diff --git a/OsmAnd/src/net/osmand/plus/voice/MediaCommandPlayerImpl.java b/OsmAnd/src/net/osmand/plus/voice/MediaCommandPlayerImpl.java
index 2645849cc0..6bc3414c2a 100644
--- a/OsmAnd/src/net/osmand/plus/voice/MediaCommandPlayerImpl.java
+++ b/OsmAnd/src/net/osmand/plus/voice/MediaCommandPlayerImpl.java
@@ -46,6 +46,7 @@ public class MediaCommandPlayerImpl extends AbstractPrologCommandPlayer implemen
 		mediaPlayer = null;
 	}
 	
+	//  Called from the calculating route thread.
 	@Override
 	public synchronized void playCommands(CommandBuilder builder) {
 		filesToPlay.addAll(builder.execute());
@@ -79,7 +80,7 @@ public class MediaCommandPlayerImpl extends AbstractPrologCommandPlayer implemen
 	}
 	
 	/**
-	 * Called when the MediaPlayer is done.
+	 * Called when the MediaPlayer is done.  The call back is on the main thread.
 	 */
 	@Override
 	public void onCompletion(MediaPlayer mp) {
@@ -87,7 +88,6 @@ public class MediaCommandPlayerImpl extends AbstractPrologCommandPlayer implemen
 		playQueue();
 	}
 
-
 	private void performDelays() {
 		int sleep = 0;
 		while (!filesToPlay.isEmpty() && filesToPlay.get(0).startsWith(DELAY_CONST)) {
@@ -98,8 +98,10 @@ public class MediaCommandPlayerImpl extends AbstractPrologCommandPlayer implemen
 			}
 		}
 		try {
-			if (sleep != 0)
+			if (sleep != 0) {
+				log.debug("Delaying "+sleep);
 				Thread.sleep(sleep);
+			}
 		} catch (InterruptedException e) {
 		}
 	}
@@ -109,10 +111,7 @@ public class MediaCommandPlayerImpl extends AbstractPrologCommandPlayer implemen
 			String f = filesToPlay.remove(0);
 			if (f != null && voiceDir != null) {
 				File file = new File(voiceDir, f);
-				if (file.exists()) 
-					return file;
-				else
-					log.error("Unable to play, does not exist: "+file);
+				return file;
 			}
 		}
 		return null;
@@ -124,8 +123,13 @@ public class MediaCommandPlayerImpl extends AbstractPrologCommandPlayer implemen
 	 * @param file
 	 */
 	private void playFile(File file)  {
-		log.debug("Playing file : " + file); //$NON-NLS-1$
+		if (!file.exists()) {
+			log.error("Unable to play, does not exist: "+file);
+			playQueue();
+			return;
+		}
 		try {
+			log.debug("Playing file : " + file); //$NON-NLS-1$
 			mediaPlayer.reset();
 			mediaPlayer.setAudioStreamType(streamType);
 			mediaPlayer.setDataSource(file.getAbsolutePath());
diff --git a/OsmAnd/src/net/osmand/plus/voice/TTSCommandPlayerImpl.java b/OsmAnd/src/net/osmand/plus/voice/TTSCommandPlayerImpl.java
index 3ad601c670..6e5ee1dd5e 100644
--- a/OsmAnd/src/net/osmand/plus/voice/TTSCommandPlayerImpl.java
+++ b/OsmAnd/src/net/osmand/plus/voice/TTSCommandPlayerImpl.java
@@ -90,8 +90,9 @@ public class TTSCommandPlayerImpl extends AbstractPrologCommandPlayer {
 	 */
 	private int ttsRequests;
 	
+	// Called from the calculating route thread.
 	@Override
-	public void playCommands(CommandBuilder builder) {
+	public synchronized void playCommands(CommandBuilder builder) {
 		if (mTts != null) {
 			final List<String> execute = builder.execute(); //list of strings, the speech text, play it
 			StringBuilder bld = new StringBuilder();
@@ -101,6 +102,7 @@ public class TTSCommandPlayerImpl extends AbstractPrologCommandPlayer {
 			if (ttsRequests++ == 0)
 				requestAudioFocus();
 			log.debug("ttsRequests="+ttsRequests);
+			params.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID,""+System.currentTimeMillis());
 			mTts.speak(bld.toString(), TextToSpeech.QUEUE_ADD, params);
 			// Audio focus will be released when onUtteranceCompleted() completed is called by the TTS engine.
 		}
@@ -160,8 +162,9 @@ public class TTSCommandPlayerImpl extends AbstractPrologCommandPlayer {
 				}
 			});
 			mTts.setOnUtteranceCompletedListener(new OnUtteranceCompletedListener() {
+				// The call back is on a binder thread.
 				@Override
-				public void onUtteranceCompleted(String utteranceId) {
+				public synchronized void onUtteranceCompleted(String utteranceId) {
 					if (--ttsRequests == 0)
 						abandonAudioFocus();
 					log.debug("ttsRequests="+ttsRequests);