diff --git a/Builds/MacOSX/Dexed.xcodeproj/project.xcworkspace/xcuserdata/asb2m10.xcuserdatad/UserInterfaceState.xcuserstate b/Builds/MacOSX/Dexed.xcodeproj/project.xcworkspace/xcuserdata/asb2m10.xcuserdatad/UserInterfaceState.xcuserstate
index c2e58df..81994d7 100644
Binary files a/Builds/MacOSX/Dexed.xcodeproj/project.xcworkspace/xcuserdata/asb2m10.xcuserdatad/UserInterfaceState.xcuserstate and b/Builds/MacOSX/Dexed.xcodeproj/project.xcworkspace/xcuserdata/asb2m10.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/Source/DXComponents.cpp b/Source/DXComponents.cpp
index a277af3..7f52049 100644
--- a/Source/DXComponents.cpp
+++ b/Source/DXComponents.cpp
@@ -198,6 +198,7 @@ void EnvDisplay::paint(Graphics &g) {
     g.drawText(len, 5, 1, 72, 14, Justification::left, true);
 }
 
+
 PitchEnvDisplay::PitchEnvDisplay() {
     pvalues = (char *) &TMP_LEVEL_PTR;
     vPos = 0;
@@ -253,8 +254,6 @@ void PitchEnvDisplay::paint(Graphics &g) {
     if ( vPos == i ) {
         g.fillEllipse(oldx-2, oldy-2, 4, 4);
     }
-    
-    TRACE("pitch pos %d", vPos);
 }
 
 
diff --git a/Source/DXLookNFeel.cpp b/Source/DXLookNFeel.cpp
index 272f249..ad955a2 100644
--- a/Source/DXLookNFeel.cpp
+++ b/Source/DXLookNFeel.cpp
@@ -20,6 +20,9 @@
  
 #include "DXLookNFeel.h"
 
+Colour DXLookNFeel::dxDarkBrown = Colour(0xFF0FC00F);
+Colour DXLookNFeel::dxLightBrown = Colour(0xFFA87B67);
+
 DXLookNFeel::DXLookNFeel() {
     setColour(TextButton::buttonColourId,Colour(0xFF0FC00F));
     setColour(Slider::rotarySliderOutlineColourId,Colour(0xFF0FC00F));
diff --git a/Source/DXLookNFeel.h b/Source/DXLookNFeel.h
index fe295fc..bdc85eb 100644
--- a/Source/DXLookNFeel.h
+++ b/Source/DXLookNFeel.h
@@ -25,6 +25,9 @@
 
 class DXLookNFeel : public LookAndFeel_V3 {
 public:
+    static Colour dxDarkBrown;
+    static Colour dxLightBrown;
+    
     DXLookNFeel();
 };
 
diff --git a/Source/OperatorEditor.cpp b/Source/OperatorEditor.cpp
index 7c98316..0cf1947 100644
--- a/Source/OperatorEditor.cpp
+++ b/Source/OperatorEditor.cpp
@@ -110,6 +110,7 @@ OperatorEditor::OperatorEditor ()
     khzDisplay->setJustificationType (Justification::centred);
     khzDisplay->setEditable (false, false, false);
     khzDisplay->setColour (Label::backgroundColourId, Colour (0x6a000000));
+    khzDisplay->setColour (Label::textColourId, Colours::white);
     khzDisplay->setColour (Label::outlineColourId, Colour (0x00000000));
     khzDisplay->setColour (TextEditor::textColourId, Colours::black);
     khzDisplay->setColour (TextEditor::backgroundColourId, Colour (0x00000000));
@@ -547,10 +548,10 @@ BEGIN_JUCER_METADATA
           style="Rotary" textBoxPos="NoTextBox" textBoxEditable="1" textBoxWidth="80"
           textBoxHeight="20" skewFactor="1"/>
   <LABEL name="khz" id="eb961eed8902a6fc" memberName="khzDisplay" virtualName=""
-         explicitFocusOrder="0" pos="32 8 88 16" bkgCol="6a000000" outlineCol="0"
-         edTextCol="ff000000" edBkgCol="0" labelText="1,000 kHz" editableSingleClick="0"
-         editableDoubleClick="0" focusDiscardsChanges="0" fontname="Default font"
-         fontsize="11" bold="0" italic="0" justification="36"/>
+         explicitFocusOrder="0" pos="32 8 88 16" bkgCol="6a000000" textCol="ffffffff"
+         outlineCol="0" edTextCol="ff000000" edBkgCol="0" labelText="1,000 kHz"
+         editableSingleClick="0" editableDoubleClick="0" focusDiscardsChanges="0"
+         fontname="Default font" fontsize="11" bold="0" italic="0" justification="36"/>
   <SLIDER name="detune" id="f093ec8defca2fc2" memberName="detune" virtualName=""
           explicitFocusOrder="0" pos="24 24 56 24" min="-7" max="7" int="1"
           style="LinearHorizontal" textBoxPos="NoTextBox" textBoxEditable="0"
diff --git a/Source/OperatorEditor.h b/Source/OperatorEditor.h
index 69b1f68..c870af9 100644
--- a/Source/OperatorEditor.h
+++ b/Source/OperatorEditor.h
@@ -59,6 +59,9 @@ public:
     void resized();
     void sliderValueChanged (Slider* sliderThatWasMoved);
     void comboBoxChanged (ComboBox* comboBoxThatHasChanged);
+
+
+
 private:
     //[UserVariables]   -- You can add your own custom variables in this section.
     //[/UserVariables]
diff --git a/Source/PluginData.cpp b/Source/PluginData.cpp
index 94ff5a2..035922f 100644
--- a/Source/PluginData.cpp
+++ b/Source/PluginData.cpp
@@ -26,10 +26,11 @@
 
 
 uint8_t sysexChecksum(const char *sysex) {
-    uint8_t sum = 0;
-    for (int i=0; i<4096; i++)
-        sum = (sum + sysex[i]) % (1 << 8);
-    return ((1 << 8) - sum);
+    int sum = 0;
+    int i;
+    
+    for (i = 0; i < 4096; sum -= sysex[i++]);
+    return sum & 0x7F;
 }
 
 void extractProgramNames(const char *block, StringArray &dest) {
@@ -127,14 +128,18 @@ void packProgram(uint8_t *dest, uint8_t *src, int idx, String name) {
  * This function normalize data that comes from corrupted sysex.
  * It used to avoid engine crashing upon extrem values
  */
-char normparm(char value, char max) {
-    if ( value <= max )
+char normparm(char value, char max, int id) {
+    if ( value <= max && value >= 0 )
         return value;
     
     // if this is beyond the max, we expect a 0-255 range, normalize this
     // to the expected return value; and this value as a random data.
     
-    return ((float)value)/255 * max;
+    value = abs(value);
+    
+    char v = ((float)value)/255 * max;
+
+    return v;
 }
 
 void DexedAudioProcessor::unpackProgram(int idx) {
@@ -144,7 +149,7 @@ void DexedAudioProcessor::unpackProgram(int idx) {
         // eg rate and level, brk pt, depth, scaling
 
         for(int i=0; i<11; i++) {
-            data[op * 21 + i] = normparm(bulk[op * 17 + i], 99);
+            data[op * 21 + i] = normparm(bulk[op * 17 + i], 99, i);
         }
 
         memcpy(data + op * 21, bulk + op * 17, 11);
@@ -165,10 +170,10 @@ void DexedAudioProcessor::unpackProgram(int idx) {
     }
 
     for (int i=0; i<8; i++)  {
-        data[126+i] = normparm(bulk[102+i], 99);
+        data[126+i] = normparm(bulk[102+i], 99, 126+i);
     }
-    data[134] = normparm(bulk[110], 31);
-
+    data[134] = normparm(bulk[110], 31, 134);
+    
     char oks_fb = bulk[111];
     data[135] = oks_fb & 7;
     data[136] = oks_fb >> 3;
@@ -193,14 +198,13 @@ int DexedAudioProcessor::importSysex(const char *imported) {
     extractProgramNames(sysex, programNames);
     
     if ( checksum != imported[4102] ) {
-        TRACE("sysex import checksum doesnt match");
+        TRACE("sysex import checksum doesnt match %d != %d", checksum, imported[4102]);
         return 1;
     }
     
     return 0;
 }
 
-
 void DexedAudioProcessor::updateProgramFromSysex(const uint8 *rawdata) {
     memcpy(data, rawdata, 160);
     triggerAsyncUpdate();
@@ -208,6 +212,7 @@ void DexedAudioProcessor::updateProgramFromSysex(const uint8 *rawdata) {
 
 void DexedAudioProcessor::loadBuiltin(int idx) {
     char syx_data[4104];
+    memset(&syx_data, 0, 4104);
     cartManager.getSysex(idx, (char *) &syx_data);
     importSysex((char *) &syx_data);
 }
diff --git a/Source/PluginProcessor.cpp b/Source/PluginProcessor.cpp
index 4d096b5..430916b 100644
--- a/Source/PluginProcessor.cpp
+++ b/Source/PluginProcessor.cpp
@@ -51,6 +51,8 @@ DexedAudioProcessor::DexedAudioProcessor() {
     setCurrentProgram(0);
     sendSysexChange = true;
     normalizeDxVelocity = false;
+
+    memset(&voiceStatus, 0, sizeof(VoiceStatus));
 }
 
 DexedAudioProcessor::~DexedAudioProcessor() {