diff --git a/plugins/samplesource/airspy/airspyinput.cpp b/plugins/samplesource/airspy/airspyinput.cpp
index 1e7c82610..1ccb89964 100644
--- a/plugins/samplesource/airspy/airspyinput.cpp
+++ b/plugins/samplesource/airspy/airspyinput.cpp
@@ -147,6 +147,11 @@ bool AirspyInput::openDevice()
     return true;
 }
 
+void AirspyInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool AirspyInput::start()
 {
 	QMutexLocker mutexLocker(&m_mutex);
diff --git a/plugins/samplesource/airspy/airspyinput.h b/plugins/samplesource/airspy/airspyinput.h
index 828ae1120..505420d3a 100644
--- a/plugins/samplesource/airspy/airspyinput.h
+++ b/plugins/samplesource/airspy/airspyinput.h
@@ -94,6 +94,7 @@ public:
 	virtual ~AirspyInput();
 	virtual void destroy();
 
+	virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/bladerfinput/bladerfinput.cpp b/plugins/samplesource/bladerfinput/bladerfinput.cpp
index 1169e2663..0e1cb3d3d 100644
--- a/plugins/samplesource/bladerfinput/bladerfinput.cpp
+++ b/plugins/samplesource/bladerfinput/bladerfinput.cpp
@@ -131,6 +131,11 @@ bool BladerfInput::openDevice()
     return true;
 }
 
+void BladerfInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool BladerfInput::start()
 {
 //	QMutexLocker mutexLocker(&m_mutex);
diff --git a/plugins/samplesource/bladerfinput/bladerfinput.h b/plugins/samplesource/bladerfinput/bladerfinput.h
index 24ee4286c..f5e42fc66 100644
--- a/plugins/samplesource/bladerfinput/bladerfinput.h
+++ b/plugins/samplesource/bladerfinput/bladerfinput.h
@@ -97,6 +97,7 @@ public:
 	virtual ~BladerfInput();
 	virtual void destroy();
 
+    virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/fcdpro/fcdproinput.cpp b/plugins/samplesource/fcdpro/fcdproinput.cpp
index d99beae57..4178782e1 100644
--- a/plugins/samplesource/fcdpro/fcdproinput.cpp
+++ b/plugins/samplesource/fcdpro/fcdproinput.cpp
@@ -91,6 +91,11 @@ bool FCDProInput::openDevice()
     return true;
 }
 
+void FCDProInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool FCDProInput::start()
 {
 	qDebug() << "FCDProInput::start";
diff --git a/plugins/samplesource/fcdpro/fcdproinput.h b/plugins/samplesource/fcdpro/fcdproinput.h
index b623e41c7..5571f691c 100644
--- a/plugins/samplesource/fcdpro/fcdproinput.h
+++ b/plugins/samplesource/fcdpro/fcdproinput.h
@@ -101,6 +101,7 @@ public:
 	virtual ~FCDProInput();
 	virtual void destroy();
 
+    virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
index d2b10b074..7673ba2b1 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
@@ -84,6 +84,11 @@ bool FCDProPlusInput::openDevice()
     return true;
 }
 
+void FCDProPlusInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool FCDProPlusInput::start()
 {
 
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.h b/plugins/samplesource/fcdproplus/fcdproplusinput.h
index 30b876afa..47974d9eb 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.h
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.h
@@ -100,6 +100,7 @@ public:
 	virtual ~FCDProPlusInput();
 	virtual void destroy();
 
+    virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/filesource/filesourceinput.cpp b/plugins/samplesource/filesource/filesourceinput.cpp
index df5b0d0fd..68f8f8b61 100644
--- a/plugins/samplesource/filesource/filesourceinput.cpp
+++ b/plugins/samplesource/filesource/filesourceinput.cpp
@@ -121,6 +121,12 @@ void FileSourceInput::seekFileStream(int seekPercentage)
 	}
 }
 
+void FileSourceInput::init()
+{
+    DSPSignalNotification *notif = new DSPSignalNotification(m_settings.m_sampleRate, m_settings.m_centerFrequency);
+    m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
+}
+
 bool FileSourceInput::start()
 {
 	QMutexLocker mutexLocker(&m_mutex);
diff --git a/plugins/samplesource/filesource/filesourceinput.h b/plugins/samplesource/filesource/filesourceinput.h
index ea5ed431c..5eae0c85f 100644
--- a/plugins/samplesource/filesource/filesourceinput.h
+++ b/plugins/samplesource/filesource/filesourceinput.h
@@ -226,6 +226,7 @@ public:
 	virtual ~FileSourceInput();
 	virtual void destroy();
 
+    virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/hackrfinput/hackrfinput.cpp b/plugins/samplesource/hackrfinput/hackrfinput.cpp
index 304f99a22..f28b9459f 100644
--- a/plugins/samplesource/hackrfinput/hackrfinput.cpp
+++ b/plugins/samplesource/hackrfinput/hackrfinput.cpp
@@ -119,6 +119,11 @@ bool HackRFInput::openDevice()
     return true;
 }
 
+void HackRFInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool HackRFInput::start()
 {
 //	QMutexLocker mutexLocker(&m_mutex);
diff --git a/plugins/samplesource/hackrfinput/hackrfinput.h b/plugins/samplesource/hackrfinput/hackrfinput.h
index 3e603fc9a..95023d4a8 100644
--- a/plugins/samplesource/hackrfinput/hackrfinput.h
+++ b/plugins/samplesource/hackrfinput/hackrfinput.h
@@ -114,6 +114,7 @@ public:
 	virtual ~HackRFInput();
 	virtual void destroy();
 
+    virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/limesdrinput/limesdrinput.cpp b/plugins/samplesource/limesdrinput/limesdrinput.cpp
index f34fe1562..bb70fb895 100644
--- a/plugins/samplesource/limesdrinput/limesdrinput.cpp
+++ b/plugins/samplesource/limesdrinput/limesdrinput.cpp
@@ -364,6 +364,11 @@ void LimeSDRInput::releaseChannel()
     m_channelAcquired = false;
 }
 
+void LimeSDRInput::init()
+{
+    applySettings(m_settings, true, false);
+}
+
 bool LimeSDRInput::start()
 {
     if (!m_deviceShared.m_deviceParams->getDevice()) {
diff --git a/plugins/samplesource/limesdrinput/limesdrinput.h b/plugins/samplesource/limesdrinput/limesdrinput.h
index 42314ef92..8de2d601a 100644
--- a/plugins/samplesource/limesdrinput/limesdrinput.h
+++ b/plugins/samplesource/limesdrinput/limesdrinput.h
@@ -208,6 +208,7 @@ public:
     virtual ~LimeSDRInput();
     virtual void destroy();
 
+    virtual void init();
     virtual bool start();
     virtual void stop();
 
diff --git a/plugins/samplesource/plutosdrinput/plutosdrinput.cpp b/plugins/samplesource/plutosdrinput/plutosdrinput.cpp
index 518296c83..c6e3aea66 100644
--- a/plugins/samplesource/plutosdrinput/plutosdrinput.cpp
+++ b/plugins/samplesource/plutosdrinput/plutosdrinput.cpp
@@ -68,6 +68,11 @@ void PlutoSDRInput::destroy()
     delete this;
 }
 
+void PlutoSDRInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool PlutoSDRInput::start()
 {
     if (!m_deviceShared.m_deviceParams->getBox()) {
diff --git a/plugins/samplesource/plutosdrinput/plutosdrinput.h b/plugins/samplesource/plutosdrinput/plutosdrinput.h
index 6504418d7..dc57ca898 100644
--- a/plugins/samplesource/plutosdrinput/plutosdrinput.h
+++ b/plugins/samplesource/plutosdrinput/plutosdrinput.h
@@ -96,6 +96,7 @@ public:
     ~PlutoSDRInput();
     virtual void destroy();
 
+    virtual void init();
     virtual bool start();
     virtual void stop();
 
diff --git a/plugins/samplesource/rtlsdr/rtlsdrinput.cpp b/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
index 0accf0e8d..68f9877e2 100644
--- a/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
+++ b/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
@@ -173,6 +173,11 @@ bool RTLSDRInput::openDevice()
     return true;
 }
 
+void RTLSDRInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool RTLSDRInput::start()
 {
 	QMutexLocker mutexLocker(&m_mutex);
diff --git a/plugins/samplesource/rtlsdr/rtlsdrinput.h b/plugins/samplesource/rtlsdr/rtlsdrinput.h
index 54a82d67f..429b84f8e 100644
--- a/plugins/samplesource/rtlsdr/rtlsdrinput.h
+++ b/plugins/samplesource/rtlsdr/rtlsdrinput.h
@@ -95,6 +95,7 @@ public:
 	virtual ~RTLSDRInput();
 	virtual void destroy();
 
+	virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.cpp b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.cpp
index 5bbb06b5d..6f7fcdf42 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.cpp
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.cpp
@@ -77,6 +77,12 @@ void SDRdaemonSourceInput::destroy()
     delete this;
 }
 
+void SDRdaemonSourceInput::init()
+{
+    DSPSignalNotification *notif = new DSPSignalNotification(m_settings.m_sampleRate/(1<<m_settings.m_log2Decim), m_settings.m_centerFrequency);
+    m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
+}
+
 bool SDRdaemonSourceInput::start()
 {
 	qDebug() << "SDRdaemonInput::start";
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.h b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.h
index 5fdcb87ff..0992cb84a 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.h
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceinput.h
@@ -326,6 +326,7 @@ public:
 	virtual ~SDRdaemonSourceInput();
 	virtual void destroy();
 
+    virtual void init();
 	virtual bool start();
 	virtual void stop();
 
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcesettings.cpp b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcesettings.cpp
index df6172f5d..81da4ca8a 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcesettings.cpp
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcesettings.cpp
@@ -26,7 +26,7 @@ void SDRdaemonSourceSettings::resetToDefaults()
 {
     m_centerFrequency = 435000*1000;
     m_sampleRate = 256000;
-    m_log2Decim = 4;
+    m_log2Decim = 1;
     m_txDelay = 0.5;
     m_nbFECBlocks = 0;
     m_address = "127.0.0.1";
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp
index 66bcf3be7..95294e6bd 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp
@@ -34,6 +34,7 @@ SDRdaemonSourceUDPHandler::SDRdaemonSourceUDPHandler(SampleSinkFifo *sampleFifo,
 	m_remoteAddress(QHostAddress::LocalHost),
 	m_dataPort(9090),
 	m_dataConnected(false),
+	m_startInit(true),
 	m_udpBuf(0),
 	m_udpReadBytes(0),
 	m_sampleFifo(sampleFifo),
@@ -92,8 +93,8 @@ void SDRdaemonSourceUDPHandler::start()
 		}
 	}
 
-	// Need to notify the DSP engine to actually start
-	DSPSignalNotification *notif = new DSPSignalNotification(m_samplerate, m_centerFrequency * 1000); // Frequency in Hz for the DSP engine
+	// Need to notify the DSP engine to actually start FIXME: may cause transient confusion because at this point sample rate and frequency are unknown
+	DSPSignalNotification *notif = new DSPSignalNotification(128000, 435000 * 1000); // Frequency in Hz for the DSP engine
 	m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
     m_elapsedTimer.start();
 }
@@ -113,6 +114,8 @@ void SDRdaemonSourceUDPHandler::stop()
 		delete m_dataSocket;
 		m_dataSocket = 0;
 	}
+
+	m_startInit = true;
 }
 
 void SDRdaemonSourceUDPHandler::configureUDPLink(const QString& address, quint16 port)
@@ -170,17 +173,23 @@ void SDRdaemonSourceUDPHandler::processData()
         change = true;
     }
 
-    if (change)
+    if (change || m_startInit)
     {
-        DSPSignalNotification *notif = new DSPSignalNotification(m_samplerate, m_centerFrequency * 1000); // Frequency in Hz for the DSP engine
-        m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
-        SDRdaemonSourceInput::MsgReportSDRdaemonSourceStreamData *report = SDRdaemonSourceInput::MsgReportSDRdaemonSourceStreamData::create(
-            m_samplerate,
-            m_centerFrequency * 1000, // Frequency in Hz for the GUI
-            m_tv_sec,
-            m_tv_usec);
+        qDebug("SDRdaemonSourceUDPHandler::processData: m_samplerate: %u m_centerFrequency: %u kHz", m_samplerate, m_centerFrequency);
 
-        m_outputMessageQueueToGUI->push(report);
+        if (m_samplerate != 0)
+        {
+            DSPSignalNotification *notif = new DSPSignalNotification(m_samplerate, m_centerFrequency * 1000); // Frequency in Hz for the DSP engine
+            m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
+            SDRdaemonSourceInput::MsgReportSDRdaemonSourceStreamData *report = SDRdaemonSourceInput::MsgReportSDRdaemonSourceStreamData::create(
+                m_samplerate,
+                m_centerFrequency * 1000, // Frequency in Hz for the GUI
+                m_tv_sec,
+                m_tv_usec);
+
+            m_outputMessageQueueToGUI->push(report);
+            m_startInit = false;
+        }
     }
 }
 
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h
index 2ef6bd05e..428402d2a 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h
@@ -56,6 +56,7 @@ private:
 	QHostAddress m_remoteAddress;
 	quint16 m_dataPort;
 	bool m_dataConnected;
+	bool m_startInit;
 	char *m_udpBuf;
 	qint64 m_udpReadBytes;
 	SampleSinkFifo *m_sampleFifo;
diff --git a/plugins/samplesource/sdrplay/sdrplayinput.cpp b/plugins/samplesource/sdrplay/sdrplayinput.cpp
index 0f01613c4..be92a2cf5 100644
--- a/plugins/samplesource/sdrplay/sdrplayinput.cpp
+++ b/plugins/samplesource/sdrplay/sdrplayinput.cpp
@@ -198,6 +198,11 @@ void SDRPlayInput::closeDevice()
     m_deviceDescription.clear();
 }
 
+void SDRPlayInput::init()
+{
+    applySettings(m_settings, true, true);
+}
+
 void SDRPlayInput::stop()
 {
 //    QMutexLocker mutexLocker(&m_mutex);
diff --git a/plugins/samplesource/sdrplay/sdrplayinput.h b/plugins/samplesource/sdrplay/sdrplayinput.h
index f1b90e98b..996bba94a 100644
--- a/plugins/samplesource/sdrplay/sdrplayinput.h
+++ b/plugins/samplesource/sdrplay/sdrplayinput.h
@@ -132,6 +132,7 @@ public:
     virtual ~SDRPlayInput();
     virtual void destroy();
 
+    virtual void init();
     virtual bool start();
     virtual void stop();
 
diff --git a/sdrbase/dsp/devicesamplesource.h b/sdrbase/dsp/devicesamplesource.h
index 88971024b..6ba02ca33 100644
--- a/sdrbase/dsp/devicesamplesource.h
+++ b/sdrbase/dsp/devicesamplesource.h
@@ -38,6 +38,7 @@ public:
 	virtual ~DeviceSampleSource();
 	virtual void destroy() = 0;
 
+	virtual void init() = 0;  //!< initializations to be done when all collaborating objects are created and possibly connected
 	virtual bool start() = 0;
 	virtual void stop() = 0;
 
diff --git a/sdrbase/dsp/dspdevicesinkengine.cpp b/sdrbase/dsp/dspdevicesinkengine.cpp
index a6384289a..94acf810e 100644
--- a/sdrbase/dsp/dspdevicesinkengine.cpp
+++ b/sdrbase/dsp/dspdevicesinkengine.cpp
@@ -365,8 +365,6 @@ DSPDeviceSinkEngine::State DSPDeviceSinkEngine::gotoIdle()
 
 DSPDeviceSinkEngine::State DSPDeviceSinkEngine::gotoInit()
 {
-	qDebug() << "DSPDeviceSinkEngine::gotoInit";
-
 	switch(m_state) {
 		case StNotStarted:
 			return StNotStarted;
@@ -393,7 +391,8 @@ DSPDeviceSinkEngine::State DSPDeviceSinkEngine::gotoInit()
 	m_centerFrequency = m_deviceSampleSink->getCenterFrequency();
 	m_sampleRate = m_deviceSampleSink->getSampleRate();
 
-	qDebug() << "DSPDeviceSinkEngine::gotoInit: " << m_deviceDescription.toStdString().c_str() << ": "
+	qDebug() << "DSPDeviceSinkEngine::gotoInit: "
+	        << " m_deviceDescription: " << m_deviceDescription.toStdString().c_str()
 			<< " sampleRate: " << m_sampleRate
 			<< " centerFrequency: " << m_centerFrequency;
 
diff --git a/sdrbase/dsp/dspdevicesourceengine.cpp b/sdrbase/dsp/dspdevicesourceengine.cpp
index 14c9d2f75..c8c9aeff5 100644
--- a/sdrbase/dsp/dspdevicesourceengine.cpp
+++ b/sdrbase/dsp/dspdevicesourceengine.cpp
@@ -365,8 +365,6 @@ DSPDeviceSourceEngine::State DSPDeviceSourceEngine::gotoIdle()
 
 DSPDeviceSourceEngine::State DSPDeviceSourceEngine::gotoInit()
 {
-	qDebug() << "DSPDeviceSourceEngine::gotoInit";
-
 	switch(m_state) {
 		case StNotStarted:
 			return StNotStarted;
@@ -398,7 +396,8 @@ DSPDeviceSourceEngine::State DSPDeviceSourceEngine::gotoInit()
 	m_centerFrequency = m_deviceSampleSource->getCenterFrequency();
 	m_sampleRate = m_deviceSampleSource->getSampleRate();
 
-	qDebug() << "DSPDeviceSourceEngine::gotoInit: " << m_deviceDescription.toStdString().c_str() << ": "
+	qDebug() << "DSPDeviceSourceEngine::gotoInit: "
+	        << " m_deviceDescription: " << m_deviceDescription.toStdString().c_str()
 			<< " sampleRate: " << m_sampleRate
 			<< " centerFrequency: " << m_centerFrequency;
 
@@ -651,6 +650,7 @@ void DSPDeviceSourceEngine::handleInputMessages()
 			// forward changes to source GUI input queue
 
 			MessageQueue *guiMessageQueue = m_deviceSampleSource->getMessageQueueToGUI();
+			qDebug("DSPDeviceSourceEngine::handleInputMessages: DSPSignalNotification: guiMessageQueue: %p", guiMessageQueue);
 
 			if (guiMessageQueue) {
 			    DSPSignalNotification* rep = new DSPSignalNotification(*notif); // make a copy for the source GUI
diff --git a/sdrgui/mainwindow.cpp b/sdrgui/mainwindow.cpp
index ed183f8c9..b34636141 100644
--- a/sdrgui/mainwindow.cpp
+++ b/sdrgui/mainwindow.cpp
@@ -144,54 +144,14 @@ MainWindow::MainWindow(qtwebapp::LoggerWithFile *logger, const MainParser& parse
 
 	m_masterTimer.start(50);
 
-    qDebug() << "MainWindow::MainWindow: add the first device...";
-
-    addSourceDevice(); // add the first device
-
     qDebug() << "MainWindow::MainWindow: load settings...";
 
 	loadSettings();
 
-	qDebug() << "MainWindow::MainWindow: select SampleSource from settings...";
+	qDebug() << "MainWindow::MainWindow: select SampleSource from settings or default (file source) ...";
 
 	int deviceIndex = DeviceEnumerator::instance()->getRxSamplingDeviceIndex(m_settings.getSourceDeviceId(), m_settings.getSourceIndex());
-
-	if (deviceIndex >= 0)
-	{
-        // delete previous plugin GUI
-        m_deviceUIs.back()->m_deviceSourceAPI->getPluginInterface()->deleteSampleSourcePluginInstanceGUI(
-                m_deviceUIs.back()->m_deviceSourceAPI->getSampleSourcePluginInstanceGUI());
-        m_deviceUIs.back()->m_deviceSourceAPI->resetSampleSourceId();
-        m_deviceUIs.back()->m_deviceSourceAPI->getSampleSource()->setMessageQueueToGUI(0); // have source stop sending messages to the GUI
-        m_deviceUIs.back()->m_deviceSourceAPI->getPluginInterface()->deleteSampleSourcePluginInstanceInput(
-                m_deviceUIs.back()->m_deviceSourceAPI->getSampleSource());
-        m_deviceUIs.back()->m_deviceSourceAPI->clearBuddiesLists(); // clear old API buddies lists
-
-        m_deviceUIs.back()->m_samplingDeviceControl->setSelectedDeviceIndex(deviceIndex);
-
-	    PluginInterface::SamplingDevice samplingDevice = DeviceEnumerator::instance()->getRxSamplingDevice(deviceIndex);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceSequence(samplingDevice.sequence);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setNbItems(samplingDevice.deviceItemIndex);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setItemIndex(samplingDevice.deviceItemIndex);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setHardwareId(samplingDevice.hardwareId);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceId(samplingDevice.id);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceSerial(samplingDevice.serial);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceDisplayName(samplingDevice.displayedName);
-	    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourcePluginInterface(DeviceEnumerator::instance()->getRxPluginInterface(deviceIndex));
-
-	    DeviceSampleSource *source = m_deviceUIs.back()->m_deviceSourceAPI->getPluginInterface()->createSampleSourcePluginInstanceInput(
-                m_deviceUIs.back()->m_deviceSourceAPI->getSampleSourceId(), m_deviceUIs.back()->m_deviceSourceAPI);
-        m_deviceUIs.back()->m_deviceSourceAPI->setSampleSource(source);
-        QWidget *gui;
-        PluginInstanceGUI *pluginGUI = m_deviceUIs.back()->m_deviceSourceAPI->getPluginInterface()->createSampleSourcePluginInstanceGUI(
-                m_deviceUIs.back()->m_deviceSourceAPI->getSampleSourceId(),
-                &gui,
-                m_deviceUIs.back());
-        m_deviceUIs.back()->m_deviceSourceAPI->getSampleSource()->setMessageQueueToGUI(pluginGUI->getInputMessageQueue());
-        m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourcePluginInstanceGUI(pluginGUI);
-        setDeviceGUI(0, gui, m_deviceUIs.back()->m_deviceSourceAPI->getSampleSourceDisplayName());
-	}
-
+	addSourceDevice(deviceIndex);  // add the first device set with file source device as default if device in settings is not enumerated
 	m_deviceUIs.back()->m_deviceSourceAPI->setBuddyLeader(true); // the first device is always the leader
 
 	qDebug() << "MainWindow::MainWindow: load current preset settings...";
@@ -234,7 +194,7 @@ MainWindow::~MainWindow()
 	delete m_logger;
 }
 
-void MainWindow::addSourceDevice()
+void MainWindow::addSourceDevice(int deviceIndex)
 {
     DSPDeviceSourceEngine *dspDeviceSourceEngine = m_dspEngine->addDeviceSourceEngine();
     dspDeviceSourceEngine->start();
@@ -271,9 +231,12 @@ void MainWindow::addSourceDevice()
     ui->tabInputsSelect->addTab(m_deviceUIs.back()->m_samplingDeviceControl, tabNameCStr);
     ui->tabInputsSelect->setTabToolTip(deviceTabIndex, QString(uidCStr));
 
-    // Create a file source instance by default
-    int fileSourceDeviceIndex = DeviceEnumerator::instance()->getFileSourceDeviceIndex();
-    PluginInterface::SamplingDevice samplingDevice = DeviceEnumerator::instance()->getRxSamplingDevice(fileSourceDeviceIndex);
+    // Create a file source instance by default if requested device was not enumerated (index = -1)
+    if (deviceIndex < 0) {
+        deviceIndex = DeviceEnumerator::instance()->getFileSourceDeviceIndex();
+    }
+
+    PluginInterface::SamplingDevice samplingDevice = DeviceEnumerator::instance()->getRxSamplingDevice(deviceIndex);
     m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceSequence(samplingDevice.sequence);
     m_deviceUIs.back()->m_deviceSourceAPI->setNbItems(samplingDevice.deviceNbItems);
     m_deviceUIs.back()->m_deviceSourceAPI->setItemIndex(samplingDevice.deviceItemIndex);
@@ -281,9 +244,9 @@ void MainWindow::addSourceDevice()
     m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceId(samplingDevice.id);
     m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceSerial(samplingDevice.serial);
     m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourceDisplayName(samplingDevice.displayedName);
-    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourcePluginInterface(DeviceEnumerator::instance()->getRxPluginInterface(fileSourceDeviceIndex));
+    m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourcePluginInterface(DeviceEnumerator::instance()->getRxPluginInterface(deviceIndex));
 
-    m_deviceUIs.back()->m_samplingDeviceControl->setSelectedDeviceIndex(fileSourceDeviceIndex);
+    m_deviceUIs.back()->m_samplingDeviceControl->setSelectedDeviceIndex(deviceIndex);
 
     // delete previous plugin GUI
     m_deviceUIs.back()->m_deviceSourceAPI->getPluginInterface()->deleteSampleSourcePluginInstanceGUI(
@@ -300,6 +263,7 @@ void MainWindow::addSourceDevice()
             m_deviceUIs.back());
     m_deviceUIs.back()->m_deviceSourceAPI->getSampleSource()->setMessageQueueToGUI(pluginGUI->getInputMessageQueue());
     m_deviceUIs.back()->m_deviceSourceAPI->setSampleSourcePluginInstanceGUI(pluginGUI);
+    m_deviceUIs.back()->m_deviceSourceAPI->getSampleSource()->init();
     setDeviceGUI(deviceTabIndex, gui, m_deviceUIs.back()->m_deviceSourceAPI->getSampleSourceDisplayName());
 }
 
@@ -735,7 +699,7 @@ bool MainWindow::handleMessage(const Message& cmd)
         if (notif.isTx()) {
             addSinkDevice();
         } else {
-            addSourceDevice();
+            addSourceDevice(-1); // create with file source device by default
         }
 
         return true;
@@ -1130,6 +1094,7 @@ void MainWindow::on_sampleSource_changed()
         deviceUI->m_deviceSourceAPI->getSampleSource()->setMessageQueueToGUI(pluginUI->getInputMessageQueue());
         deviceUI->m_deviceSourceAPI->setSampleSourcePluginInstanceGUI(pluginUI);
         setDeviceGUI(currentSourceTabIndex, gui, deviceUI->m_deviceSourceAPI->getSampleSourceDisplayName());
+        deviceUI->m_deviceSourceAPI->getSampleSource()->init();
 
         deviceUI->m_deviceSourceAPI->loadSourceSettings(m_settings.getWorkingPreset()); // load new API settings
 
@@ -1257,7 +1222,7 @@ void MainWindow::on_action_About_triggered()
 
 void MainWindow::on_action_addSourceDevice_triggered()
 {
-    addSourceDevice();
+    addSourceDevice(-1); // create with file source device by default
 }
 
 void MainWindow::on_action_addSinkDevice_triggered()
diff --git a/sdrgui/mainwindow.h b/sdrgui/mainwindow.h
index fadb80a4d..698e33649 100644
--- a/sdrgui/mainwindow.h
+++ b/sdrgui/mainwindow.h
@@ -319,7 +319,7 @@ private:
 	QTreeWidgetItem* addPresetToTree(const Preset* preset);
 	void applySettings();
 
-	void addSourceDevice();
+	void addSourceDevice(int deviceIndex);
 	void addSinkDevice();
     void removeLastDevice();
     void deleteChannel(int deviceSetIndex, int channelIndex);