diff --git a/src/davaguine/jeq/core/IIRBase.java b/src/davaguine/jeq/core/IIRBase.java
index b37e540..e557ac5 100644
--- a/src/davaguine/jeq/core/IIRBase.java
+++ b/src/davaguine/jeq/core/IIRBase.java
@@ -411,67 +411,68 @@ public class IIRBase {
             new IIRCoefficients(6.0884213704e-01, 1.9557893148e-01, -1.3932981614e+00),
     };
     public final static IIRCoefficients iir_cf31_96000[] = {
-            /* 20 Hz*/
-            new IIRCoefficients(9.9939388451e-01, 3.0305774630e-04, 1.9993870327e+00),
-            /* 25 Hz*/
-            new IIRCoefficients(9.9924247917e-01, 3.7876041632e-04, 1.9992317740e+00),
-            /* 31.5 Hz*/
-            new IIRCoefficients(9.9904564663e-01, 4.7717668529e-04, 1.9990286528e+00),
-            /* 40 Hz*/
-            new IIRCoefficients(9.9878827195e-01, 6.0586402557e-04, 1.9987608731e+00),
-            /* 50 Hz*/
-            new IIRCoefficients(9.9848556942e-01, 7.5721528829e-04, 1.9984427652e+00),
-            /* 63 Hz*/
-            new IIRCoefficients(9.9809219264e-01, 9.5390367779e-04, 1.9980242502e+00),
-            /* 80 Hz*/
-            new IIRCoefficients(9.9757801538e-01, 1.2109923088e-03, 1.9974684869e+00),
-            /* 100 Hz*/
-            new IIRCoefficients(9.9697343933e-01, 1.5132803374e-03, 1.9968023538e+00),
-            /* 125 Hz*/
-            new IIRCoefficients(9.9621823598e-01, 1.8908820086e-03, 1.9959510180e+00),
-            /* 160 Hz*/
-            new IIRCoefficients(9.9516191728e-01, 2.4190413595e-03, 1.9947243453e+00),
-            /* 200 Hz*/
-            new IIRCoefficients(9.9395607757e-01, 3.0219612131e-03, 1.9932727986e+00),
-            /* 250 Hz*/
-            new IIRCoefficients(9.9245085008e-01, 3.7745749576e-03, 1.9913840669e+00),
-            /* 315 Hz*/
-            new IIRCoefficients(9.9049749914e-01, 4.7512504310e-03, 1.9888056233e+00),
-            /* 400 Hz*/
-            new IIRCoefficients(9.8794899744e-01, 6.0255012789e-03, 1.9852245824e+00),
-            /* 500 Hz*/
-            new IIRCoefficients(9.8495930023e-01, 7.5203498850e-03, 1.9807093500e+00),
-            /* 630 Hz*/
-            new IIRCoefficients(9.8108651246e-01, 9.4567437704e-03, 1.9743538683e+00),
-            /* 800 Hz*/
-            new IIRCoefficients(9.7604570090e-01, 1.1977149551e-02, 1.9652207158e+00),
-            /* 1k Hz*/
-            new IIRCoefficients(9.7014963927e-01, 1.4925180364e-02, 1.9532947360e+00),
-            /* 1.25k Hz*/
-            new IIRCoefficients(9.6283181641e-01, 1.8584091793e-02, 1.9366149237e+00),
-            /* 1.6k Hz*/
-            new IIRCoefficients(9.5268463224e-01, 2.3657683878e-02, 1.9100137880e+00),
-            /* 2k Hz*/
-            new IIRCoefficients(9.4122788957e-01, 2.9386055213e-02, 1.8750821533e+00),
-            /* 2.5k Hz*/
-            new IIRCoefficients(9.2711765003e-01, 3.6441174983e-02, 1.8248457659e+00),
-            /* 3.15k Hz*/
-            new IIRCoefficients(9.0912548757e-01, 4.5437256213e-02, 1.7491177803e+00),
-            /* 4k Hz*/
-            new IIRCoefficients(8.8619860800e-01, 5.6900696000e-02, 1.6334959111e+00),
-            /* 5k Hz*/
-            new IIRCoefficients(8.6010264114e-01, 6.9948679430e-02, 1.4757186436e+00),
-            /* 6.3k Hz*/
-            new IIRCoefficients(8.2760520925e-01, 8.6197395374e-02, 1.2405797786e+00),
-            /* 8k Hz*/
-            new IIRCoefficients(7.8757448309e-01, 1.0621275845e-01, 8.9378724155e-01),
-            /* 10k Hz*/
-            new IIRCoefficients(7.4415362476e-01, 1.2792318762e-01, 4.5142017567e-01),
-            /* 12.5k Hz*/
-            new IIRCoefficients(6.9581428034e-01, 1.5209285983e-01, -1.1091156053e-01),
-            /* 16k Hz*/
-            new IIRCoefficients(6.4120506488e-01, 1.7939746756e-01, -8.2060253244e-01),
-            /* 20k Hz*/
-            new IIRCoefficients(6.0884213704e-01, 1.9557893148e-01, -1.3932981614e+00),
+/* 20 Hz */
+new IIRCoefficients(9.9918221139e-01, 4.0889430323e-04, 1.9991804986e+00),
+/* 25 Hz */
+new IIRCoefficients(9.9962373418e-01, 1.8813291151e-04, 1.9996210574e+00),
+/* 31.5 Hz */
+new IIRCoefficients(9.9950924659e-01, 2.4537670644e-04, 1.9995049971e+00),
+/* 40 Hz */
+new IIRCoefficients(9.9939477210e-01, 3.0261394841e-04, 1.9993879203e+00),
+/* 50 Hz */
+new IIRCoefficients(9.9924760988e-01, 3.7619506167e-04, 1.9992369047e+00),
+/* 63 Hz */
+new IIRCoefficients(9.9901873389e-01, 4.9063305250e-04, 1.9990017403e+00),
+/* 80 Hz */
+new IIRCoefficients(9.9878991029e-01, 6.0504485723e-04, 1.9987625114e+00),
+/* 100 Hz */
+new IIRCoefficients(9.9852846169e-01, 7.3576915625e-04, 1.9984856565e+00),
+/* 125 Hz */
+new IIRCoefficients(9.9803842973e-01, 9.8078513561e-04, 1.9979715632e+00),
+/* 160 Hz */
+new IIRCoefficients(9.9754863778e-01, 1.2256811083e-03, 1.9974391109e+00),
+/* 200 Hz */
+new IIRCoefficients(9.9705908562e-01, 1.4704571921e-03, 1.9968879927e+00),
+/* 250 Hz */
+new IIRCoefficients(9.9624369754e-01, 1.8781512307e-03, 1.9959764762e+00),
+/* 315 Hz */
+new IIRCoefficients(9.9510327003e-01, 2.4483649847e-03, 1.9946792773e+00),
+/* 400 Hz */
+new IIRCoefficients(9.9396414160e-01, 3.0179291997e-03, 1.9932808599e+00),
+/* 500 Hz */
+new IIRCoefficients(9.9250145198e-01, 3.7492740081e-03, 1.9914346418e+00),
+/* 630 Hz */
+new IIRCoefficients(9.9023040090e-01, 4.8847995509e-03, 1.9885387521e+00),
+/* 800 Hz */
+new IIRCoefficients(9.8796449555e-01, 6.0177522243e-03, 1.9852400593e+00),
+/* 1000 Hz */
+new IIRCoefficients(9.8538116034e-01, 7.3094198292e-03, 1.9811303069e+00),
+/* 1250 Hz */
+new IIRCoefficients(9.8055531891e-01, 9.7223405432e-03, 1.9739308353e+00),
+/* 1600 Hz */
+new IIRCoefficients(9.7575264994e-01, 1.2123675032e-02, 1.9649292702e+00),
+/* 2000 Hz */
+new IIRCoefficients(9.7097292946e-01, 1.4513535269e-02, 1.9541109828e+00),
+/* 2500 Hz */
+new IIRCoefficients(9.6305712557e-01, 1.8471437214e-02, 1.9368372235e+00),
+/* 3150 Hz */
+new IIRCoefficients(9.5207914671e-01, 2.3960426645e-02, 1.9107394812e+00),
+/* 4000 Hz */
+new IIRCoefficients(9.4122023318e-01, 2.9389883411e-02, 1.8750747578e+00),
+/* 5000 Hz */
+new IIRCoefficients(9.2742950588e-01, 3.6285247058e-02, 1.8251410716e+00),
+/* 6300 Hz */
+new IIRCoefficients(9.0634716904e-01, 4.6826415482e-02, 1.7465723184e+00),
+/* 8000 Hz */
+new IIRCoefficients(8.8569806727e-01, 5.7150966366e-02, 1.6330624302e+00),
+/* 10000 Hz */
+new IIRCoefficients(8.6260593228e-01, 6.8697033860e-02, 1.4777046382e+00),
+/* 12500 Hz */
+new IIRCoefficients(8.2067879086e-01, 8.9660604570e-02, 1.2446020061e+00),
+/* 16000 Hz */
+new IIRCoefficients(7.8040765969e-01, 1.0979617015e-01, 8.9020383015e-01),
+/* 20000 Hz */
+new IIRCoefficients(2.6794919254e-01, 3.6602540373e-01, 3.2816939955e-01),
+
     };
 }
diff --git a/src/uk/co/majenko/audiobookrecorder/Sentence.java b/src/uk/co/majenko/audiobookrecorder/Sentence.java
index 19a80e1..ecb668e 100644
--- a/src/uk/co/majenko/audiobookrecorder/Sentence.java
+++ b/src/uk/co/majenko/audiobookrecorder/Sentence.java
@@ -156,6 +156,38 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
         }
     }
 
+    public static final int FFTBuckets = 1024;
+
+    public double[][] getFFTProfile() {
+        double[] real = new double[FFTBuckets];
+        double[] imag = new double[FFTBuckets];
+
+        int[] samples = getAudioData();
+        int slices = (samples.length / FFTBuckets) + 1;
+
+        double[][] out = new double[slices][];
+
+        int slice = 0;
+
+        for (int i = 0; i < samples.length; i += FFTBuckets) {
+            for (int j = 0; j < FFTBuckets; j++) {
+                if (i + j < samples.length) {
+                    real[j] = samples[i+j] / 32768d;
+                    imag[j] = 0;
+                } else {
+                    real[j] = 0;
+                    imag[j] = 0;
+                }
+            }
+
+            out[slice++] = FFT.fft(real, imag, true);
+        }
+
+        return out;
+        
+        
+    }
+
     public void autoTrimSampleFFT() {
         crossStartOffset = -1;
         crossEndOffset = -1;
@@ -190,7 +222,7 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
 
             intens[block] = 0;
 
-            for (int j = 1; j < 2048; j++) {
+            for (int j = 2; j < 4096; j += 2) {
                 double d = Math.abs(av - buckets[j]);
                 if (d > 0.05) {
                     intens[block]++;
diff --git a/src/uk/co/majenko/audiobookrecorder/Waveform.java b/src/uk/co/majenko/audiobookrecorder/Waveform.java
index f3a0648..32735ea 100644
--- a/src/uk/co/majenko/audiobookrecorder/Waveform.java
+++ b/src/uk/co/majenko/audiobookrecorder/Waveform.java
@@ -9,6 +9,7 @@ import javax.sound.sampled.*;
 public class Waveform extends JPanel {
 
     int[] samples = null;
+
     int leftMarker = 0;
     int rightMarker = 0;
 
@@ -20,7 +21,6 @@ public class Waveform extends JPanel {
     }
 
     public void paintComponent(Graphics g) {
-
         Dimension size = getSize();
 
         int w = size.width;
@@ -140,4 +140,5 @@ public class Waveform extends JPanel {
         samples = s;
         repaint();
     }
+
 }