diff --git a/app/src/main/java/com/droiddeck/launcher/SessionActivity.kt b/app/src/main/java/com/droiddeck/launcher/SessionActivity.kt
index 478c6c706..29953e6c3 100644
--- a/app/src/main/java/com/droiddeck/launcher/SessionActivity.kt
+++ b/app/src/main/java/com/droiddeck/launcher/SessionActivity.kt
@@ -818,6 +818,9 @@ class SessionActivity : ComponentActivity(), SurfaceHolder.Callback {
                     lossless = lossless,
                     oscMode = oscMode, onScreenButtonsVisible = onScreenButtonsVisible, suspendPolicy = suspendPolicy,
                     steamDownloadsInBackground = steamDownloadsInBackground, touchMode = touchMode,
+                    micAvailable = SessionState.micAvailable && !SessionState.suspended,
+                    micEnabled = SessionState.micEnabled,
+                    onMicEnabled = { SessionService.setMicEnabled(this@SessionActivity, it) },
                     touchAuto = getString(if (usingTouchpad()) R.string.session_touch_auto_touchpad else R.string.session_touch_auto_direct),
                     fexPreset = fexPreset,
                     secondScreenMode = secondScreenMode,
diff --git a/app/src/main/java/com/droiddeck/launcher/audio/DirectAudioRelayComponent.java b/app/src/main/java/com/droiddeck/launcher/audio/DirectAudioRelayComponent.java
index f1fa53492..f8f1b2a3e 100644
--- a/app/src/main/java/com/droiddeck/launcher/audio/DirectAudioRelayComponent.java
+++ b/app/src/main/java/com/droiddeck/launcher/audio/DirectAudioRelayComponent.java
@@ -3,6 +3,7 @@ package com.droiddeck.launcher.audio;
 import android.os.Process;
 import android.util.Log;
 
+import com.droiddeck.launcher.core.FileUtils;
 import com.droiddeck.launcher.core.SessionPart;
 import com.droiddeck.launcher.core.HostProcess;
 
@@ -19,10 +20,13 @@ public class DirectAudioRelayComponent extends SessionPart {
     private volatile int pid = -1;
     private final Object micLock = new Object();
     private boolean micHot;
+    private final File micControl;
+    public java.util.function.Consumer<Boolean> onMicEnabled;
 
     public DirectAudioRelayComponent(File socketPath, File micFifoPath) {
         this.socketPath = socketPath;
         this.micFifoPath = micFifoPath;
+        this.micControl = micFifoPath == null ? null : new File(micFifoPath.getParentFile(), "mic-enabled");
     }
 
     public void setLogFile(File file) {
@@ -63,8 +67,13 @@ public class DirectAudioRelayComponent extends SessionPart {
         StringBuilder command = new StringBuilder(binary.getAbsolutePath());
         command.append(" --socket ").append(socketPath.getAbsolutePath());
         command.append(" --log");
-        if (micFifoPath != null) {
+        final boolean withMic = micFifoPath != null && setMicEnabled(true);
+        if (withMic) {
             command.append(" --mic-fifo ").append(micFifoPath.getAbsolutePath());
+            command.append(" --mic-control ").append(micControl.getAbsolutePath());
+        } else if (micFifoPath != null) {
+            Log.w(TAG, "microphone control unavailable; starting with capture disabled");
+            command.append(" --mic-control /dev/null");
         }
         ArrayList<String> env = new ArrayList<>();
         env.add("HOME=" + app().getFilesDir());
@@ -73,7 +82,7 @@ public class DirectAudioRelayComponent extends SessionPart {
             try {
                 out = new java.io.PrintWriter(new java.io.FileWriter(logFile, true));
                 out.println("== DirectAudio relay helper starting"
-                        + (micFifoPath != null ? " with the microphone" : " (no microphone)"));
+                        + (withMic ? " with the microphone" : " (no microphone)"));
                 out.flush();
             } catch (Exception e) {
                 Log.w(TAG, "could not open " + logFile, e);
@@ -84,14 +93,23 @@ public class DirectAudioRelayComponent extends SessionPart {
                 app().getFilesDir(), null,
                 line -> {
                     Log.i(TAG, line);
-                    trackMic(line);
+                    if (withMic) trackMic(line);
                     if (log != null) synchronized (log) { log.println(line); log.flush(); }
                 });
         Log.i(TAG, "started pid=" + pid + " socket=" + socketPath
-                + (micFifoPath != null ? " mic=" + micFifoPath : " (no microphone)"));
+                + (withMic ? " mic=" + micFifoPath : " (no microphone)"));
+    }
+
+    public synchronized boolean setMicEnabled(boolean enabled) {
+        if (micControl == null) return false;
+        File next = new File(micControl.getPath() + ".new");
+        return FileUtils.writeString(next, enabled ? "1" : "0") && next.renameTo(micControl);
     }
 
     private void trackMic(String line) {
+        if (line.startsWith("DA-Relay: mic enabled=") && onMicEnabled != null) {
+            onMicEnabled.accept(line.equals("DA-Relay: mic enabled=1"));
+        }
         boolean start = line.startsWith("DA-Relay: mic start ");
         if (!start && !line.startsWith("DA-Relay: mic stop ")) return;
         synchronized (micLock) {
diff --git a/app/src/main/java/com/droiddeck/launcher/session/SessionService.kt b/app/src/main/java/com/droiddeck/launcher/session/SessionService.kt
index 1293d1d60..fd8d8d373 100644
--- a/app/src/main/java/com/droiddeck/launcher/session/SessionService.kt
+++ b/app/src/main/java/com/droiddeck/launcher/session/SessionService.kt
@@ -278,6 +278,16 @@ class SessionService : Service() {
                 updateSuspendPolicy()
                 return START_NOT_STICKY
             }
+            ACTION_MIC_CHANGED -> {
+                if (SessionState.running && SessionState.micAvailable && !SessionState.suspended) {
+                    val enabled = intent.getBooleanExtra("enabled", false)
+                    val relay = components.firstNotNullOfOrNull { it as? DirectAudioRelayComponent }
+                    if (relay?.setMicEnabled(enabled) != true) {
+                        android.widget.Toast.makeText(this, R.string.drawer_mic_failed, android.widget.Toast.LENGTH_LONG).show()
+                    }
+                }
+                return START_NOT_STICKY
+            }
             ACTION_SUSPEND_POLICY_CHANGED -> {
                 if (!SessionState.running) return START_NOT_STICKY
                 suspendPolicy = SessionPrefs.suspendPolicy(this, SessionState.mode)
@@ -329,6 +339,8 @@ class SessionService : Service() {
         freezePending = false
         suspendAttemptFailed = false
         suspendController = null
+        SessionState.micAvailable = false
+        SessionState.micEnabled = false
         SessionState.suspended = false
         SessionState.resumeRequested = false
         SessionState.resuming = false
@@ -761,6 +773,15 @@ class SessionService : Service() {
         components.add(pulse)
         if (wantsDirectAudio || wantsMic) {
             val relay = DirectAudioRelayComponent(relaySocket, micFifo)
+            val gen = sessionGen
+            relay.onMicEnabled = java.util.function.Consumer { enabled ->
+                mainHandler.post {
+                    if (gen == sessionGen && SessionState.running && wantsMic) {
+                        SessionState.micAvailable = true
+                        SessionState.micEnabled = enabled
+                    }
+                }
+            }
             relay.setLogFile(audioLog)
             relay.attach(this)
             components.add(relay)
@@ -1656,6 +1677,8 @@ class SessionService : Service() {
             SessionState.running = false
             SessionPaths.take() to SessionState.steamClientArch
         }
+        SessionState.micAvailable = false
+        SessionState.micEnabled = false
         xrActivityVisible = false
         updateDownloadMonitoring()
         val stoppedGen = sessionGen
@@ -1948,6 +1971,7 @@ class SessionService : Service() {
         const val ACTION_LAUNCH_GAME = "com.droiddeck.launcher.LAUNCH_STEAM_GAME"
         const val ACTION_HOME_GUIDE = "com.droiddeck.launcher.HOME_GUIDE"
         const val ACTION_AGENT_START = "com.droiddeck.launcher.AGENT_START"
+        private const val ACTION_MIC_CHANGED = "com.droiddeck.launcher.MIC_CHANGED"
         private const val ACTION_SUSPEND_POLICY_CHANGED = "com.droiddeck.launcher.SUSPEND_POLICY_CHANGED"
         private const val ACTION_ACTIVITY_VISIBLE = "com.droiddeck.launcher.ACTIVITY_VISIBLE"
         private const val ACTION_ACTIVITY_HIDDEN = "com.droiddeck.launcher.ACTIVITY_HIDDEN"
@@ -2078,6 +2102,11 @@ class SessionService : Service() {
             }.getOrDefault(false)
         }
 
+        fun setMicEnabled(context: Context, enabled: Boolean) {
+            context.startService(Intent(context, SessionService::class.java).setAction(ACTION_MIC_CHANGED)
+                .putExtra("enabled", enabled))
+        }
+
         fun suspendPolicyChanged(context: Context) {
             if (!SessionState.running) return
             context.startService(Intent(context, SessionService::class.java).setAction(ACTION_SUSPEND_POLICY_CHANGED))
diff --git a/app/src/main/java/com/droiddeck/launcher/session/SessionState.kt b/app/src/main/java/com/droiddeck/launcher/session/SessionState.kt
index 5ff739e47..6bdece304 100644
--- a/app/src/main/java/com/droiddeck/launcher/session/SessionState.kt
+++ b/app/src/main/java/com/droiddeck/launcher/session/SessionState.kt
@@ -46,6 +46,8 @@ object SessionState {
     var activityDisplayId = 0
     @Volatile
     var runtimeDriver: String? = null
+    var micAvailable by mutableStateOf(false)
+    var micEnabled by mutableStateOf(false)
     var suspended by mutableStateOf(false)
     var resumeRequested by mutableStateOf(false)
     var resuming by mutableStateOf(false)
diff --git a/app/src/main/java/com/droiddeck/launcher/ui/SessionOverlay.kt b/app/src/main/java/com/droiddeck/launcher/ui/SessionOverlay.kt
index 58b4c11ee..ef90316ea 100644
--- a/app/src/main/java/com/droiddeck/launcher/ui/SessionOverlay.kt
+++ b/app/src/main/java/com/droiddeck/launcher/ui/SessionOverlay.kt
@@ -208,6 +208,9 @@ class DrawerActions(
     val onScreenButtonsVisible: Boolean,
     val suspendPolicy: String,
     val steamDownloadsInBackground: Boolean = false,
+    val micAvailable: Boolean = false,
+    val micEnabled: Boolean = false,
+    val onMicEnabled: (Boolean) -> Unit = {},
     val backActionsInverted: Boolean,
     val padType: String? = null,
     val onPadType: (String) -> Unit = {},
@@ -669,6 +672,9 @@ internal fun SessionDrawer(open: Boolean, requestedPage: SessionDrawerPage, cont
                                 }
                             }
                             SettingsGroup(stringResource(R.string.drawer_session_behavior)) {
+                                if (a.micAvailable) ToggleRow(host, "microphone", stringResource(R.string.mode_mic),
+                                    stringResource(R.string.drawer_mic_hint), a.micEnabled,
+                                    chipModifier = focus.track(page, "microphone"), onChange = a.onMicEnabled)
                                 ChoiceRow(
                                     host, "suspend", stringResource(R.string.mode_suspend),
                                     null,
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f42580fff..d0d524647 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -389,6 +389,8 @@
     <string name="mode_directaudio_hint">Bypasses PulseAudio for lower latency.</string>
     <string name="mode_mic">Microphone</string>
     <string name="mode_mic_hint">For voice chat.</string>
+    <string name="drawer_mic_hint">Turn microphone capture on or off for this session.</string>
+    <string name="drawer_mic_failed">Could not change the microphone. Please try again.</string>
     <string name="mode_network">Network</string>
     <string name="mode_wifi_discovery">Wi-Fi discovery</string>
     <string name="mode_wifi_discovery_hint">Show Wi-Fi names and nearby networks in Steam.</string>
diff --git a/app/src/test/java/com/droiddeck/launcher/audio/DirectAudioMicrophoneTest.kt b/app/src/test/java/com/droiddeck/launcher/audio/DirectAudioMicrophoneTest.kt
new file mode 100644
index 000000000..88a211b85
--- /dev/null
+++ b/app/src/test/java/com/droiddeck/launcher/audio/DirectAudioMicrophoneTest.kt
@@ -0,0 +1,86 @@
+package com.droiddeck.launcher.audio
+
+import org.junit.Assert.*
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.rules.TemporaryFolder
+import org.robolectric.RuntimeEnvironment
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+import org.robolectric.util.ReflectionHelpers
+import java.io.File
+import java.util.function.Consumer
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [28])
+class DirectAudioMicrophoneTest {
+    @get:Rule val folder = TemporaryFolder()
+
+    @Test fun toggleOnlyChangesTheSessionCaptureControl() {
+        val fifo = File(folder.root, "mic.fifo")
+        val relay = DirectAudioRelayComponent(File(folder.root, "relay.sock"), fifo)
+        val changes = mutableListOf<Boolean>()
+        relay.onMicEnabled = Consumer { changes.add(it) }
+        val control = File(folder.root, "mic-enabled")
+        assertTrue(relay.setMicEnabled(false))
+        assertEquals("0", control.readText())
+        assertTrue(changes.isEmpty())
+        log(relay, "DA-Relay: mic enabled=0")
+        assertEquals(listOf(false), changes)
+        assertTrue(relay.setMicEnabled(true))
+        assertEquals("1", control.readText())
+        log(relay, "DA-Relay: mic enabled=1")
+        assertEquals(listOf(false, true), changes)
+        assertFalse(fifo.exists())
+    }
+
+    @Test fun sessionWithoutCaptureCannotEnableIt() {
+        val relay = DirectAudioRelayComponent(File(folder.root, "relay.sock"), null)
+        assertFalse(relay.setMicEnabled(true))
+        assertFalse(File(folder.root, "mic-enabled").exists())
+    }
+
+    @Test fun captureDemandDoesNotOverrideTheAcknowledgedToggle() {
+        val relay = DirectAudioRelayComponent(File(folder.root, "relay.sock"), File(folder.root, "mic.fifo"))
+        val changes = mutableListOf<Boolean>()
+        relay.onMicEnabled = Consumer { changes.add(it) }
+        log(relay, "DA-Relay: mic enabled=0")
+        log(relay, "DA-Relay: mic start (game wants it, 1 consumer(s))")
+        log(relay, "DA-Relay: mic stop (game)")
+        assertEquals(listOf(false), changes)
+        assertTrue(relay.awaitMicReleased(0))
+    }
+
+    @Test fun controlWriteFailureStillStartsPlaybackWithCaptureDisabled() {
+        val context = RuntimeEnvironment.getApplication()
+        val info = context.applicationInfo
+        val previous = info.nativeLibraryDir
+        val nativeDir = folder.newFolder("native")
+        val args = File(folder.root, "arguments")
+        File(nativeDir, DirectAudioRelayComponent.BINARY).apply {
+            writeText("#!/bin/sh\nprintf '%s\\n' \"\$@\" > '${args.path}.new'\nmv '${args.path}.new' '${args.path}'\n")
+            setExecutable(true)
+        }
+        val fifo = folder.newFile("mic.fifo")
+        File(folder.root, "mic-enabled.new").mkdir()
+        val relay = DirectAudioRelayComponent(File(folder.root, "relay.sock"), fifo)
+        relay.attach(context)
+        try {
+            info.nativeLibraryDir = nativeDir.path
+            relay.start()
+            val deadline = System.nanoTime() + 3_000_000_000L
+            while (!args.isFile && System.nanoTime() < deadline) Thread.sleep(10)
+            assertTrue("Playback helper did not start", args.isFile)
+            val command = args.readLines()
+            assertTrue(command.contains("--socket"))
+            assertFalse(command.contains("--mic-fifo"))
+            assertEquals(listOf("--mic-control", "/dev/null"), command.takeLast(2))
+        } finally {
+            info.nativeLibraryDir = previous
+        }
+    }
+
+    private fun log(relay: DirectAudioRelayComponent, line: String) =
+        ReflectionHelpers.callInstanceMethod<Unit>(relay, "trackMic", ReflectionHelpers.ClassParameter.from(String::class.java, line))
+}
diff --git a/app/src/test/java/com/droiddeck/launcher/ui/SessionSecondScreenTest.kt b/app/src/test/java/com/droiddeck/launcher/ui/SessionSecondScreenTest.kt
index 04d3f5632..735632e61 100644
--- a/app/src/test/java/com/droiddeck/launcher/ui/SessionSecondScreenTest.kt
+++ b/app/src/test/java/com/droiddeck/launcher/ui/SessionSecondScreenTest.kt
@@ -9,6 +9,7 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.compose.ui.test.*
+import androidx.compose.ui.semantics.SemanticsProperties.StateDescription
 import androidx.compose.runtime.MutableState
 import com.droiddeck.launcher.R
 import com.droiddeck.launcher.SessionActivity
@@ -97,6 +98,42 @@ class SessionSecondScreenTest {
         }
     }
 
+    @Test fun sessionMicrophoneCanBeTurnedOff() {
+        val changes = mutableListOf<Boolean>()
+        compose.setContent {
+            DroidDeckTheme {
+                SessionDrawer(true, SessionDrawerPage.SESSION, false, {},
+                    actions(true, emptyList(), micAvailable = true, micEnabled = true, onMic = changes::add))
+            }
+        }
+        compose.onNodeWithTag("setting-microphone").assertIsEnabled()
+            .assert(SemanticsMatcher.expectValue(StateDescription, context.getString(R.string.widgets_on))).performClick()
+        assertEquals(listOf(false), changes)
+    }
+
+    @Test fun sessionMicrophoneCanBeTurnedBackOn() {
+        val changes = mutableListOf<Boolean>()
+        compose.setContent {
+            DroidDeckTheme {
+                SessionDrawer(true, SessionDrawerPage.SESSION, false, {},
+                    actions(true, emptyList(), micAvailable = true, onMic = changes::add))
+            }
+        }
+        compose.onNodeWithTag("setting-microphone").assertIsEnabled()
+            .assert(SemanticsMatcher.expectValue(StateDescription, context.getString(R.string.widgets_off))).performClick()
+        assertEquals(listOf(true), changes)
+    }
+
+    @Test fun sessionWithoutMicrophoneOmitsCaptureControl() {
+        compose.setContent {
+            DroidDeckTheme {
+                SessionDrawer(true, SessionDrawerPage.SESSION, false, {}, actions(false, emptyList()))
+            }
+        }
+        compose.onNodeWithTag("setting-microphone").assertDoesNotExist()
+        compose.onNodeWithText(context.getString(R.string.mode_mic)).assertDoesNotExist()
+    }
+
     private fun checkModes(steam: Boolean) {
         SessionState.mode = if (steam) SessionService.MODE_STEAM else SessionService.MODE_DESKTOP
         val selected = mutableListOf<SecondScreenMode>()
@@ -145,8 +182,11 @@ class SessionSecondScreenTest {
         if (view is ViewGroup) for (index in 0 until view.childCount) yieldAll(descendants(view.getChildAt(index)))
     }
 
-    private fun actions(steam: Boolean, displays: List<SecondScreenDisplay>, select: (SecondScreenMode) -> Unit = {}) =
+    private fun actions(steam: Boolean, displays: List<SecondScreenDisplay>,
+        micAvailable: Boolean = false, micEnabled: Boolean = false, onMic: (Boolean) -> Unit = {},
+        select: (SecondScreenMode) -> Unit = {}) =
         DrawerActions(steam = steam, isHomeApp = false, androidApps = emptyList(), hudOn = false,
+            micAvailable = micAvailable, micEnabled = micEnabled, onMicEnabled = onMic,
             frameGen = FrameGen.Mode.OFF, lossless = Lossless.State.NONE, oscMode = "never",
             onScreenButtonsVisible = false, suspendPolicy = "auto", backActionsInverted = false,
             touchMode = "auto", touchAuto = "trackpad", fexPreset = "default",
diff --git a/tools/components/recipes.json b/tools/components/recipes.json
index 19144018f..602fb379e 100644
--- a/tools/components/recipes.json
+++ b/tools/components/recipes.json
@@ -110,7 +110,8 @@
     ],
     "outputs": [
       "app/src/main/jniLibs/arm64-v8a/libdirectaudiorelay.so"
-    ]
+    ],
+    "ndk": true
   },
   "audio": {
     "script": "tools/components/recipes/audio.sh",
diff --git a/tools/directaudio/build-relay.sh b/tools/directaudio/build-relay.sh
new file mode 100755
index 000000000..59c071616
--- /dev/null
+++ b/tools/directaudio/build-relay.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+repo_root=$1
+source_dir=$2
+: "${NDK:=${ANDROID_NDK_LATEST_HOME:-${ANDROID_NDK_HOME:-${ANDROID_NDK_ROOT:-}}}}"
+: "${NDK:?set NDK to the Android NDK root}"
+case "$(uname -s)" in
+  Darwin) host=darwin-x86_64 ;;
+  Linux) host=linux-x86_64 ;;
+  *) echo 'Unsupported NDK host' >&2; exit 1 ;;
+esac
+toolchain="$NDK/toolchains/llvm/prebuilt/$host/bin"
+patch -d "$source_dir" -p1 < "$repo_root/tools/directaudio/microphone-toggle.patch"
+"$toolchain/aarch64-linux-android28-clang" -O2 -Wl,-z,max-page-size=16384 \
+  "$source_dir/directaudio-relay.c" -o "$repo_root/app/src/main/jniLibs/arm64-v8a/libdirectaudiorelay.so" \
+  -laaudio -llog -pthread
+"$toolchain/llvm-strip" --strip-unneeded "$repo_root/app/src/main/jniLibs/arm64-v8a/libdirectaudiorelay.so"
diff --git a/tools/directaudio/fetch.sh b/tools/directaudio/fetch.sh
index af886304f..35e327382 100755
--- a/tools/directaudio/fetch.sh
+++ b/tools/directaudio/fetch.sh
@@ -3,7 +3,7 @@ set -euo pipefail
 repo_root=$1
 sink_out=$2
 . "${repo_root}/tools/directaudio/release.env"
-for v in DIRECTAUDIO_REPO DIRECTAUDIO_TAG DIRECTAUDIO_WINE11_SHA256 DIRECTAUDIO_SYSTHREAD_SHA256 DIRECTAUDIO_RELAY_SHA256 DIRECTAUDIO_SINK_SHA256; do
+for v in DIRECTAUDIO_REPO DIRECTAUDIO_TAG DIRECTAUDIO_WINE11_SHA256 DIRECTAUDIO_SYSTHREAD_SHA256 DIRECTAUDIO_SINK_SHA256 DIRECTAUDIO_SOURCE_COMMIT DIRECTAUDIO_SOURCE_SHA256; do
   [[ -n "${!v:-}" && "${!v}" != TBD ]] || { echo "tools/directaudio/release.env: ${v} is not set" >&2; exit 1; }
 done
 work=$(mktemp -d)
@@ -24,7 +24,15 @@ fetch() {
 }
 fetch directaudio-linux-wine11.zip "${DIRECTAUDIO_WINE11_SHA256}"
 fetch directaudio-linux-wine11-systhread.zip "${DIRECTAUDIO_SYSTHREAD_SHA256}"
-fetch directaudio-linux-relay.zip "${DIRECTAUDIO_RELAY_SHA256}"
+source_archive="${cache}/${DIRECTAUDIO_SOURCE_SHA256}-directaudio-source.tar.gz"
+if ! echo "${DIRECTAUDIO_SOURCE_SHA256}  ${source_archive}" | sha256sum -c - >/dev/null 2>&1; then
+  curl -fsSL --retry 3 -o "${work}/source.tar.gz" \
+    "https://github.com/${DIRECTAUDIO_REPO}/archive/${DIRECTAUDIO_SOURCE_COMMIT}.tar.gz"
+  echo "${DIRECTAUDIO_SOURCE_SHA256}  ${work}/source.tar.gz" | sha256sum -c - >/dev/null
+  mv "${work}/source.tar.gz" "${source_archive}"
+fi
+mkdir "${work}/source"
+tar -xzf "${source_archive}" --strip-components=1 -C "${work}/source"
 fetch directaudio-linux-sink.zip "${DIRECTAUDIO_SINK_SHA256}"
 
 assets="${repo_root}/app/src/main/assets/directaudio"
@@ -40,9 +48,8 @@ done
 grep -q '^abi wine11$' "${assets}/linux-wine11/version.txt"
 grep -q '^abi systhread$' "${assets}/linux-wine11-systhread/version.txt"
 
-mkdir -p "${work}/relay" "${work}/sink" "${sink_out}" "${repo_root}/app/src/main/jniLibs/arm64-v8a"
-unzip -q "${work}/directaudio-linux-relay.zip" -d "${work}/relay"
-install -m755 "${work}/relay/libdirectaudiorelay.so" "${repo_root}/app/src/main/jniLibs/arm64-v8a/libdirectaudiorelay.so"
+mkdir -p "${work}/sink" "${sink_out}" "${repo_root}/app/src/main/jniLibs/arm64-v8a"
+"${repo_root}/tools/directaudio/build-relay.sh" "${repo_root}" "${work}/source"
 unzip -q "${work}/directaudio-linux-sink.zip" -d "${work}/sink"
 install -m755 "${work}/sink/module-directaudio-native-sink.so" "${sink_out}/"
 echo "DirectAudio ${DIRECTAUDIO_TAG}: two driver sets, the relay helper and the client sink in place"
diff --git a/tools/directaudio/microphone-toggle.patch b/tools/directaudio/microphone-toggle.patch
new file mode 100644
index 000000000..22af228c0
--- /dev/null
+++ b/tools/directaudio/microphone-toggle.patch
@@ -0,0 +1,123 @@
+--- a/directaudio-relay.c
++++ b/directaudio-relay.c
+@@ -70,6 +70,9 @@
+  * session log captures it too. Event-level lines are always on: they fire a
+  * handful of times per session and are what makes a field report actionable. */
+ static int g_verbose;
++static const char *g_mic_control;
++static int g_mic_enabled = 1;
++static pthread_mutex_t g_mic_operations = PTHREAD_MUTEX_INITIALIZER;
+ 
+ static void rlog(const char *fmt, ...)
+ {
+@@ -735,6 +738,9 @@
+     (void)user;
+     if (aq != __atomic_load_n(&g_mic.cq, __ATOMIC_SEQ_CST) && __atomic_load_n(&g_mic.cq, __ATOMIC_SEQ_CST))
+         return AAUDIO_CALLBACK_RESULT_CONTINUE;
++    if (!__atomic_load_n(&g_mic_enabled, __ATOMIC_ACQUIRE))
++        memset(audioData, 0, numFrames * g_mic.in_channels *
++               (g_mic.in_format == AAUDIO_FORMAT_PCM_I16 ? sizeof(int16_t) : sizeof(float)));
+     __atomic_add_fetch(&g_mic.cb_count, 1, __ATOMIC_RELAXED);
+ 
+     pthread_mutex_lock(&g_clients_lock);
+@@ -832,13 +838,14 @@
+     AAudioStream *aq = NULL;
+     int start = 0, stop = 0;
+ 
++    pthread_mutex_lock(&g_mic_operations);
+     pthread_mutex_lock(&g_mic.lock);
+     g_mic.want += delta;
+     if (g_mic.want < 0) g_mic.want = 0;
+     if (g_mic.cq)
+     {
+-        if (g_mic.want > 0 && !g_mic.started) { g_mic.started = 1; start = 1; aq = g_mic.cq; }
+-        if (g_mic.want == 0 && g_mic.started) { g_mic.started = 0; stop = 1; aq = g_mic.cq; }
++        if (g_mic.want > 0 && __atomic_load_n(&g_mic_enabled, __ATOMIC_ACQUIRE) && !g_mic.started) { g_mic.started = 1; start = 1; aq = g_mic.cq; }
++        if ((g_mic.want == 0 || !__atomic_load_n(&g_mic_enabled, __ATOMIC_ACQUIRE)) && g_mic.started) { g_mic.started = 0; stop = 1; aq = g_mic.cq; }
+     }
+     pthread_mutex_unlock(&g_mic.lock);
+ 
+@@ -856,8 +863,23 @@
+     else if (stop)
+     {
+         AAudioStream_requestStop(aq);
+-        REVENT("mic stop (%s was the last consumer)", who);
+-    }
++        REVENT("mic stop (%s)", who);
++    }
++    pthread_mutex_unlock(&g_mic_operations);
++}
++
++static void mic_control_update(void)
++{
++    FILE *f;
++    int enabled;
++    if (!g_mic_control) return;
++    f = fopen(g_mic_control, "r");
++    enabled = f && fgetc(f) == '1';
++    if (f) fclose(f);
++    if (enabled == __atomic_load_n(&g_mic_enabled, __ATOMIC_ACQUIRE)) return;
++    __atomic_store_n(&g_mic_enabled, enabled, __ATOMIC_RELEASE);
++    mic_want(0, "session toggle");
++    REVENT("mic enabled=%d", enabled);
+ }
+ 
+ static void *mic_reopen_thread(void *unused)
+@@ -870,8 +892,9 @@
+ 
+         __atomic_store_n(&g_mic.reopen_redo, 0, __ATOMIC_SEQ_CST);
+ 
++        pthread_mutex_lock(&g_mic_operations);
+         pthread_mutex_lock(&g_mic.lock);
+-        want_start = g_mic.want > 0;
++        want_start = g_mic.want > 0 && __atomic_load_n(&g_mic_enabled, __ATOMIC_ACQUIRE);
+         pthread_mutex_unlock(&g_mic.lock);
+ 
+         if (open_input(&neu) == AAUDIO_OK)
+@@ -902,6 +925,7 @@
+             AAudioStream_close(old);
+         }
+ 
++        pthread_mutex_unlock(&g_mic_operations);
+         if (__atomic_load_n(&g_mic.reopen_redo, __ATOMIC_SEQ_CST)) { usleep(20000); continue; }
+         __atomic_store_n(&g_mic.reopen_running, 0, __ATOMIC_SEQ_CST);
+         if (!__atomic_load_n(&g_mic.reopen_redo, __ATOMIC_SEQ_CST)) break;
+@@ -1348,7 +1372,8 @@
+ /* ---- housekeeping: watchdog tick + mailbox watch, once a second ------------- */
+ static void *housekeeping_thread(void *unused)
+ {
+-    struct timespec iv = { 1, 0 };
++    struct timespec iv = { 0, 100000000 };
++    unsigned tick = 0;
+ 
+     (void)unused;
+     for (;;)
+@@ -1357,6 +1382,8 @@
+         int reload = 0;
+ 
+         nanosleep(&iv, NULL);
++        mic_control_update();
++        if (++tick % 10) continue;
+ 
+         if (g_rt_path[0])
+         {
+@@ -1402,8 +1429,9 @@
+     {
+         if (!strcmp(argv[i], "--socket") && i + 1 < argc) path = argv[++i];
+         else if (!strcmp(argv[i], "--mic-fifo") && i + 1 < argc) fifo_path = argv[++i];
++        else if (!strcmp(argv[i], "--mic-control") && i + 1 < argc) g_mic_control = argv[++i];
+         else if (!strcmp(argv[i], "--log")) g_verbose = 1;
+-        else { fprintf(stderr, "usage: directaudio-relay --socket <path> [--mic-fifo <path>] [--log]\n"); return 2; }
++        else { fprintf(stderr, "usage: directaudio-relay --socket <path> [--mic-fifo <path>] [--mic-control <path>] [--log]\n"); return 2; }
+     }
+     if (!path)
+     {
+@@ -1429,6 +1457,8 @@
+     chmod(path, 0666);
+     if (listen(srv, 8) != 0) { REVENT("listen: %d", errno); return 1; }
+ 
++    mic_control_update();
++    REVENT("mic enabled=%d", __atomic_load_n(&g_mic_enabled, __ATOMIC_ACQUIRE));
+     if (pthread_create(&th, NULL, housekeeping_thread, NULL) == 0) pthread_detach(th);
+     if (fifo_path && fifo_setup(fifo_path) != 0)
+         REVENT("mic-fifo: disabled");
diff --git a/tools/directaudio/release.env b/tools/directaudio/release.env
index 5e052f0bb..95359b3ae 100644
--- a/tools/directaudio/release.env
+++ b/tools/directaudio/release.env
@@ -2,5 +2,6 @@ DIRECTAUDIO_REPO=The412Banner/directaudio
 DIRECTAUDIO_TAG=directaudio-linux-v1.1.0
 DIRECTAUDIO_WINE11_SHA256=835e6cab072f5148893c43379e60506483aeb3f1444e777b430c295cbeb472c9
 DIRECTAUDIO_SYSTHREAD_SHA256=2ddc47f446142d5940540ad40a423ca8d47fd536e3225b888df1077c6be7329e
-DIRECTAUDIO_RELAY_SHA256=b68eb6d7a892fd92a1cd73fac36dc05cabb77cc73792e2c582d3eeccad355942
 DIRECTAUDIO_SINK_SHA256=1d5d3ed709e5389ef7603f019c62b07e4e8428bb42882193d4a144a5c15425b6
+DIRECTAUDIO_SOURCE_COMMIT=52aedbf8ddd42874a5bbd21df20e1046367f442e
+DIRECTAUDIO_SOURCE_SHA256=a20c9a0684ae3b1e60a6b9c17b7f1d5ec2501627ae9683aa9f391576a6c1974d