diff --git a/usbcontroller.cpp b/usbcontroller.cpp
index 9091ee2b..59126483 100644
--- a/usbcontroller.cpp
+++ b/usbcontroller.cpp
@@ -363,6 +363,8 @@ void usbController::run()
                     dev.knobSend.append(0);
                 }
 
+                dev.knobPrevious.append(dev.knobValues);
+
                 // Find our defaults/knobs/buttons for this controller:
                 // First see if we have any stored and add them to the list if not.
 
@@ -764,7 +766,8 @@ void usbController::runTimer()
                 for (unsigned char i = 0; i < dev.knobValues.size(); i++) {
                     for (KNOB* kb = knobList->begin(); kb != knobList->end(); kb++) {
                         if (kb != knobList->end() && kb->command && kb->devicePath == dev.path && kb->num == i && dev.knobValues[i]) {
-                            COMMAND cmd(*kb->command);
+                            // sendCommand mustn't be deleted so we ensure it stays in-scope by declaring it private.
+                            sendCommand = *kb->command;
                             if (kb->num >0) {
                                 if (dev.knobSend[i] + (dev.knobValues[i] * 10) <= 0)
                                 {
@@ -777,14 +780,23 @@ void usbController::runTimer()
                                 else {
                                     dev.knobSend[i] = dev.knobSend[i] + (dev.knobValues[i] * 10);
                                 }
-                                cmd.suffix = dev.knobSend[i];
+                                sendCommand.suffix = dev.knobSend[i];
                             } else {
-                                cmd.value = dev.knobValues[i]/dev.sensitivity;
+                                int tempVal = dev.knobValues[i] * dev.sensitivity;
+                                tempVal = qMin(qMax(tempVal,0),255);
+                                sendCommand.suffix = quint8(tempVal);
+                                dev.knobValues[i]=tempVal/dev.sensitivity; // This ensures that dial can't go outside 0-255
                             }
 
-                            qInfo(logUsbControl()) << "Sending Knob:" << kb->num << "Command:" << cmd.command << " Value:" << cmd.suffix << "Raw value:" << dev.knobValues[i];
-                            emit button(&cmd);
-                            dev.knobValues[i] = 0;
+                            if (dev.knobValues[i] != dev.knobPrevious[i]) {
+                                emit button(&sendCommand);
+                            }
+
+                            if (sendCommand.command == cmdSetFreq) {
+                                dev.knobValues[i] = 0;
+                            } else {
+                                dev.knobPrevious[i]=dev.knobValues[i];
+                            }
                         }
                     }
                 }
diff --git a/usbcontroller.h b/usbcontroller.h
index 1e30be9f..63f4c718 100644
--- a/usbcontroller.h
+++ b/usbcontroller.h
@@ -78,6 +78,7 @@ struct USBDEVICE {
     quint32 buttons = 0;
     quint32 knobs = 0;
     QList<int> knobValues;
+    QList<int> knobPrevious;
     QList<quint8> knobSend;
     QTime lastusbController = QTime::currentTime();
     QByteArray lastData = QByteArray(8,0x0);
@@ -218,6 +219,7 @@ private:
     QColor currentColour;
 
     QMutex* mutex=Q_NULLPTR;
+    COMMAND sendCommand;
 
     unsigned short knownUsbDevices[6][5] = {
     {shuttleXpress,0x0b33,0x0020,0x0000,0x0000},
diff --git a/wfmain.cpp b/wfmain.cpp
index 33c29ad3..3116d4ff 100644
--- a/wfmain.cpp
+++ b/wfmain.cpp
@@ -1860,7 +1860,6 @@ void wfmain::buttonControl(const COMMAND* cmd)
     }
     default:
         issueCmdUniquePriority((cmds)cmd->command, cmd->suffix);
-        qInfo(logUsbControl()) << "Command fell through command:" << cmd->command << "suffix" << cmd->suffix;
         break;
     }
 }