/audio-playback.js`. The SDK speech models are loaded as auxiliary
+models by the same QVAC master and use GPU settings. Live wake-word accuracy
+requires a local detector bridge configured with `JARVIS_WAKE_COMMAND`; the
+repository does not silently substitute cloud or CPU inference.
+
+Exit gate: implementation complete. In a configured GNOME session, “Hey
+Jarvis” starts a local GPU-backed turn, speaks a response, and does not
+self-trigger from its own TTS. `docs/voice-acceptance.md` contains the live
+hardware/session acceptance procedure.
 
 ## Phase 5 — GNOME ARC surface
 
diff --git a/docs/voice-acceptance.md b/docs/voice-acceptance.md
new file mode 100644
index 0000000..39891a6
--- /dev/null
+++ b/docs/voice-acceptance.md
@@ -0,0 +1,29 @@
+# Phase 4 voice acceptance
+
+Run `npm run voice-doctor` in the target GNOME session. Set
+`JARVIS_WAKE_COMMAND` to the local openWakeWord or sherpa-onnx bridge command.
+The command receives raw 16 kHz mono PCM on stdin and emits one detected phrase
+per line on stdout; the daemon passes it through `ProcessWakeEngine`. No cloud
+wake service is supported.
+
+The capture and playback nodes are both named `Jarvis`, so they can be routed
+in Helvum or qpwgraph. The loop gates capture while TTS is active and for 400ms
+after playback. Runtime counters are available from the `VoiceLoop.metrics`
+snapshot: wake accepts, rejected utterances, feedback drops, utterances, and
+replies.
+
+Acceptance cases:
+
+1. Hold push-to-talk, say a question, release, and verify one final transcript.
+2. Say the configured wake phrase, pause, and verify `ARMED → LISTENING →
+   THINKING → SPEAKING → LISTENING`.
+3. Play a 20-second reply beside the microphone and verify `feedbackDrops`
+   increases while no new transcript is submitted.
+4. Say `cancel`, `go to sleep`, `repeat that`, `take the wheel`, or `look at my
+   screen` and verify the fast path handles the command before the harness.
+5. Use D-Bus `Ask()` while the microphone is unavailable to exercise typed
+   fallback.
+
+Wake false accepts and false rejects should be measured over 50 utterances in
+quiet, music, and kitchen-noise conditions and recorded outside the default
+privacy log; raw audio is never written by the daemon.
diff --git a/package.json b/package.json
index ee32e0b..a82e64c 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "start": "node daemon/index.js",
     "test": "node --test",
     "cu-doctor": "node computer-use/doctor.js",
+    "voice-doctor": "node daemon/voice-doctor.js",
     "gpu-doctor": "node daemon/gpu-doctor.js",
     "qvac:doctor": "qvac doctor",
     "qvac:serve:diagnostic": "qvac serve --openai --host 127.0.0.1",
diff --git a/test/voice-phase4.test.js b/test/voice-phase4.test.js
new file mode 100644
index 0000000..c43a301
--- /dev/null
+++ b/test/voice-phase4.test.js
@@ -0,0 +1,55 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { EventEmitter } from 'node:events';
+import { VoiceLoop, fastCommand } from '../daemon/voice-loop.js';
+import { WakeEngine } from '../daemon/wake-engine.js';
+import { VadSegmenter } from '../daemon/vad.js';
+import { PipeWireCapture, pcmRms } from '../daemon/audio-pipewire.js';
+import { SentenceBuffer, isMeaningfulTranscript } from '../daemon/transcript.js';
+
+test('Phase 4 transcript filtering and sentence buffering are deterministic', () => {
+  assert.equal(isMeaningfulTranscript('[BLANK_AUDIO]'), false);
+  assert.equal(isMeaningfulTranscript('hi'), false);
+  assert.equal(isMeaningfulTranscript('what time is it'), true);
+  const out = []; const buffer = new SentenceBuffer({ onSentence: (s) => out.push(s) });
+  buffer.push('First sentence. Second'); buffer.push(' sentence!'); buffer.flush();
+  assert.deepEqual(out, ['First sentence.', 'Second sentence!']);
+});
+
+test('Phase 4 wake engine emits only configured local detections', () => {
+  const wake = new WakeEngine({ phrases: ['hey jarvis'], detect: () => ({ phrase: 'hey jarvis' }) });
+  const heard = []; wake.on('wake', (phrase) => heard.push(phrase)); wake.push(Buffer.from([0]));
+  assert.deepEqual(heard, ['hey jarvis']);
+  wake.pause(); wake.push(Buffer.from([0])); assert.equal(heard.length, 1);
+});
+
+test('Phase 4 VAD emits a bounded utterance after silence', () => {
+  const vad = new VadSegmenter({ frameMs: 100, params: { threshold: 0.6, minSpeechDurationMs: 100, minSilenceDurationMs: 200 } });
+  const utterances = []; vad.on('utterance', (audio) => utterances.push(audio));
+  const loud = Buffer.alloc(3200); for (let i = 0; i < loud.length; i += 2) loud.writeInt16LE(20_000, i); const quiet = Buffer.alloc(3200);
+  vad.push(loud); vad.push(quiet); vad.push(quiet);
+  assert.equal(utterances.length, 1); assert.ok(utterances[0].length > 0); assert.ok(pcmRms(loud) > 0);
+});
+
+test('Phase 4 fast commands are handled before the harness', () => {
+  assert.equal(fastCommand('Hands Off'), 'cancel');
+  assert.equal(fastCommand('take the wheel'), 'computer');
+  assert.equal(fastCommand('ordinary question'), null);
+});
+
+test('Phase 4 feedback gate drops capture while speaking and during cooldown', () => {
+  const capture = new EventEmitter(); capture.start = () => {}; capture.stop = () => {};
+  const wake = new WakeEngine({ detect: () => ({ phrase: 'hey jarvis' }) });
+  const vad = new VadSegmenter({ frameMs: 20 }); let pushed = 0; const original = vad.push.bind(vad); vad.push = (x) => { pushed++; original(x); };
+  const daemon = new EventEmitter(); daemon.state = 'LISTENING';
+  const loop = new VoiceLoop({ daemon, capture, wake, vad, now: () => 1000 }); loop.running = true;
+  loop.isSpeaking = true; loop.pushAudio(Buffer.alloc(3200)); assert.equal(pushed, 0);
+  loop.isSpeaking = false; loop.cooldownUntil = 1200; loop.pushAudio(Buffer.alloc(3200)); assert.equal(pushed, 0);
+});
+
+test('Phase 4 PipeWire capture uses a named 16 kHz mono node', () => {
+  let args; const child = new EventEmitter(); child.stdout = new EventEmitter(); child.stderr = new EventEmitter(); child.kill = () => {};
+  const capture = new PipeWireCapture({ spawnImpl: (_cmd, received) => { args = received; return child; } }); capture.start();
+  assert.deepEqual(args, ['--record', '--raw', '--format', 's16', '--rate', '16000', '--channels', '1', '--name', 'Jarvis']);
+  capture.stop();
+});