diff --git a/build.gradle b/build.gradle
index c51327f..31137c3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -28,10 +28,10 @@ android {
 
     defaultConfig {
         applicationId "org.billthefarmer.siggen"
-        minSdkVersion 21
+        minSdkVersion 23
         targetSdkVersion 31
-        versionName "1.35"
-        versionCode 135
+        versionName "1.36"
+        versionCode 136
 
         buildConfigField "long", "BUILT", System.currentTimeMillis() + "L"
     }
diff --git a/fastlane/metadata/android/en-GB/changelog/136.txt b/fastlane/metadata/android/en-GB/changelog/136.txt
new file mode 100644
index 0000000..173a86f
--- /dev/null
+++ b/fastlane/metadata/android/en-GB/changelog/136.txt
@@ -0,0 +1 @@
+ * Add Simplified Chinese translation
diff --git a/src/main/java/org/billthefarmer/siggen/Main.java b/src/main/java/org/billthefarmer/siggen/Main.java
index 62ddb86..091eb7f 100644
--- a/src/main/java/org/billthefarmer/siggen/Main.java
+++ b/src/main/java/org/billthefarmer/siggen/Main.java
@@ -34,6 +34,7 @@
 import android.content.res.Configuration;
 import android.content.res.TypedArray;
 import android.graphics.drawable.Drawable;
+import android.media.AudioAttributes;
 import android.media.AudioFormat;
 import android.media.AudioManager;
 import android.media.AudioTrack;
@@ -1204,6 +1205,8 @@ protected class Audio implements Runnable
         protected static final int SQUARE = 1;
         protected static final int SAWTOOTH = 2;
 
+        protected static final int SIZE = 8192;
+
         protected int waveform;
         protected boolean mute = false;
 
@@ -1256,32 +1259,22 @@ protected void processAudio()
         {
             short buffer[];
 
-            int rate =
-                AudioTrack.getNativeOutputSampleRate(AudioManager.STREAM_MUSIC);
-            int minSize =
-                AudioTrack.getMinBufferSize(rate, AudioFormat.CHANNEL_OUT_MONO,
-                                            AudioFormat.ENCODING_PCM_16BIT);
-
-            // Find a suitable buffer size
-            int sizes[] = {1024, 2048, 4096, 8192, 16384, 32768};
-            int size = 0;
-
-            for (int s: sizes)
-            {
-                if (s > minSize)
-                {
-                    size = s;
-                    break;
-                }
-            }
-
-            final double K = 2.0 * Math.PI / rate;
-
             // Create the audio track
-            audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, rate,
-                                        AudioFormat.CHANNEL_OUT_MONO,
-                                        AudioFormat.ENCODING_PCM_16BIT,
-                                        size, AudioTrack.MODE_STREAM);
+            audioTrack = new AudioTrack.Builder()
+                .setAudioAttributes
+                (new AudioAttributes.Builder()
+                 .setUsage(AudioAttributes.USAGE_MEDIA)
+                 .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+                 .build())
+                .setAudioFormat
+                (new AudioFormat.Builder()
+                 .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
+                 .setChannelMask(AudioFormat.CHANNEL_OUT_MONO)
+                 .build())
+                .build();
+
+            int rate = audioTrack.getSampleRate();
+            final double K = 2.0 * Math.PI / rate;
 
             // Check audioTrack state
             int state = audioTrack.getState();
@@ -1294,7 +1287,7 @@ protected void processAudio()
             audioTrack.play();
 
             // Create the buffer
-            buffer = new short[size];
+            buffer = new short[SIZE];
 
             // Initialise the generator variables
             double f = frequency;