diff --git a/plugins/samplesource/fcdproplus/fcdproplusgui.cpp b/plugins/samplesource/fcdproplus/fcdproplusgui.cpp
index 87af8db2d..aed9efbeb 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusgui.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplusgui.cpp
@@ -94,6 +94,7 @@ void FCDProPlusGui::resetToDefaults()
 {
 	m_settings.resetToDefaults();
 	displaySettings();
+    m_forceSettings = true;
 	sendSettings();
 }
 
@@ -129,7 +130,13 @@ bool FCDProPlusGui::handleMessage(const Message& message)
     if (FCDProPlusInput::MsgConfigureFCDProPlus::match(message))
     {
         const FCDProPlusInput::MsgConfigureFCDProPlus& cfg = (FCDProPlusInput::MsgConfigureFCDProPlus&) message;
-        m_settings = cfg.getSettings();
+
+        if (cfg.getForce()) {
+            m_settings = cfg.getSettings();
+        } else {
+            m_settings.applySettings(cfg.getSettingsKeys(), cfg.getSettings());
+        }
+
         blockApplySettings(true);
         displaySettings();
         blockApplySettings(false);
@@ -236,6 +243,7 @@ void FCDProPlusGui::sendSettings()
 void FCDProPlusGui::on_centerFrequency_changed(quint64 value)
 {
 	m_settings.m_centerFrequency = value * 1000;
+    m_settingsKeys.append("centerFrequency");
 	sendSettings();
 }
 
@@ -246,6 +254,7 @@ void FCDProPlusGui::on_decim_currentIndexChanged(int index)
 	}
 
 	m_settings.m_log2Decim = index;
+    m_settingsKeys.append("log2Decim");
 	sendSettings();
 }
 
@@ -253,12 +262,15 @@ void FCDProPlusGui::on_fcPos_currentIndexChanged(int index)
 {
 	if (index == 0) {
 		m_settings.m_fcPos = FCDProPlusSettings::FC_POS_INFRA;
+        m_settingsKeys.append("fcPos");
 		sendSettings();
 	} else if (index == 1) {
 		m_settings.m_fcPos = FCDProPlusSettings::FC_POS_SUPRA;
+        m_settingsKeys.append("fcPos");
 		sendSettings();
 	} else if (index == 2) {
 		m_settings.m_fcPos = FCDProPlusSettings::FC_POS_CENTER;
+        m_settingsKeys.append("fcPos");
 		sendSettings();
 	}
 }
@@ -266,20 +278,23 @@ void FCDProPlusGui::on_fcPos_currentIndexChanged(int index)
 void FCDProPlusGui::on_dcOffset_toggled(bool checked)
 {
 	m_settings.m_dcBlock = checked;
+    m_settingsKeys.append("dcBlock");
 	sendSettings();
 }
 
 void FCDProPlusGui::on_iqImbalance_toggled(bool checked)
 {
 	m_settings.m_iqImbalance = checked;
+    m_settingsKeys.append("iqImbalance");
 	sendSettings();
 }
 
 void FCDProPlusGui::updateHardware()
 {
-	FCDProPlusInput::MsgConfigureFCDProPlus* message = FCDProPlusInput::MsgConfigureFCDProPlus::create(m_settings, m_forceSettings);
+	FCDProPlusInput::MsgConfigureFCDProPlus* message = FCDProPlusInput::MsgConfigureFCDProPlus::create(m_settings, m_settingsKeys, m_forceSettings);
 	m_sampleSource->getInputMessageQueue()->push(message);
 	m_forceSettings = false;
+    m_settingsKeys.clear();
 	m_updateTimer.stop();
 }
 
@@ -315,30 +330,35 @@ void FCDProPlusGui::updateStatus()
 void FCDProPlusGui::on_checkBoxG_stateChanged(int state)
 {
 	m_settings.m_lnaGain = (state == Qt::Checked);
+    m_settingsKeys.append("lnaGain");
 	sendSettings();
 }
 
 void FCDProPlusGui::on_checkBoxB_stateChanged(int state)
 {
 	m_settings.m_biasT = (state == Qt::Checked);
+    m_settingsKeys.append("biasT");
 	sendSettings();
 }
 
 void FCDProPlusGui::on_mixGain_stateChanged(int state)
 {
 	m_settings.m_mixGain = (state == Qt::Checked);
+    m_settingsKeys.append("mixGain");
 	sendSettings();
 }
 
 void FCDProPlusGui::on_filterIF_currentIndexChanged(int index)
 {
 	m_settings.m_ifFilterIndex = index;
+    m_settingsKeys.append("ifFilterIndex");
 	sendSettings();
 }
 
 void FCDProPlusGui::on_filterRF_currentIndexChanged(int index)
 {
 	m_settings.m_rfFilterIndex = index;
+    m_settingsKeys.append("rfFilterIndex");
 	sendSettings();
 }
 
@@ -346,6 +366,7 @@ void FCDProPlusGui::on_ifGain_valueChanged(int value)
 {
 	m_settings.m_ifGain = value;
 	displaySettings();
+    m_settingsKeys.append("ifGain");
 	sendSettings();
 }
 
@@ -353,6 +374,7 @@ void FCDProPlusGui::on_ppm_valueChanged(int value)
 {
 	m_settings.m_LOppmTenths = value;
 	displaySettings();
+    m_settingsKeys.append("LOppmTenths");
 	sendSettings();
 }
 
@@ -370,6 +392,10 @@ void FCDProPlusGui::on_transverter_clicked()
     qDebug("FCDProPlusGui::on_transverter_clicked: %lld Hz %s", m_settings.m_transverterDeltaFrequency, m_settings.m_transverterMode ? "on" : "off");
     updateFrequencyLimits();
     m_settings.m_centerFrequency = ui->centerFrequency->getValueNew()*1000;
+    m_settingsKeys.append("transverterMode");
+    m_settingsKeys.append("transverterDeltaFrequency");
+    m_settingsKeys.append("iqOrder");
+    m_settingsKeys.append("centerFrequency");
     sendSettings();
 }
 
@@ -390,6 +416,10 @@ void FCDProPlusGui::openDeviceSettingsDialog(const QPoint& p)
         m_settings.m_reverseAPIAddress = dialog.getReverseAPIAddress();
         m_settings.m_reverseAPIPort = dialog.getReverseAPIPort();
         m_settings.m_reverseAPIDeviceIndex = dialog.getReverseAPIDeviceIndex();
+        m_settingsKeys.append("useReverseAPI");
+        m_settingsKeys.append("reverseAPIAddress");
+        m_settingsKeys.append("reverseAPIPort");
+        m_settingsKeys.append("reverseAPIDeviceIndex");
 
         sendSettings();
     }
diff --git a/plugins/samplesource/fcdproplus/fcdproplusgui.h b/plugins/samplesource/fcdproplus/fcdproplusgui.h
index 9cbae0f75..a0226de56 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusgui.h
+++ b/plugins/samplesource/fcdproplus/fcdproplusgui.h
@@ -51,6 +51,7 @@ private:
 	bool m_doApplySettings;
 	bool m_forceSettings;
 	FCDProPlusSettings m_settings;
+    QList<QString> m_settingsKeys;
 	QTimer m_updateTimer;
 	QTimer m_statusTimer;
 	std::vector<int> m_gains;
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
index de4d80fd4..a77bb1401 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
@@ -111,7 +111,7 @@ bool FCDProPlusInput::openDevice()
 
 void FCDProPlusInput::init()
 {
-    applySettings(m_settings, true);
+    applySettings(m_settings, QList<QString>(), true);
 }
 
 bool FCDProPlusInput::start()
@@ -148,7 +148,7 @@ bool FCDProPlusInput::start()
 	m_FCDThread->startWork();
 
 //	mutexLocker.unlock();
-	applySettings(m_settings, true);
+	applySettings(m_settings, QList<QString>(), true);
 
 	qDebug("FCDProPlusInput::started");
 	m_running = true;
@@ -227,12 +227,12 @@ bool FCDProPlusInput::deserialize(const QByteArray& data)
         success = false;
     }
 
-    MsgConfigureFCDProPlus* message = MsgConfigureFCDProPlus::create(m_settings, true);
+    MsgConfigureFCDProPlus* message = MsgConfigureFCDProPlus::create(m_settings, QList<QString>(), true);
     m_inputMessageQueue.push(message);
 
     if (m_guiMessageQueue)
     {
-        MsgConfigureFCDProPlus* messageToGUI = MsgConfigureFCDProPlus::create(m_settings, true);
+        MsgConfigureFCDProPlus* messageToGUI = MsgConfigureFCDProPlus::create(m_settings, QList<QString>(), true);
         m_guiMessageQueue->push(messageToGUI);
     }
 
@@ -259,12 +259,12 @@ void FCDProPlusInput::setCenterFrequency(qint64 centerFrequency)
     FCDProPlusSettings settings = m_settings;
     settings.m_centerFrequency = centerFrequency;
 
-    MsgConfigureFCDProPlus* message = MsgConfigureFCDProPlus::create(settings, false);
+    MsgConfigureFCDProPlus* message = MsgConfigureFCDProPlus::create(settings, QList<QString>{"centerFrequency"}, false);
     m_inputMessageQueue.push(message);
 
     if (m_guiMessageQueue)
     {
-        MsgConfigureFCDProPlus* messageToGUI = MsgConfigureFCDProPlus::create(settings, false);
+        MsgConfigureFCDProPlus* messageToGUI = MsgConfigureFCDProPlus::create(settings, QList<QString>{"centerFrequency"}, false);
         m_guiMessageQueue->push(messageToGUI);
     }
 }
@@ -275,7 +275,7 @@ bool FCDProPlusInput::handleMessage(const Message& message)
 	{
 		qDebug() << "FCDProPlusInput::handleMessage: MsgConfigureFCD";
 		MsgConfigureFCDProPlus& conf = (MsgConfigureFCDProPlus&) message;
-		applySettings(conf.getSettings(), conf.getForce());
+		applySettings(conf.getSettings(), conf.getSettingsKeys(), conf.getForce());
 		return true;
 	}
     else if (MsgStartStop::match(message))
@@ -285,8 +285,7 @@ bool FCDProPlusInput::handleMessage(const Message& message)
 
         if (cmd.getStartStop())
         {
-            if (m_deviceAPI->initDeviceEngine())
-            {
+            if (m_deviceAPI->initDeviceEngine()) {
                 m_deviceAPI->startDeviceEngine();
             }
         }
@@ -307,30 +306,17 @@ bool FCDProPlusInput::handleMessage(const Message& message)
 	}
 }
 
-void FCDProPlusInput::applySettings(const FCDProPlusSettings& settings, bool force)
+void FCDProPlusInput::applySettings(const FCDProPlusSettings& settings, const QList<QString>& settingsKeys, bool force)
 {
+    qDebug() << "FCDProPlusInput::applySettings: force: " << force << settings.getDebugString(settingsKeys, force);
 	bool forwardChange = false;
-    QList<QString> reverseAPIKeys;
 
-    if (force || (m_settings.m_centerFrequency != settings.m_centerFrequency)) {
-        reverseAPIKeys.append("centerFrequency");
-    }
-    if (force || (m_settings.m_transverterMode != settings.m_transverterMode)) {
-        reverseAPIKeys.append("transverterMode");
-    }
-    if (force || (m_settings.m_transverterDeltaFrequency != settings.m_transverterDeltaFrequency)) {
-        reverseAPIKeys.append("transverterDeltaFrequency");
-    }
-	if ((m_settings.m_LOppmTenths != settings.m_LOppmTenths) || force) {
-		reverseAPIKeys.append("LOppmTenths");
-    }
-
-	if (force || (m_settings.m_centerFrequency != settings.m_centerFrequency)
-        || (m_settings.m_LOppmTenths != settings.m_LOppmTenths)
-        || (m_settings.m_fcPos != settings.m_fcPos)
-        || (m_settings.m_log2Decim != settings.m_log2Decim)
-        || (m_settings.m_transverterMode != settings.m_transverterMode)
-        || (m_settings.m_transverterDeltaFrequency != settings.m_transverterDeltaFrequency))
+	if (force || settingsKeys.contains("centerFrequency")
+        || settingsKeys.contains("LOppmTenths")
+        || settingsKeys.contains("fcPos")
+        || settingsKeys.contains("log2Decim")
+        || settingsKeys.contains("transverterMode")
+        || settingsKeys.contains("transverterDeltaFrequency"))
 	{
         qint64 deviceCenterFrequency = DeviceSampleSource::calculateDeviceCenterFrequency(
                 settings.m_centerFrequency,
@@ -353,9 +339,8 @@ void FCDProPlusInput::applySettings(const FCDProPlusSettings& settings, bool for
         m_settings.m_centerFrequency = settings.m_centerFrequency;
 	}
 
-	if ((m_settings.m_log2Decim != settings.m_log2Decim) || force)
+	if (settingsKeys.contains("log2Decim") || force)
 	{
-        reverseAPIKeys.append("log2Decim");
 		forwardChange = true;
 
 		if (m_FCDThread)
@@ -365,10 +350,8 @@ void FCDProPlusInput::applySettings(const FCDProPlusSettings& settings, bool for
 		}
 	}
 
-    if ((m_settings.m_fcPos != settings.m_fcPos) || force)
+    if (settingsKeys.contains("fcPos") || force)
     {
-        reverseAPIKeys.append("fcPos");
-
         if (m_FCDThread) {
             m_FCDThread->setFcPos((int) settings.m_fcPos);
         }
@@ -376,10 +359,8 @@ void FCDProPlusInput::applySettings(const FCDProPlusSettings& settings, bool for
         qDebug() << "FCDProPlusInput::applySettings: set fc pos (enum) to " << (int) settings.m_fcPos;
     }
 
-    if ((m_settings.m_iqOrder != settings.m_iqOrder) || force)
+    if (settingsKeys.contains("iqOrder") || force)
     {
-        reverseAPIKeys.append("iqOrder");
-
         if (m_FCDThread) {
             m_FCDThread->setIQOrder((int) settings.m_iqOrder);
         }
@@ -387,82 +368,72 @@ void FCDProPlusInput::applySettings(const FCDProPlusSettings& settings, bool for
         qDebug() << "FCDProPlusInput::applySettings: set IQ order to %s" << (settings.m_iqOrder ? "IQ" : "QI");
     }
 
-	if ((m_settings.m_lnaGain != settings.m_lnaGain) || force)
+	if (settingsKeys.contains("lnaGain") || force)
 	{
-        reverseAPIKeys.append("lnaGain");
-
 		if (m_dev != 0) {
 			set_lna_gain(settings.m_lnaGain);
 		}
 	}
 
-	if ((m_settings.m_biasT != settings.m_biasT) || force)
+	if (settingsKeys.contains("biasT") || force)
 	{
-        reverseAPIKeys.append("biasT");
-
 		if (m_dev != 0) {
 			set_bias_t(settings.m_biasT);
 		}
 	}
 
-	if ((m_settings.m_mixGain != settings.m_mixGain) || force)
+	if (settingsKeys.contains("mixGain") || force)
 	{
-        reverseAPIKeys.append("mixGain");
-
 		if (m_dev != 0) {
 			set_mixer_gain(settings.m_mixGain);
 		}
 	}
 
-	if ((m_settings.m_ifGain != settings.m_ifGain) || force)
+	if (settingsKeys.contains("ifGain") || force)
 	{
-        reverseAPIKeys.append("ifGain");
-
 		if (m_dev != 0) {
 			set_if_gain(settings.m_ifGain);
 		}
 	}
 
-	if ((m_settings.m_ifFilterIndex != settings.m_ifFilterIndex) || force)
+	if (settingsKeys.contains("ifFilterIndex") || force)
 	{
-        reverseAPIKeys.append("ifFilterIndex");
-
 		if (m_dev != 0) {
 			set_if_filter(settings.m_ifFilterIndex);
 		}
 	}
 
-	if ((m_settings.m_rfFilterIndex != settings.m_rfFilterIndex) || force)
+	if (settingsKeys.contains("rfFilterIndex") || force)
 	{
-        reverseAPIKeys.append("rfFilterIndex");
-
 		if (m_dev != 0) {
 			set_rf_filter(settings.m_rfFilterIndex);
 		}
 	}
 
-	if ((m_settings.m_dcBlock != settings.m_dcBlock) || force)
+	if (settingsKeys.contains("dcBlock") || force)
 	{
-        reverseAPIKeys.append("dcBlock");
 		m_deviceAPI->configureCorrections(settings.m_dcBlock, settings.m_iqImbalance);
 	}
 
-	if ((m_settings.m_iqImbalance != settings.m_iqImbalance) || force)
+	if (settingsKeys.contains("iqImbalance") || force)
 	{
-        reverseAPIKeys.append("iqImbalance");
 		m_deviceAPI->configureCorrections(settings.m_dcBlock, settings.m_iqImbalance);
 	}
 
-    if (settings.m_useReverseAPI)
+    if (settingsKeys.contains("useReverseAPI"))
     {
-        bool fullUpdate = ((m_settings.m_useReverseAPI != settings.m_useReverseAPI) && settings.m_useReverseAPI) ||
-                (m_settings.m_reverseAPIAddress != settings.m_reverseAPIAddress) ||
-                (m_settings.m_reverseAPIPort != settings.m_reverseAPIPort) ||
-                (m_settings.m_reverseAPIDeviceIndex != settings.m_reverseAPIDeviceIndex);
-        webapiReverseSendSettings(reverseAPIKeys, settings, fullUpdate || force);
+        bool fullUpdate = (settingsKeys.contains("useReverseAPI") && settings.m_useReverseAPI) ||
+            settingsKeys.contains("reverseAPIAddress") ||
+            settingsKeys.contains("reverseAPIPort") ||
+            settingsKeys.contains("reverseAPIDeviceIndex");
+        webapiReverseSendSettings(settingsKeys, settings, fullUpdate || force);
     }
 
-    m_settings = settings;
+    if (force) {
+        m_settings = settings;
+    } else {
+        m_settings.applySettings(settingsKeys, settings);
+    }
 
 	if (forwardChange)
     {
@@ -504,30 +475,26 @@ void FCDProPlusInput::set_mixer_gain(bool on)
 
 void FCDProPlusInput::set_if_gain(int gain)
 {
-	if (gain < 0)
-	{
+	if (gain < 0) {
 		return;
 	}
 
 	quint8 cmd_value = gain;
 
-	if (fcdAppSetParam(m_dev, FCDPROPLUS_HID_CMD_SET_IF_GAIN, &cmd_value, 1) != FCD_MODE_APP)
-	{
+	if (fcdAppSetParam(m_dev, FCDPROPLUS_HID_CMD_SET_IF_GAIN, &cmd_value, 1) != FCD_MODE_APP) {
 		qWarning() << "FCDProPlusInput::set_if_gain: failed to set at " << cmd_value;
 	}
 }
 
 void FCDProPlusInput::set_if_filter(int filterIndex)
 {
-	if ((filterIndex < 0) || (filterIndex >= FCDProPlusConstants::fcdproplus_if_filter_nb_values()))
-	{
+	if ((filterIndex < 0) || (filterIndex >= FCDProPlusConstants::fcdproplus_if_filter_nb_values())) {
 		return;
 	}
 
 	quint8 cmd_value = FCDProPlusConstants::if_filters[filterIndex].value;
 
-	if (fcdAppSetParam(m_dev, FCDPROPLUS_HID_CMD_SET_IF_FILTER, &cmd_value, 1) != FCD_MODE_APP)
-	{
+	if (fcdAppSetParam(m_dev, FCDPROPLUS_HID_CMD_SET_IF_FILTER, &cmd_value, 1) != FCD_MODE_APP) {
 		qWarning() << "FCDProPlusInput::set_if_filter: failed to set at " << cmd_value;
 	}
 }
@@ -535,15 +502,13 @@ void FCDProPlusInput::set_if_filter(int filterIndex)
 
 void FCDProPlusInput::set_rf_filter(int filterIndex)
 {
-	if ((filterIndex < 0) || (filterIndex >= FCDProPlusConstants::fcdproplus_rf_filter_nb_values()))
-	{
+	if ((filterIndex < 0) || (filterIndex >= FCDProPlusConstants::fcdproplus_rf_filter_nb_values())) {
 		return;
 	}
 
 	quint8 cmd_value = FCDProPlusConstants::rf_filters[filterIndex].value;
 
-	if (fcdAppSetParam(m_dev, FCDPROPLUS_HID_CMD_SET_RF_FILTER, &cmd_value, 1) != FCD_MODE_APP)
-	{
+	if (fcdAppSetParam(m_dev, FCDPROPLUS_HID_CMD_SET_RF_FILTER, &cmd_value, 1) != FCD_MODE_APP) {
 		qWarning() << "FCDProPlusInput::set_rf_filter: failed to set at " << cmd_value;
 	}
 }
@@ -597,12 +562,12 @@ int FCDProPlusInput::webapiSettingsPutPatch(
     FCDProPlusSettings settings = m_settings;
     webapiUpdateDeviceSettings(settings, deviceSettingsKeys, response);
 
-    MsgConfigureFCDProPlus *msg = MsgConfigureFCDProPlus::create(settings, force);
+    MsgConfigureFCDProPlus *msg = MsgConfigureFCDProPlus::create(settings, deviceSettingsKeys, force);
     m_inputMessageQueue.push(msg);
 
     if (m_guiMessageQueue) // forward to GUI if any
     {
-        MsgConfigureFCDProPlus *msgToGUI = MsgConfigureFCDProPlus::create(settings, force);
+        MsgConfigureFCDProPlus *msgToGUI = MsgConfigureFCDProPlus::create(settings, deviceSettingsKeys, force);
         m_guiMessageQueue->push(msgToGUI);
     }
 
@@ -708,7 +673,7 @@ void FCDProPlusInput::webapiFormatDeviceSettings(SWGSDRangel::SWGDeviceSettings&
     response.getFcdProPlusSettings()->setReverseApiDeviceIndex(settings.m_reverseAPIDeviceIndex);
 }
 
-void FCDProPlusInput::webapiReverseSendSettings(QList<QString>& deviceSettingsKeys, const FCDProPlusSettings& settings, bool force)
+void FCDProPlusInput::webapiReverseSendSettings(const QList<QString>& deviceSettingsKeys, const FCDProPlusSettings& settings, bool force)
 {
     SWGSDRangel::SWGDeviceSettings *swgDeviceSettings = new SWGSDRangel::SWGDeviceSettings();
     swgDeviceSettings->setDirection(0); // single Rx
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.h b/plugins/samplesource/fcdproplus/fcdproplusinput.h
index fa7c742cf..034069435 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.h
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.h
@@ -49,20 +49,23 @@ public:
 
 	public:
 		const FCDProPlusSettings& getSettings() const { return m_settings; }
+        const QList<QString>& getSettingsKeys() const { return m_settingsKeys; }
 		bool getForce() const { return m_force; }
 
-		static MsgConfigureFCDProPlus* create(const FCDProPlusSettings& settings, bool force)
+		static MsgConfigureFCDProPlus* create(const FCDProPlusSettings& settings, const QList<QString>& settingsKeys, bool force)
 		{
-			return new MsgConfigureFCDProPlus(settings, force);
+			return new MsgConfigureFCDProPlus(settings, settingsKeys, force);
 		}
 
 	private:
 		FCDProPlusSettings m_settings;
+        QList<QString> m_settingsKeys;
 		bool m_force;
 
-		MsgConfigureFCDProPlus(const FCDProPlusSettings& settings, bool force) :
+		MsgConfigureFCDProPlus(const FCDProPlusSettings& settings, const QList<QString>& settingsKeys, bool force) :
 			Message(),
 			m_settings(settings),
+            m_settingsKeys(settingsKeys),
 			m_force(force)
 		{ }
 	};
@@ -159,8 +162,8 @@ private:
     void closeDevice();
     bool openFCDAudio(const char *filename);
     void closeFCDAudio();
-	void applySettings(const FCDProPlusSettings& settings, bool force);
-    void webapiReverseSendSettings(QList<QString>& deviceSettingsKeys, const FCDProPlusSettings& settings, bool force);
+	void applySettings(const FCDProPlusSettings& settings, const QList<QString>& settingsKeys, bool force);
+    void webapiReverseSendSettings(const QList<QString>& deviceSettingsKeys, const FCDProPlusSettings& settings, bool force);
     void webapiReverseSendStartStop(bool start);
 
 private slots:
diff --git a/plugins/samplesource/fcdproplus/fcdproplussettings.cpp b/plugins/samplesource/fcdproplus/fcdproplussettings.cpp
index aaa302934..6515bb6a9 100644
--- a/plugins/samplesource/fcdproplus/fcdproplussettings.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplussettings.cpp
@@ -126,3 +126,137 @@ bool FCDProPlusSettings::deserialize(const QByteArray& data)
 	}
 }
 
+void FCDProPlusSettings::applySettings(const QStringList& settingsKeys, const FCDProPlusSettings& settings)
+{
+    if (settingsKeys.contains("centerFrequency")) {
+        m_centerFrequency = settings.m_centerFrequency;
+    }
+    if (settingsKeys.contains("rangeLow")) {
+        m_rangeLow = settings.m_rangeLow;
+    }
+    if (settingsKeys.contains("lnaGain")) {
+        m_lnaGain = settings.m_lnaGain;
+    }
+    if (settingsKeys.contains("biasT")) {
+        m_biasT = settings.m_biasT;
+    }
+    if (settingsKeys.contains("ifGain")) {
+        m_ifGain = settings.m_ifGain;
+    }
+    if (settingsKeys.contains("mixGain")) {
+        m_mixGain = settings.m_mixGain;
+    }
+    if (settingsKeys.contains("rfFilterIndex")) {
+        m_rfFilterIndex = settings.m_rfFilterIndex;
+    }
+    if (settingsKeys.contains("ifFilterIndex")) {
+        m_ifFilterIndex = settings.m_ifFilterIndex;
+    }
+    if (settingsKeys.contains("LOppmTenths")) {
+        m_LOppmTenths = settings.m_LOppmTenths;
+    }
+    if (settingsKeys.contains("log2Decim")) {
+        m_log2Decim = settings.m_log2Decim;
+    }
+    if (settingsKeys.contains("fcPos")) {
+        m_fcPos = settings.m_fcPos;
+    }
+    if (settingsKeys.contains("dcBlock")) {
+        m_dcBlock = settings.m_dcBlock;
+    }
+    if (settingsKeys.contains("iqImbalance")) {
+        m_iqImbalance = settings.m_iqImbalance;
+    }
+    if (settingsKeys.contains("centerFrequency")) {
+        m_centerFrequency = settings.m_centerFrequency;
+    }
+    if (settingsKeys.contains("transverterMode")) {
+        m_transverterMode = settings.m_transverterMode;
+    }
+    if (settingsKeys.contains("transverterDeltaFrequency")) {
+        m_transverterDeltaFrequency = settings.m_transverterDeltaFrequency;
+    }
+    if (settingsKeys.contains("iqOrder")) {
+        m_iqOrder = settings.m_iqOrder;
+    }
+    if (settingsKeys.contains("useReverseAPI")) {
+        m_useReverseAPI = settings.m_useReverseAPI;
+    }
+    if (settingsKeys.contains("reverseAPIAddress")) {
+        m_reverseAPIAddress = settings.m_reverseAPIAddress;
+    }
+    if (settingsKeys.contains("reverseAPIPort")) {
+        m_reverseAPIPort = settings.m_reverseAPIPort;
+    }
+    if (settingsKeys.contains("reverseAPIDeviceIndex")) {
+        m_reverseAPIDeviceIndex = settings.m_reverseAPIDeviceIndex;
+    }
+}
+
+QString FCDProPlusSettings::getDebugString(const QStringList& settingsKeys, bool force) const
+{
+    std::ostringstream ostr;
+
+    if (settingsKeys.contains("centerFrequency") || force) {
+        ostr << " m_centerFrequency: " << m_centerFrequency;
+    }
+    if (settingsKeys.contains("rangeLow") || force) {
+        ostr << " m_rangeLow: " << m_rangeLow;
+    }
+    if (settingsKeys.contains("lnaGain") || force) {
+        ostr << " m_lnaGain: " << m_lnaGain;
+    }
+    if (settingsKeys.contains("biasT") || force) {
+        ostr << " m_biasT: " << m_biasT;
+    }
+    if (settingsKeys.contains("ifGain") || force) {
+        ostr << " m_ifGain: " << m_ifGain;
+    }
+    if (settingsKeys.contains("mixGain") || force) {
+        ostr << " m_mixGain: " << m_mixGain;
+    }
+    if (settingsKeys.contains("rfFilterIndex") || force) {
+        ostr << " m_rfFilterIndex: " << m_rfFilterIndex;
+    }
+    if (settingsKeys.contains("ifFilterIndex") || force) {
+        ostr << " m_ifFilterIndex: " << m_ifFilterIndex;
+    }
+    if (settingsKeys.contains("LOppmTenths") || force) {
+        ostr << " m_LOppmTenths: " << m_LOppmTenths;
+    }
+    if (settingsKeys.contains("log2Decim") || force) {
+        ostr << " m_log2Decim: " << m_log2Decim;
+    }
+    if (settingsKeys.contains("fcPos") || force) {
+        ostr << " m_fcPos: " << m_fcPos;
+    }
+    if (settingsKeys.contains("dcBlock") || force) {
+        ostr << " m_dcBlock: " << m_dcBlock;
+    }
+    if (settingsKeys.contains("iqImbalance") || force) {
+        ostr << " m_iqImbalance: " << m_iqImbalance;
+    }
+    if (settingsKeys.contains("transverterMode") || force) {
+        ostr << " m_transverterMode: " << m_transverterMode;
+    }
+    if (settingsKeys.contains("transverterDeltaFrequency") || force) {
+        ostr << " m_transverterDeltaFrequency: " << m_transverterDeltaFrequency;
+    }
+    if (settingsKeys.contains("iqOrder") || force) {
+        ostr << " m_iqOrder: " << m_iqOrder;
+    }
+    if (settingsKeys.contains("useReverseAPI") || force) {
+        ostr << " m_useReverseAPI: " << m_useReverseAPI;
+    }
+    if (settingsKeys.contains("reverseAPIAddress") || force) {
+        ostr << " m_reverseAPIAddress: " << m_reverseAPIAddress.toStdString();
+    }
+    if (settingsKeys.contains("reverseAPIPort") || force) {
+        ostr << " m_reverseAPIPort: " << m_reverseAPIPort;
+    }
+    if (settingsKeys.contains("reverseAPIDeviceIndex") || force) {
+        ostr << " m_reverseAPIDeviceIndex: " << m_reverseAPIDeviceIndex;
+    }
+
+    return QString(ostr.str().c_str());
+}
diff --git a/plugins/samplesource/fcdproplus/fcdproplussettings.h b/plugins/samplesource/fcdproplus/fcdproplussettings.h
index ed5bf7401..9886bb0b9 100644
--- a/plugins/samplesource/fcdproplus/fcdproplussettings.h
+++ b/plugins/samplesource/fcdproplus/fcdproplussettings.h
@@ -52,6 +52,8 @@ struct FCDProPlusSettings {
 	void resetToDefaults();
 	QByteArray serialize() const;
 	bool deserialize(const QByteArray& data);
+    void applySettings(const QStringList& settingsKeys, const FCDProPlusSettings& settings);
+    QString getDebugString(const QStringList& settingsKeys, bool force=false) const;
 };
 
 #endif /* _FCDPROPLUS_FCDPROPLUSSETTINGS_H_ */