Released 0.2.2

ExampleFilters/alien.eff

@@ -1,7 +1,4 @@
 <effect name="Alien">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
-    <biquad type="lowpass" fc="10000" q="1" gain="-10" />
-    <lfo frequency="100" depth="0.5" />
+    <!--biquad type="lowpass" fc="10000" q="1" gain="-10" /-->
+    <lfo frequency="50" depth="1.0" waveform="triangle" mode="replace"/>
 </effect>

ExampleFilters/bigecho.eff

@@ -1,7 +1,4 @@
 <effect name="Big Echo">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
     <delayline>
         <delay samples="22000" gain="0.2" pan="-0.3">
             <biquad type="highpass" fc="300" q="1" gain="0" />

ExampleFilters/cuthumagc.eff

@@ -3,5 +3,5 @@
     <biquad type="notch" fc="91" q="20" gain="-50" />
     <biquad type="notch" fc="120" q="20" gain="-50" />
     <biquad type="lowpass" fc="10000" q="1" gain="-10" />
-    <agc ceiling="0.666" limit="1" attack="0.1" decay="0.01" />
+    <agc ceiling="0.666" limit="1.5" attack="0.08" decay="0.01" />
 </effect>

ExampleFilters/cuthumagcstereo.eff

@@ -0,0 +1,15 @@
+<effect name="Cut Computer Hum (with AGC and Stereo)">
+    <biquad type="notch" fc="28" q="20" gain="-50" />
+    <biquad type="notch" fc="91" q="20" gain="-50" />
+    <biquad type="notch" fc="120" q="20" gain="-50" />
+    <biquad type="lowpass" fc="10000" q="1" gain="-10" />
+    <delayline wetonly="false">
+        <delay samples="-100" gain="0.1" pan="-1.0">
+            <biquad type="highpass" fc="300" q="1" gain="0" />
+        </delay>
+        <delay samples="100" gain="0.1" pan="1.0">
+            <biquad type="highpass" fc="300" q="1" gain="0" />
+        </delay>
+    </delayline>
+    <agc ceiling="0.666" limit="1.5" attack="0.1" decay="0.01" />
+</effect>

ExampleFilters/ethereal.eff

@@ -1,7 +1,4 @@
 <effect name="Ethereal Voice">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
     <amplifier gain="0.1" />
     <delayline>
         <delay samples="2000" gain="1.0" pan="-0.3">

ExampleFilters/largeroom.eff

@@ -1,7 +1,4 @@
 <effect name="Large Room (quiet)">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
     <biquad type="lowpass" fc="10000" q="1" gain="-10" />
     <delayline>
         <delay samples="5500" gain="0.2" pan="-0.3">

ExampleFilters/largeroomloud.eff

@@ -1,7 +1,4 @@
 <effect name="Large Room (loud)">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
     <biquad type="lowpass" fc="10000" q="1" gain="-10" />
     <delayline>
         <delay samples="5500" gain="0.2" pan="-0.3">

ExampleFilters/panleft.eff

@@ -0,0 +1,3 @@
+<effect name="Pan Left">
+    <pan pan="-0.4" />
+</effect>

ExampleFilters/panright.eff

@@ -0,0 +1,3 @@
+<effect name="Pan Right">
+    <pan pan="0.4" />
+</effect>

ExampleFilters/phone.eff

@@ -1,7 +1,4 @@
 <effect name="Telephone">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
     <biquad type="lowshelf" fc="400" q="10" gain="-20" />
     <biquad type="highshelf" fc="8000" q="10" gain="-20" />
     <delayline>

ExampleFilters/radio.eff

@@ -1,14 +1,12 @@
 <effect name="Radio">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
-    <amplifier gain="0.1" />
-    <biquad type="peak" fc="1000" q="10" gain="45" />
-    <lfo frequency="5000" depth="0.3" />
-    <clipping clip="0.3" />
+    <amplifier gain="0.5" />
+    <biquad type="peak" fc="1000" q="10" gain="25" />
+    <lfo frequency="3000" depth="0.3" waveform="sine" mode="add" />
+    <clipping clip="0.9" />
     <biquad type="highshelf" fc="8000" q="1" gain="-20" />
     <delayline>
         <delay samples="100" gain="0.7" />
         <delay samples="200" gain="0.5" />
     </delayline>
+    <amplifier gain="0.3" />
 </effect>

ExampleFilters/robotic.eff

@@ -1,7 +1,4 @@
 <effect name="Robotic">
-    <biquad type="notch" fc="28" q="20" gain="-50" />
-    <biquad type="notch" fc="91" q="20" gain="-50" />
-    <biquad type="notch" fc="120" q="20" gain="-50" />
     <biquad type="lowshelf" fc="100" q="2" gain="-20" />
     <delayline>
         <delay samples="400" gain="1" pan="-0.3" />

ExampleFilters/stereochorus.eff

@@ -0,0 +1,10 @@
+<effect name="Stereo Chorus">
+    <delayline>
+        <delay samples="2000" gain="0.1" pan="-0.3">
+            <biquad type="highpass" fc="300" q="1" gain="0" />
+        </delay>
+        <delay samples="4000" gain="0.1" pan="0.3">
+            <biquad type="highpass" fc="300" q="1" gain="0" />
+        </delay>
+    </delayline>
+</effect>

resources/uk/co/majenko/audiobookrecorder/config.txt

@@ -1 +1 @@
-version=0.2.0
+version=0.2.2

src/uk/co/majenko/audiobookrecorder/AGC.java

@@ -47,6 +47,7 @@ public class AGC implements Effect {
 
             gain += factor;
             if (gain > limit) gain = limit;
+            if (gain < 0) gain = 0;
 
             samples[i][Sentence.LEFT] *= gain;
             samples[i][Sentence.RIGHT] *= gain;

src/uk/co/majenko/audiobookrecorder/AudiobookRecorder.java

@@ -30,8 +30,6 @@ public class AudiobookRecorder extends JFrame {
 
     // Settings - tweakable
 
-    public static final int PLAYBACK_CHUNK_SIZE = 1024;
-
     public static final String SPHINX_MODEL = "resource:/edu/cmu/sphinx/models/en-us/en-us";
 
     static Properties config = new Properties();
@@ -60,6 +58,7 @@ public class AudiobookRecorder extends JFrame {
 
     JMenuItem bookNewChapter;
     JMenuItem bookExportAudio;
+    JMenuItem bookPurgeBackups;
     JMenu bookVisitACX;
     JMenuItem bookVisitTitle;
     JMenuItem bookVisitAudition;
@@ -214,8 +213,16 @@ public class AudiobookRecorder extends JFrame {
             }
         });
 
+        bookPurgeBackups = new JMenuItem("Purge Backups");
+        bookPurgeBackups.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                book.purgeBackups();
+            }
+        });
+
         bookMenu.add(bookNewChapter);
         bookMenu.add(bookExportAudio);
+        bookMenu.add(bookPurgeBackups);
 
         bookVisitACX = new JMenu("Visit ACX");
         bookMenu.add(bookVisitACX);
@@ -1454,6 +1461,8 @@ public class AudiobookRecorder extends JFrame {
                         if (!(book.getName().equals(tit))) {
                             book.renameBook(tit);
                         }
+
+                        CacheManager.purgeCache();
                     }
                 });
                 menu.add(editData);
@@ -1814,16 +1823,10 @@ public class AudiobookRecorder extends JFrame {
             int i = 0;
             for (Enumeration s = c.children(); s.hasMoreElements();) {
                 Sentence snt = (Sentence)s.nextElement();
-                prefs.setProperty(String.format("%s.sentence.%08d.id", keybase, i), snt.getId());
-                prefs.setProperty(String.format("%s.sentence.%08d.text", keybase, i), snt.getText());
-                prefs.setProperty(String.format("%s.sentence.%08d.post-gap", keybase, i), Integer.toString(snt.getPostGap()));
-                prefs.setProperty(String.format("%s.sentence.%08d.start-offset", keybase, i), Integer.toString(snt.getStartOffset()));
-                prefs.setProperty(String.format("%s.sentence.%08d.end-offset", keybase, i), Integer.toString(snt.getEndOffset()));
-                prefs.setProperty(String.format("%s.sentence.%08d.locked", keybase, i), snt.isLocked() ? "true" : "false");
-                prefs.setProperty(String.format("%s.sentence.%08d.attention", keybase, i), snt.getAttentionFlag() ? "true" : "false");
-                prefs.setProperty(String.format("%s.sentence.%08d.gain", keybase, i), String.format("%.8f", snt.getGain()));
-                prefs.setProperty(String.format("%s.sentence.%08d.effect", keybase, i), snt.getEffectChain());
-                prefs.setProperty(String.format("%s.sentence.%08d.gaptype", keybase, i), snt.getPostGapType());
+                TreeMap<String, String> settings = snt.getSentenceData();
+                for (String key : settings.keySet()) {
+                    prefs.setProperty(String.format("%s.sentence.%08d.%s", keybase, i, key), settings.get(key));
+                }
                 i++;
             }
         }
@@ -2182,8 +2185,12 @@ public class AudiobookRecorder extends JFrame {
 
                 try {
 
+                    int blockSize = Options.getInteger("audio.playback.blocksize");
+
                     AudioFormat sampleformat = s.getAudioFormat();
-                    AudioFormat format = new AudioFormat(sampleformat.getSampleRate(), 16, 2, true, false);
+                    float sampleRate = sampleformat.getSampleRate();
+//                    sampleRate *= toolBar.getPlaybackSpeed();
+                    AudioFormat format = new AudioFormat(sampleRate, 16, 2, true, false);
             
                     play = AudioSystem.getSourceDataLine(format, Options.getPlaybackMixer());
                     play.open(format);
@@ -2192,10 +2199,10 @@ public class AudiobookRecorder extends JFrame {
 
                     bookTree.scrollPathToVisible(new TreePath(s.getPath()));
                     data = s.getPCMData(effectsEnabled);
-                    for (int pos = 0; pos < data.length; pos += PLAYBACK_CHUNK_SIZE) {
+                    for (int pos = 0; pos < data.length; pos += blockSize) {
                         sampleWaveform.setPlayMarker(pos / format.getFrameSize());
                         int l = data.length - pos;
-                        if (l > PLAYBACK_CHUNK_SIZE) l = PLAYBACK_CHUNK_SIZE;
+                        if (l > blockSize) l = blockSize;
                         play.write(data, pos, l);
                     }
 
@@ -2344,6 +2351,8 @@ public class AudiobookRecorder extends JFrame {
 
                 try {
 
+                    int blockSize = Options.getInteger("audio.playback.blocksize");
+
                     AudioFormat sampleformat = s.getAudioFormat();
                     AudioFormat format = new AudioFormat(sampleformat.getSampleRate(), 16, 2, true, false);
 
@@ -2375,10 +2384,10 @@ public class AudiobookRecorder extends JFrame {
                     if (startPos > data.length) startPos = data.length;
                     if (endPos > data.length) endPos = data.length;
 
-                    for (int pos = startPos; pos < endPos; pos += PLAYBACK_CHUNK_SIZE) {
+                    for (int pos = startPos; pos < endPos; pos += blockSize) {
                         sampleWaveform.setPlayMarker(pos / format.getFrameSize());
                         int l = data.length - pos;
-                        if (l > PLAYBACK_CHUNK_SIZE) l = PLAYBACK_CHUNK_SIZE;
+                        if (l > blockSize) l = blockSize;
                         play.write(data, pos, l);
                     }
 
@@ -2420,8 +2429,12 @@ public class AudiobookRecorder extends JFrame {
 
                 try {
 
+                    int blockSize = Options.getInteger("audio.playback.blocksize");
+
                     AudioFormat sampleformat = s.getAudioFormat();
-                    AudioFormat format = new AudioFormat(sampleformat.getSampleRate(), 16, 2, true, false);
+                    float sampleRate = sampleformat.getSampleRate();
+                    sampleRate *= toolBar.getPlaybackSpeed();
+                    AudioFormat format = new AudioFormat(sampleRate, 16, 2, true, false);
                     play = AudioSystem.getSourceDataLine(format, Options.getPlaybackMixer());
                     play.open(format);
                     play.start();
@@ -2451,10 +2464,10 @@ public class AudiobookRecorder extends JFrame {
                             });
                             t.start();
                         }
-                        for (int pos = 0; pos < data.length; pos += PLAYBACK_CHUNK_SIZE) {
+                        for (int pos = 0; pos < data.length; pos += blockSize) {
                             sampleWaveform.setPlayMarker(pos / format.getFrameSize());
                             int l = data.length - pos;
-                            if (l > PLAYBACK_CHUNK_SIZE) l = PLAYBACK_CHUNK_SIZE;
+                            if (l > blockSize) l = blockSize;
                             play.write(data, pos, l);
                         }
 
@@ -2470,12 +2483,6 @@ public class AudiobookRecorder extends JFrame {
                             play.write(data, 0, data.length);
                             playing = null;
                         } else {
-                            play.drain();
-                            play.stop();
-                            play.close();
-                            play.open(format);
-                            play.start();
-                            play.drain();
                             data = getRoomNoise(s.getPostGap());
                             play.write(data, 0, data.length);
                         }
@@ -3220,7 +3227,40 @@ public class AudiobookRecorder extends JFrame {
         double f = Utils.s2d(root.getAttribute("frequency"));
         double d = Utils.s2d(root.getAttribute("depth"));
         double p = Utils.s2d(root.getAttribute("phase"));
-        return new LFO(f, d, p);
+        double dty = Math.PI;
+        String waveform = root.getAttribute("waveform");
+        if (waveform == null) {
+            waveform = "sine";
+        }
+
+        int w = LFO.SINE;
+
+        switch (waveform.toLowerCase()) {
+            case "sine": w = LFO.SINE; break;
+            case "cosine": w = LFO.COSINE; break;
+            case "square": w = LFO.SQUARE; break;
+            case "triangle": w = LFO.TRIANGLE; break;
+            case "sawtooth": w = LFO.SAWTOOTH; break;
+        }
+
+        int m = LFO.ADD;
+
+        String mode = root.getAttribute("mode");
+
+        if (mode == null) {
+            mode = "add";
+        }
+
+        switch (mode.toLowerCase()) {
+            case "add": m = LFO.ADD; break;
+            case "replace": m = LFO.REPLACE; break;
+        }
+
+        if (root.getAttribute("duty") != null) {
+            int di = Utils.s2i(root.getAttribute("duty")); // 0-100;
+            dty = (Math.PI * 2) * ((double)di / 100d);
+        }
+        return new LFO(f, d, p, w, dty, m);
     }
 
     public AGC loadAGC(Element root) {
@@ -3369,6 +3409,9 @@ public class AudiobookRecorder extends JFrame {
             }
 
             newSentence.writeAudioData(startSamples);
+            newSentence.setPostGapType("continuation");
+            newSentence.setPostGap(Options.getInteger("catenation.short-sentence"));
+
             selectedSentence.writeAudioData(endSamples);
             selectedSentence.autoTrimSample();
             newSentence.autoTrimSample();

src/uk/co/majenko/audiobookrecorder/Book.java

@@ -206,4 +206,14 @@ public class Book extends DefaultMutableTreeNode {
         return out;
     }
 
+    public void purgeBackups() {
+        for (Enumeration o = children(); o.hasMoreElements();) {
+            Object ob = (Object)o.nextElement();
+            if (ob instanceof Chapter) {
+                Chapter c = (Chapter)ob;
+                c.purgeBackups();
+            }
+        }
+    }
+
 }

src/uk/co/majenko/audiobookrecorder/BookTreeRenderer.java

@@ -34,6 +34,10 @@ public class BookTreeRenderer extends DefaultTreeCellRenderer {
                 icn.add(Overlays.important, OverlayIcon.TOP_RIGHT);
             } 
 
+            if (s.getEndOffset() == s.getSampleSize() - 1) {
+                icn.add(Overlays.important, OverlayIcon.TOP_RIGHT);
+            }
+
             if (s.getEffectChain() != null) {
                 if (!s.getEffectChain().equals("none")) {
                     icn.add(Overlays.filter, OverlayIcon.BOTTOM_RIGHT);

src/uk/co/majenko/audiobookrecorder/CacheManager.java

@@ -34,4 +34,11 @@ public class CacheManager {
         cache.remove(c);
         c.clearCache();
     }
+
+    public static void purgeCache() {
+        for (Cacheable c : cache) {
+            c.clearCache();
+        }
+        cache.clear();
+    }
 }

src/uk/co/majenko/audiobookrecorder/Chapter.java

@@ -116,7 +116,7 @@ public class Chapter extends DefaultMutableTreeNode {
         audioAttributes.setCodec("libmp3lame");
         audioAttributes.setBitRate(Options.getInteger("audio.export.bitrate"));
         audioAttributes.setSamplingRate(Options.getInteger("audio.export.samplerate"));
-        audioAttributes.setChannels(2); //new Integer(2));
+        audioAttributes.setChannels(Options.getInteger("audio.export.channels")); //new Integer(2));
         attributes.setFormat("mp3");
         attributes.setAudioAttributes(audioAttributes);
 
@@ -239,4 +239,14 @@ public class Chapter extends DefaultMutableTreeNode {
         }
     }
 
+    public void purgeBackups() {
+        for (Enumeration o = children(); o.hasMoreElements();) {
+            Object ob = (Object)o.nextElement();
+            if (ob instanceof Sentence) {
+                Sentence s = (Sentence)ob;
+                s.purgeBackups();
+            }
+        }
+    }
+
 }

src/uk/co/majenko/audiobookrecorder/LFO.java

@@ -9,37 +9,73 @@ public class LFO implements Effect {
     double depth;
     double sampleRate;
     double sampleStep;
+    int waveform;
+    double duty;
+    int mode;
+
+    public static final int SINE = 0;
+    public static final int COSINE = 1;
+    public static final int SQUARE = 2;
+    public static final int TRIANGLE = 3;
+    public static final int SAWTOOTH = 4;
+
+    public static final int ADD = 0;
+    public static final int REPLACE = 1;
 
     public LFO(double f, double d) {
-        frequency = f;
-        depth = d;
-        phase = 0;
+        this(f, d, 0, SINE, Math.PI, REPLACE);
     }
 
     public LFO(double f, double d, double p) {
+        this(f, d, p, SINE, Math.PI, REPLACE);
+    }
+
+    public LFO(double f, double d, double p, int w) {
+        this(f, d, p, w, Math.PI, REPLACE);
+    }
+
+    public LFO(double f, double d, double p, int w, double dty) {
+        this(f, d, p, w, dty, REPLACE);
+    }
+
+    public LFO(double f, double d, double p, int w, double dty, int m) {
         frequency = f;
         depth = d;
         phase = p;
+        waveform = w;
+        duty = dty;
+        mode = m;
     }
 
     public void process(double[][] samples) {
         for (double[] sample : samples) {
-            double v = Math.sin(phase);
+            double v = 0;
+            switch (waveform) {
+                case SINE: v = Math.sin(phase); break;
+                case COSINE: v = Math.cos(phase); break;
+                case SQUARE: v = (phase > duty) ? 1d : 0d; break;
+                case TRIANGLE: v = (phase < Math.PI) ? (phase / Math.PI) : (1d - ((phase - Math.PI) / Math.PI)); break;
+                case SAWTOOTH: v = (phase / (Math.PI*2d)); break;
+            }
             phase += sampleStep;
             if (phase > (Math.PI * 2d)) {
                 phase -= (Math.PI * 2d);
             }
 
-//        // Make it between 0 and 1.
-//        v = 1d + v;
-//        v /= 2d;
-
             // Multiply it by the gain factor
             v *= depth;
 
             // Apply it to the sample
-            sample[Sentence.LEFT] += (sample[Sentence.LEFT] * v);
-            sample[Sentence.RIGHT] += (sample[Sentence.RIGHT] * v);
+            switch (mode) {
+                case REPLACE:
+                    sample[Sentence.LEFT] = (sample[Sentence.LEFT] * v);
+                    sample[Sentence.RIGHT] = (sample[Sentence.RIGHT] * v);
+                    break;
+                case ADD:
+                    sample[Sentence.LEFT] += (sample[Sentence.LEFT] * v);
+                    sample[Sentence.RIGHT] += (sample[Sentence.RIGHT] * v);
+                    break;
+            }
         }
     }
 

src/uk/co/majenko/audiobookrecorder/MainToolBar.java

@@ -19,6 +19,8 @@ public class MainToolBar extends JToolBar {
     JButtonSpacePlay eq;
     JToggleButtonSpacePlay mic;
 
+    JComboBox<String> playbackSpeed;
+
     JToggleButtonSpacePlay disableEffects;
 
     AudiobookRecorder root;
@@ -100,6 +102,7 @@ public class MainToolBar extends JToolBar {
         eq = new JButtonSpacePlay(Icons.eq, "Reload Effects", new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                 root.loadEffects();
+                CacheManager.purgeCache();
             }
         });
 
@@ -128,6 +131,7 @@ public class MainToolBar extends JToolBar {
                 }
             }
         });
+
         
         add(mic);
 
@@ -152,7 +156,20 @@ public class MainToolBar extends JToolBar {
 
         add(disableEffects);
 
+        addSeparator();
 
+        add(new JLabel("Playback speed: "));
+        playbackSpeed = new JComboBox<String>(new String[] {
+            "0.75x",
+            "1.00x",
+            "1.25x",
+            "1.50x",
+            "1.75x"
+        });
+        playbackSpeed.setFocusable(false);
+
+        playbackSpeed.setSelectedIndex(1);
+        add(playbackSpeed);
 
         setFloatable(false);
     }
@@ -161,4 +178,9 @@ public class MainToolBar extends JToolBar {
         playtoSentence.setEnabled(b);
     }
 
+    public float getPlaybackSpeed() {
+        int v = playbackSpeed.getSelectedIndex();
+        return 0.75f + (0.25f * v);
+    }
+
 }

src/uk/co/majenko/audiobookrecorder/Options.java

@@ -24,6 +24,8 @@ public class Options extends JDialog {
     JComboBox<KVPair> rateList;
     JComboBox<KVPair> bitDepth;
     JComboBox<KVPair> trimMethod;
+    JComboBox<KVPair> fftBlockSize;
+    JComboBox<KVPair> playbackBlockSize;
     JTextField storageFolder;
     JTextField archiveFolder;
     JSpinner preChapterGap;
@@ -34,6 +36,7 @@ public class Options extends JDialog {
     JSpinner postSectionGap;
     JTextField ffmpegLocation;
     JComboBox<KVPair> bitRate;
+    JComboBox<KVPair> channels;
     JComboBox<KVPair> exportRate;
     JCheckBox enableParsing;
     JSpinner cacheSize;
@@ -297,10 +300,12 @@ public class Options extends JDialog {
         bitDepth = addDropdown(optionsPanel, "Sample resolution:", getResolutionList(), get("audio.recording.resolution"));
         trimMethod = addDropdown(optionsPanel, "Auto-trim method:", getTrimMethods(), get("audio.recording.trim"));
         fftThreshold = addSpinner(optionsPanel, "FFT threshold:", 0, 100, 1, getInteger("audio.recording.trim.fft"), "");
+        fftBlockSize = addDropdown(optionsPanel, "FFT Block size:", getFFTBlockSizes(), get("audio.recording.trim.blocksize"));
 
         addSeparator(optionsPanel);
 
         playbackList = addDropdown(optionsPanel, "Playback device:", getPlaybackMixerList(), get("audio.playback.device"));
+        playbackBlockSize = addDropdown(optionsPanel, "Playback Block size:", getPlaybackBlockSizes(), get("audio.playback.blocksize"));
         addSeparator(optionsPanel);
         storageFolder = addFilePath(optionsPanel, "Storage folder:", get("path.storage"), true);
         archiveFolder = addFilePath(optionsPanel, "Archive folder:", get("path.archive"), true);
@@ -318,6 +323,7 @@ public class Options extends JDialog {
 
         ffmpegLocation = addFilePath(optionsPanel, "FFMPEG location:", get("path.ffmpeg"), false);
         bitRate = addDropdown(optionsPanel, "Export bitrate:", getBitrates(), get("audio.export.bitrate"));
+        channels = addDropdown(optionsPanel, "Export channels:", getChannelCountList(), get("audio.export.channels"));
         exportRate = addDropdown(optionsPanel, "Export sample rate:", getSampleRateList(), get("audio.export.samplerate"));
         
 
@@ -565,6 +571,8 @@ public class Options extends JDialog {
         } else {
             defaultPrefs.put("audio.playback.device", "");
         }
+        defaultPrefs.put("audio.recording.trim.blocksize", "4096");
+        defaultPrefs.put("audio.playback.blocksize", "4096");
 
         defaultPrefs.put("catenation.pre-chapter", "1000");
         defaultPrefs.put("catenation.post-chapter", "1500");
@@ -580,6 +588,7 @@ public class Options extends JDialog {
         defaultPrefs.put("path.ffmpeg", "");
 
         defaultPrefs.put("audio.export.bitrate", "256000");
+        defaultPrefs.put("audio.export.channels", "2");
         defaultPrefs.put("audio.export.samplerate", "44100");
         defaultPrefs.put("process.sphinx", "false");
 
@@ -703,11 +712,14 @@ public class Options extends JDialog {
         set("catenation.post-paragraph", postParagraphGap.getValue());
         set("catenation.post-section", postSectionGap.getValue());
         set("audio.export.bitrate", ((KVPair)bitRate.getSelectedItem()).key);
+        set("audio.export.channels", ((KVPair)channels.getSelectedItem()).key);
         set("audio.export.samplerate", ((KVPair)exportRate.getSelectedItem()).key);
         set("process.sphinx", enableParsing.isSelected());
         set("editor.external", externalEditor.getText());
         set("cache.size", cacheSize.getValue());
         set("audio.recording.trim.fft", fftThreshold.getValue());
+        set("audio.recording.trim.blocksize", ((KVPair)fftBlockSize.getSelectedItem()).key);
+        set("audio.playback.blocksize", ((KVPair)playbackBlockSize.getSelectedItem()).key);
 
         set("effects.ethereal.offset", etherealOffset.getValue());
         set("effects.ethereal.iterations", etherealIterations.getValue());
@@ -782,6 +794,31 @@ public class Options extends JDialog {
         return pairs;
     }
 
+    public static KVPair[] getFFTBlockSizes() {
+        KVPair[] pairs = new KVPair[8];
+        pairs[0] = new KVPair<String, String>("1024", "1024");
+        pairs[1] = new KVPair<String, String>("2048", "2048");
+        pairs[2] = new KVPair<String, String>("4096", "4096");
+        pairs[3] = new KVPair<String, String>("8192", "8192");
+        pairs[4] = new KVPair<String, String>("16384", "16384");
+        pairs[5] = new KVPair<String, String>("32768", "32768");
+        pairs[6] = new KVPair<String, String>("65536", "65537");
+        pairs[7] = new KVPair<String, String>("131072", "131072");
+        return pairs;
+    }
+
+    public static KVPair[] getPlaybackBlockSizes() {
+        KVPair[] pairs = new KVPair[8];
+        pairs[0] = new KVPair<String, String>("1024", "1024");
+        pairs[1] = new KVPair<String, String>("2048", "2048");
+        pairs[2] = new KVPair<String, String>("4096", "4096");
+        pairs[3] = new KVPair<String, String>("8192", "8192");
+        pairs[4] = new KVPair<String, String>("16384", "16384");
+        pairs[5] = new KVPair<String, String>("32768", "32768");
+        pairs[6] = new KVPair<String, String>("65536", "65537");
+        pairs[7] = new KVPair<String, String>("131072", "131072");
+        return pairs;
+    }
 
     public static void createEffectChains() {
         effectChains = new ArrayList<EffectGroup>();

src/uk/co/majenko/audiobookrecorder/Sentence.java

@@ -31,7 +31,7 @@ import java.util.Timer;
 
 
 public class Sentence extends DefaultMutableTreeNode implements Cacheable {
-    
+
     String text;
     String id;
     int postGap;
@@ -225,17 +225,18 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
             return;
         }
 
+        int fftSize = Options.getInteger("audio.recording.trim.blocksize");
 
-        int blocks = samples.length / 4096 + 1;
+        int blocks = samples.length / fftSize + 1;
 
         int[] intens = new int[blocks];
         int block = 0;
 
-        for (int i = 0; i < samples.length; i+= 4096) {
-            double[] real = new double[4096];
-            double[] imag = new double[4096];
+        for (int i = 0; i < samples.length; i+= fftSize) {
+            double[] real = new double[fftSize];
+            double[] imag = new double[fftSize];
 
-            for (int j = 0; j < 4096; j++) {
+            for (int j = 0; j < fftSize; j++) {
                 if (i + j < samples.length) {
                     real[j] = (samples[i+j][LEFT] + samples[i+j][RIGHT]) / 2d;
                     imag[j] = 0;
@@ -247,14 +248,14 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
 
             double[] buckets = FFT.fft(real, imag, true);
             double av = 0;
-            for (int j = 1; j < 2048; j++) {
+            for (int j = 1; j < fftSize/2; j++) {
                 av += Math.abs(buckets[j]);
             }
-            av /= 2047d;
+            av /= (fftSize / 2);
 
             intens[block] = 0;
 
-            for (int j = 2; j < 4096; j += 2) {
+            for (int j = 2; j < fftSize; j += 2) {
                 double d = Math.abs(av - buckets[j]);
                 if (d > 0.05) {
                     intens[block]++;
@@ -278,7 +279,7 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
             start = 0;
         }
 
-        startOffset = start * 4096;
+        startOffset = start * fftSize;
         if (startOffset < 0) startOffset = 0;
         if (startOffset >= samples.length) startOffset = samples.length;
 
@@ -295,9 +296,9 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
             end = blocks - 1;
         }
 
-        endOffset = end * 4096;
+        endOffset = (end+1) * fftSize;
 
-        if (endOffset <= startOffset) endOffset = startOffset + 4096;
+        if (endOffset <= startOffset) endOffset = startOffset + fftSize;
         if (endOffset < 0) endOffset = 0;
         if (endOffset >= samples.length) endOffset = samples.length;
         updateCrossings(useRaw);
@@ -337,7 +338,8 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
             startOffset = 0;
         }
 
-        startOffset -= 4096;
+        int fftSize = Options.getInteger("audio.recording.trim.blocksize");
+        startOffset -= fftSize;
 
         for (int i = samples.length-1; i >= 0; i--) {
             endOffset = i;
@@ -348,9 +350,9 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
             }
         }
 
-        endOffset += 4096;
+        endOffset += fftSize;
 
-        if (endOffset <= startOffset) endOffset = startOffset + 4096;
+        if (endOffset <= startOffset) endOffset = startOffset + fftSize;
         if (endOffset <= 0) {
             endOffset = samples.length-1;
         }
@@ -1308,4 +1310,35 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
     public void debug(String txt) {
         Debug.debug(String.format("%s: %s", id, txt));
     }
+
+    public TreeMap<String, String> getSentenceData() {
+
+        TreeMap<String, String> out = new TreeMap<String, String>();
+
+        out.put("id", getId());
+        out.put("text", getText());
+        out.put("post-gap", Integer.toString(getPostGap()));
+        out.put("start-offset", Integer.toString(getStartOffset()));
+        out.put("end-offset", Integer.toString(getEndOffset()));
+        out.put("locked", isLocked() ? "true" : "false");
+        out.put("attention", getAttentionFlag() ? "true" : "false");
+        out.put("gain", String.format("%.8f", getGain()));
+        out.put("effect", getEffectChain());
+        out.put("gaptype", getPostGapType());
+
+        return out;
+    }
+
+    public void purgeBackups() {
+        File whereto = getFile().getParentFile();
+        String name = getFile().getName();
+
+        File[] files = whereto.listFiles();
+        for (File f : files) {
+            String fn = f.getName();
+            if (fn.startsWith("backup-") && fn.endsWith("-" + name)) {
+                f.delete();
+            }
+        }
+    }
 }

src/uk/co/majenko/audiobookrecorder/Waveform.java

@@ -97,6 +97,7 @@ public class Waveform extends JPanel implements MouseListener, MouseMotionListen
                 double lmax = 0;
 
                 for (int o = 0; o < step; o++) {
+                    if (offset + (n * step) + o >= samples.length) break;
                     double sample = (samples[offset + (n * step) + o][Sentence.LEFT] + samples[offset + (n * step) + o][Sentence.RIGHT]) / 2d;
                     if (sample >= 0) {
                         have += sample;