diff --git a/app/build.gradle b/app/build.gradle
index f6a91ea..660198c 100755
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -7,8 +7,8 @@ android {
         applicationId "omegacentauri.mobi.simplestopwatch"
         minSdkVersion 4
         targetSdkVersion 28
-        versionCode 11
-        versionName "1.10"
+        versionCode 12
+        versionName "1.11"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
diff --git a/app/src/main/java/omegacentauri/mobi/simplestopwatch/MyChrono.java b/app/src/main/java/omegacentauri/mobi/simplestopwatch/MyChrono.java
index 200142c..1859374 100755
--- a/app/src/main/java/omegacentauri/mobi/simplestopwatch/MyChrono.java
+++ b/app/src/main/java/omegacentauri/mobi/simplestopwatch/MyChrono.java
@@ -345,10 +345,17 @@ public void setAudio(String soundMode) {
         longTone = new AudioTrack(STREAM, 44100, AudioFormat.CHANNEL_OUT_MONO,
                 AudioFormat.ENCODING_PCM_16BIT, tone.length * 2, AudioTrack.MODE_STATIC);
         longTone.write(tone, 0, tone.length);
-        int sessionId = longTone.getAudioSessionId();
+        int sessionId = 0;
         int shortLength = Math.min(tone.length, (int) (44.100 * SHORT_TONE_LENGTH));
-        shortTone = new AudioTrack(STREAM, 44100, AudioFormat.CHANNEL_OUT_MONO,
-                AudioFormat.ENCODING_PCM_16BIT, shortLength * 2, AudioTrack.MODE_STATIC, sessionId);
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD) {
+            sessionId = longTone.getAudioSessionId();
+            shortTone = new AudioTrack(STREAM, 44100, AudioFormat.CHANNEL_OUT_MONO,
+                    AudioFormat.ENCODING_PCM_16BIT, shortLength * 2, AudioTrack.MODE_STATIC, sessionId);
+        }
+        else {
+            shortTone = new AudioTrack(STREAM, 44100, AudioFormat.CHANNEL_OUT_MONO,
+                    AudioFormat.ENCODING_PCM_16BIT, shortLength * 2, AudioTrack.MODE_STATIC);
+        }
         shortTone.write(tone, 0, shortLength);
         AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
         am.setStreamVolume(STREAM, am.getStreamMaxVolume(STREAM), 0);