diff --git a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioAudioEngine.kt b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioAudioEngine.kt
index 1d796e2a..d9291425 100644
--- a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioAudioEngine.kt
+++ b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioAudioEngine.kt
@@ -285,13 +285,13 @@ class RadioAudioEngine {
         check(trackMin > 0) { "AudioTrack minimum buffer invalid group=$group value=$trackMin" }
         val trackBuf = (trackMin * 2).coerceAtLeast(FRAME_SAMPLES * PLAY_CHANNELS * 4)
         val track = AudioTrack(
-                AudioAttributes.Builder()
-                    .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
-                    .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH).build(),
-                AudioFormat.Builder().setSampleRate(SAMPLE_RATE)
-                    .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
-                    .setChannelMask(AudioFormat.CHANNEL_OUT_STEREO).build(),
-                trackBuf, AudioTrack.MODE_STREAM, AudioManager.AUDIO_SESSION_ID_GENERATE)
+            AudioAttributes.Builder()
+                .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
+                .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH).build(),
+            AudioFormat.Builder().setSampleRate(SAMPLE_RATE)
+                .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
+                .setChannelMask(AudioFormat.CHANNEL_OUT_STEREO).build(),
+            trackBuf, AudioTrack.MODE_STREAM, AudioManager.AUDIO_SESSION_ID_GENERATE)
 
         audioTrack = track
 
@@ -525,10 +525,12 @@ class RadioAudioEngine {
     /** Дождаться своего worker до остановки DSP; interruption не разрешает освободить используемые им ресурсы. */
     private fun joinWorker(worker: Thread?, kind: String): Boolean {
         var interrupted = Thread.interrupted()
+        if (worker != null) LogManager.addLog("DEBUG", "RadioAudio", "joining $kind worker=${worker.name} group=$audioGroup")
         while (worker?.isAlive == true) try { worker.join() } catch (e: InterruptedException) {
             interrupted = true
             LogManager.addLog("WARN", "RadioAudio", "$kind join interrupted group=$audioGroup; finishing cleanup")
         }
+        if (worker != null) LogManager.addLog("DEBUG", "RadioAudio", "$kind worker joined group=$audioGroup")
         return interrupted
     }
 
diff --git a/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/RadioAudioLifecycleTest.kt b/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/RadioAudioLifecycleTest.kt
index 21c96254..1f2db894 100644
--- a/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/RadioAudioLifecycleTest.kt
+++ b/tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/RadioAudioLifecycleTest.kt
@@ -305,4 +305,25 @@ class RadioAudioLifecycleTest {
         assertTrue(engine.isActive()); assertFalse(track.released); assertEquals(1, AudioTrack.created.size)
         diagnostic("zero group ID")
     }
+
+    @Test fun failedRestoreAfterCallDisablesNativeGroupMembershipBeforeClearingThePublishedGroup() {
+        context.configProvider.failRadioSettings = true
+        engine.restoreAfterCall(7); drain(); main.dispatchAll(); drain()
+        val activation = synchronized(NativeLib.radioCommands) { NativeLib.radioCommands.filter { it.kind.startsWith("active=") } }
+        assertEquals(listOf("active=true", "active=false"), activation.map { it.kind })
+        assertFalse(engine.isActive()); assertNull(engine.activeGroup.value)
+    }
+
+    @Test fun reentrantStartFromFailedReadinessCannotBeClearedByTheOldCallback() {
+        context.configProvider.failRadioSettings = true
+        val results = mutableListOf<Pair<Long, Boolean>>()
+        engine.start(7) { ready ->
+            results.add(7L to ready)
+            context.configProvider.failRadioSettings = false
+            engine.start(8) { results.add(8L to it) }
+        }
+        drain(); main.dispatchAll(); drain(); main.dispatchAll()
+        assertEquals(listOf(7L to false, 8L to true), results)
+        assertEquals(8L, engine.activeGroup.value); assertTrue(engine.isActive())
+    }
 }