diff --git a/src/uk/co/majenko/audiobookrecorder/AudiobookRecorder.java b/src/uk/co/majenko/audiobookrecorder/AudiobookRecorder.java
index 207070b..00ad492 100644
--- a/src/uk/co/majenko/audiobookrecorder/AudiobookRecorder.java
+++ b/src/uk/co/majenko/audiobookrecorder/AudiobookRecorder.java
@@ -315,12 +315,18 @@ public class AudiobookRecorder extends JFrame implements DocumentListener {
 
         CLI.addParameter("debug", "", Boolean.class, "Enable debug output");
         CLI.addParameter("trace", "", Boolean.class, "Enable function tracing");
+        CLI.addParameter("opengl", "", Boolean.class, "Enable OpenGL graphical acceleration");
 
         String[] argv = CLI.process(args);
 
         Debug.debugEnabled = CLI.isSet("debug");
         Debug.traceEnabled = CLI.isSet("trace");
 
+        if (CLI.isSet("opengl")) {
+            Properties props = System.getProperties();
+            props.setProperty("sun.java2d.opengl", "true");
+        }
+
         processQueue = new ArrayDeque<Runnable>();
 
         try {
@@ -1080,8 +1086,6 @@ public class AudiobookRecorder extends JFrame implements DocumentListener {
 
     public static void main(String args[]) {
         Debug.trace();
-        Properties props = System.getProperties();
-        props.setProperty("sun.java2d.opengl", "true");
         try {
             config.load(AudiobookRecorder.class.getResourceAsStream("config.txt"));
         } catch (Exception e) {
diff --git a/src/uk/co/majenko/audiobookrecorder/Options.java b/src/uk/co/majenko/audiobookrecorder/Options.java
index e1af282..cf4aef7 100644
--- a/src/uk/co/majenko/audiobookrecorder/Options.java
+++ b/src/uk/co/majenko/audiobookrecorder/Options.java
@@ -522,6 +522,10 @@ public class Options extends JDialog {
         validFormats.add(new AudioFormat(96000f, 16, 2, true, false));
         validFormats.add(new AudioFormat(96000f, 24, 1, true, false));
         validFormats.add(new AudioFormat(96000f, 24, 2, true, false));
+        validFormats.add(new AudioFormat(192000f, 16, 1, true, false));
+        validFormats.add(new AudioFormat(192000f, 16, 2, true, false));
+        validFormats.add(new AudioFormat(192000f, 24, 1, true, false));
+        validFormats.add(new AudioFormat(192000f, 24, 2, true, false));
 
         Mixer.Info[] info = AudioSystem.getMixerInfo();
         for (Mixer.Info i : info) {
@@ -554,10 +558,11 @@ public class Options extends JDialog {
     }
 
     static KVPair[] getSampleRateList() {
-        KVPair[] l = new KVPair[3];
+        KVPair[] l = new KVPair[4];
         l[0] = new KVPair<String, String>("44100", "44100");
         l[1] = new KVPair<String, String>("48000", "48000");
         l[2] = new KVPair<String, String>("96000", "96000");
+        l[2] = new KVPair<String, String>("192000", "192000");
         return l;
     }
 
@@ -789,9 +794,10 @@ public class Options extends JDialog {
     }
 
     public static KVPair[] getResolutionList() {
-        KVPair[] pairs = new KVPair[2];
+        KVPair[] pairs = new KVPair[3];
         pairs[0] = new KVPair<String, String>("16", "16 Bit");
         pairs[1] = new KVPair<String, String>("24", "24 Bit");
+        pairs[1] = new KVPair<String, String>("32", "32 Bit");
         return pairs;
     }
 
diff --git a/src/uk/co/majenko/audiobookrecorder/Sentence.java b/src/uk/co/majenko/audiobookrecorder/Sentence.java
index b7a0cbe..a8bdba5 100644
--- a/src/uk/co/majenko/audiobookrecorder/Sentence.java
+++ b/src/uk/co/majenko/audiobookrecorder/Sentence.java
@@ -133,7 +133,10 @@ public class Sentence extends BookTreeNode implements Cacheable {
             try {
                 running = true;
                 recording = true;
-                byte[] buf = new byte[1024]; //AudiobookRecorder.window.microphone.getBufferSize()];
+
+                final int numFrames = 512;
+                final int bufSize = numFrames * format.getFrameSize();
+                byte[] buf = new byte[bufSize]; //AudiobookRecorder.window.microphone.getBufferSize()];
                 FileOutputStream fos = new FileOutputStream(tempFile);
                 int len = 0;
                 Microphone.flush();