diff --git a/devices/limesdr/devicelimesdr.cpp b/devices/limesdr/devicelimesdr.cpp
index 659e7fad1..c091dbc7b 100644
--- a/devices/limesdr/devicelimesdr.cpp
+++ b/devices/limesdr/devicelimesdr.cpp
@@ -180,10 +180,10 @@ bool DeviceLimeSDR::SetRBBPGA_dB(lms_device_t *device, std::size_t chan, float v
     int rcc_ctl_pga_rbb = (430.0*pow(0.65, (g_pga_rbb/10.0))-110.35)/20.4516 + 16;
 
     int c_ctl_pga_rbb = 0;
-    if (0 <= g_pga_rbb && g_pga_rbb < 8) c_ctl_pga_rbb = 3;
-    if (8 <= g_pga_rbb && g_pga_rbb < 13) c_ctl_pga_rbb = 2;
-    if (13 <= g_pga_rbb && g_pga_rbb < 21) c_ctl_pga_rbb = 1;
-    if (21 <= g_pga_rbb) c_ctl_pga_rbb = 0;
+    if (g_pga_rbb < 8) { c_ctl_pga_rbb = 3; }
+    if (8 <= g_pga_rbb && g_pga_rbb < 13) { c_ctl_pga_rbb = 2; }
+    if (13 <= g_pga_rbb && g_pga_rbb < 21) { c_ctl_pga_rbb = 1; }
+    if (21 <= g_pga_rbb) { c_ctl_pga_rbb = 0; }
 
     if (LMS_WriteParam(device, LMS7param(RCC_CTL_PGA_RBB), rcc_ctl_pga_rbb) < 0)
     {
diff --git a/devices/limesdr/devicelimesdrparam.h b/devices/limesdr/devicelimesdrparam.h
index 34dfd8925..1bc6cdd78 100644
--- a/devices/limesdr/devicelimesdrparam.h
+++ b/devices/limesdr/devicelimesdrparam.h
@@ -53,6 +53,29 @@ struct DeviceLimeSDRParams
         m_rxFrequency(1e6),
         m_txFrequency(1e6)
     {
+        m_lpfRangeRx.max = 0.0f;
+        m_lpfRangeRx.min = 0.0f;
+        m_lpfRangeRx.step = 0.0f;
+
+        m_lpfRangeTx.max = 0.0f;
+        m_lpfRangeTx.min = 0.0f;
+        m_lpfRangeTx.step = 0.0f;
+
+        m_loRangeRx.max = 0.0f;
+        m_loRangeRx.min = 0.0f;
+        m_loRangeRx.step = 0.0f;
+
+        m_loRangeTx.max = 0.0f;
+        m_loRangeTx.min = 0.0f;
+        m_loRangeTx.step = 0.0f;
+
+        m_srRangeRx.max = 0.0f;
+        m_srRangeRx.min = 0.0f;
+        m_srRangeRx.step = 0.0f;
+
+        m_srRangeTx.max = 0.0f;
+        m_srRangeTx.min = 0.0f;
+        m_srRangeTx.step = 0.0f;
     }
 
     /**
diff --git a/plugins/channelrx/demodbfm/bfmdemod.cpp b/plugins/channelrx/demodbfm/bfmdemod.cpp
index e5a22fe3f..7ce345792 100644
--- a/plugins/channelrx/demodbfm/bfmdemod.cpp
+++ b/plugins/channelrx/demodbfm/bfmdemod.cpp
@@ -232,18 +232,12 @@ void BFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
 					Real deemph_l, deemph_r; // Pre-emphasis is applied on each channel before multiplexing
 					m_deemphasisFilterX.process(ci.real() + sampleStereo, deemph_l);
 					m_deemphasisFilterY.process(ci.real() - sampleStereo, deemph_r);
-					if (m_settings.m_lsbStereo)
-					{
-						m_audioBuffer[m_audioBufferFill].l = (qint16)(deemph_l * (1<<12) * m_settings.m_volume);
-						m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_settings.m_volume);
-						if (m_settings.m_copyAudioToUDP) m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
-					}
-					else
-					{
-						m_audioBuffer[m_audioBufferFill].l = (qint16)(deemph_l * (1<<12) * m_settings.m_volume);
-						m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_settings.m_volume);
-                        if (m_settings.m_copyAudioToUDP) m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
-					}
+                    m_audioBuffer[m_audioBufferFill].l = (qint16)(deemph_l * (1<<12) * m_settings.m_volume);
+                    m_audioBuffer[m_audioBufferFill].r = (qint16)(deemph_r * (1<<12) * m_settings.m_volume);
+
+                    if (m_settings.m_copyAudioToUDP) {
+                        m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
+                    }
 				}
 				else
 				{
@@ -252,7 +246,10 @@ void BFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
 					quint16 sample = (qint16)(deemph * (1<<12) * m_settings.m_volume);
 					m_audioBuffer[m_audioBufferFill].l = sample;
 					m_audioBuffer[m_audioBufferFill].r = sample;
-                    if (m_settings.m_copyAudioToUDP) m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
+
+					if (m_settings.m_copyAudioToUDP) {
+                        m_udpBufferAudio->write(m_audioBuffer[m_audioBufferFill]);
+                    }
 				}
 
 				++m_audioBufferFill;
diff --git a/plugins/channeltx/modatv/atvmod.cpp b/plugins/channeltx/modatv/atvmod.cpp
index 01ae25a16..56cb8f5b8 100644
--- a/plugins/channeltx/modatv/atvmod.cpp
+++ b/plugins/channeltx/modatv/atvmod.cpp
@@ -448,7 +448,7 @@ void ATVMod::pullVideo(Real& sample)
                     resizeCamera();
                 }
 
-                if (camera.m_videoFPSCount < camera.m_videoFPSManualEnable ? camera.m_videoFPSManual : camera.m_videoFPS)
+                if (camera.m_videoFPSCount < (camera.m_videoFPSManualEnable ? camera.m_videoFPSManual : camera.m_videoFPS))
                 {
                     camera.m_videoPrevFPSCount = (int) camera.m_videoFPSCount;
                     camera.m_videoFPSCount += (camera.m_videoFPSManualEnable ? camera.m_videoFPSqManual : camera.m_videoFPSq);
@@ -456,7 +456,7 @@ void ATVMod::pullVideo(Real& sample)
                 else
                 {
                     camera.m_videoPrevFPSCount = 0;
-                    camera.m_videoFPSCount = camera.m_videoFPSManualEnable ? camera.m_videoFPSqManual : camera.m_videoFPSq;
+                    camera.m_videoFPSCount = (camera.m_videoFPSManualEnable ? camera.m_videoFPSqManual : camera.m_videoFPSq);
                 }
             }
         }
diff --git a/plugins/channeltx/udpsink/udpsinkudphandler.cpp b/plugins/channeltx/udpsink/udpsinkudphandler.cpp
index ef84c4c24..b37134d10 100644
--- a/plugins/channeltx/udpsink/udpsinkudphandler.cpp
+++ b/plugins/channeltx/udpsink/udpsinkudphandler.cpp
@@ -16,6 +16,7 @@
 
 #include <QDebug>
 #include <stdint.h>
+#include <algorithm>
 
 #include "udpsinkmsg.h"
 #include "udpsinkudphandler.h"
@@ -41,6 +42,7 @@ UDPSinkUDPHandler::UDPSinkUDPHandler() :
     m_feedbackMessageQueue(0)
 {
     m_udpBuf = new udpBlk_t[m_minNbUDPFrames];
+    std::fill(m_udpDump, m_udpDump + m_udpBlockSize + 8192, 0);
     connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleMessages()));
 }
 
@@ -180,7 +182,8 @@ void UDPSinkUDPHandler::advanceReadPointer(int nbBytes)
         else
         {
             m_rwDelta = m_writeIndex; // raw R/W delta estimate
-            float d = (m_rwDelta - (m_nbUDPFrames/2))/(float) m_nbUDPFrames;
+            int nbUDPFrames2 = m_nbUDPFrames/2;
+            float d = (m_rwDelta - nbUDPFrames2)/(float) m_nbUDPFrames;
             //qDebug("UDPSinkUDPHandler::advanceReadPointer: w: %02d d: %f", m_writeIndex, d);
 
             if ((d < -0.45) || (d > 0.45))
diff --git a/plugins/samplesink/bladerfoutput/bladerfoutput.cpp b/plugins/samplesink/bladerfoutput/bladerfoutput.cpp
index 1b3f08147..2bfd38ee1 100644
--- a/plugins/samplesink/bladerfoutput/bladerfoutput.cpp
+++ b/plugins/samplesink/bladerfoutput/bladerfoutput.cpp
@@ -134,12 +134,7 @@ bool BladerfOutput::start()
 
     if (m_running) stop();
 
-	if((m_bladerfThread = new BladerfOutputThread(m_dev, &m_sampleSourceFifo)) == 0)
-	{
-		qCritical("BladerfOutput::start: out of memory");
-        stop();
-        return false;
-	}
+    m_bladerfThread = new BladerfOutputThread(m_dev, &m_sampleSourceFifo);
 
 //	mutexLocker.unlock();
 	applySettings(m_settings, true);
diff --git a/plugins/samplesink/bladerfoutput/bladerfoutputplugin.cpp b/plugins/samplesink/bladerfoutput/bladerfoutputplugin.cpp
index 31e626882..a8a484d99 100644
--- a/plugins/samplesink/bladerfoutput/bladerfoutputplugin.cpp
+++ b/plugins/samplesink/bladerfoutput/bladerfoutputplugin.cpp
@@ -58,23 +58,23 @@ PluginInterface::SamplingDevices BladerfOutputPlugin::enumSampleSinks()
 
 	int count = bladerf_get_device_list(&devinfo);
 
-	for(int i = 0; i < count; i++)
-	{
-		QString displayedName(QString("BladeRF[%1] %2").arg(devinfo[i].instance).arg(devinfo[i].serial));
-
-		result.append(SamplingDevice(displayedName,
-		        m_hardwareID,
-				m_deviceTypeID,
-				QString(devinfo[i].serial),
-				i,
-				PluginInterface::SamplingDevice::PhysicalDevice,
-				false,
-				1,
-				0));
-	}
-
 	if (devinfo)
 	{
+        for(int i = 0; i < count; i++)
+        {
+            QString displayedName(QString("BladeRF[%1] %2").arg(devinfo[i].instance).arg(devinfo[i].serial));
+
+            result.append(SamplingDevice(displayedName,
+                    m_hardwareID,
+                    m_deviceTypeID,
+                    QString(devinfo[i].serial),
+                    i,
+                    PluginInterface::SamplingDevice::PhysicalDevice,
+                    false,
+                    1,
+                    0));
+        }
+
 		bladerf_free_device_list(devinfo); // Valgrind memcheck
 	}
 
diff --git a/plugins/samplesink/bladerfoutput/bladerfoutputthread.cpp b/plugins/samplesink/bladerfoutput/bladerfoutputthread.cpp
index 94eddc475..daa028e66 100644
--- a/plugins/samplesink/bladerfoutput/bladerfoutputthread.cpp
+++ b/plugins/samplesink/bladerfoutput/bladerfoutputthread.cpp
@@ -16,6 +16,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <algorithm>
 #include "bladerfoutputthread.h"
 
 
@@ -28,6 +29,7 @@ BladerfOutputThread::BladerfOutputThread(struct bladerf* dev, SampleSourceFifo*
 	m_log2Interp(0),
 	m_fcPos(0)
 {
+    std::fill(m_buf, m_buf + 2*BLADERFOUTPUT_BLOCKSIZE, 0);
 }
 
 BladerfOutputThread::~BladerfOutputThread()
diff --git a/plugins/samplesink/filesink/filesinkoutput.cpp b/plugins/samplesink/filesink/filesinkoutput.cpp
index 1e1d302b2..b7e47615c 100644
--- a/plugins/samplesink/filesink/filesinkoutput.cpp
+++ b/plugins/samplesink/filesink/filesinkoutput.cpp
@@ -90,13 +90,7 @@ bool FileSinkOutput::start()
 
 	openFileStream();
 
-	if((m_fileSinkThread = new FileSinkThread(&m_ofstream, &m_sampleSourceFifo)) == 0)
-	{
-	    qCritical("out of memory");
-		stop();
-		return false;
-	}
-
+	m_fileSinkThread = new FileSinkThread(&m_ofstream, &m_sampleSourceFifo);
 	m_fileSinkThread->setSamplerate(m_settings.m_sampleRate);
 	m_fileSinkThread->setLog2Interpolation(m_settings.m_log2Interp);
 	m_fileSinkThread->connectTimer(m_masterTimer);
diff --git a/plugins/samplesink/hackrfoutput/hackrfoutput.cpp b/plugins/samplesink/hackrfoutput/hackrfoutput.cpp
index 7e497f8f2..2fb819264 100644
--- a/plugins/samplesink/hackrfoutput/hackrfoutput.cpp
+++ b/plugins/samplesink/hackrfoutput/hackrfoutput.cpp
@@ -116,12 +116,7 @@ bool HackRFOutput::start()
 
     if (m_running) stop();
 
-	if((m_hackRFThread = new HackRFOutputThread(m_dev, &m_sampleSourceFifo)) == 0)
-	{
-	    qCritical("HackRFOutput::start: out of memory");
-		stop();
-		return false;
-	}
+    m_hackRFThread = new HackRFOutputThread(m_dev, &m_sampleSourceFifo);
 
 //	mutexLocker.unlock();
 
diff --git a/plugins/samplesink/hackrfoutput/hackrfoutputthread.cpp b/plugins/samplesink/hackrfoutput/hackrfoutputthread.cpp
index 12f497976..0223c33b8 100644
--- a/plugins/samplesink/hackrfoutput/hackrfoutputthread.cpp
+++ b/plugins/samplesink/hackrfoutput/hackrfoutputthread.cpp
@@ -29,6 +29,7 @@ HackRFOutputThread::HackRFOutputThread(hackrf_device* dev, SampleSourceFifo* sam
 	m_sampleFifo(sampleFifo),
 	m_log2Interp(0)
 {
+    std::fill(m_buf, m_buf + 2*HACKRF_BLOCKSIZE, 0);
 }
 
 HackRFOutputThread::~HackRFOutputThread()
diff --git a/plugins/samplesink/limesdroutput/limesdroutput.cpp b/plugins/samplesink/limesdroutput/limesdroutput.cpp
index 7b2aac50a..6650f3618 100644
--- a/plugins/samplesink/limesdroutput/limesdroutput.cpp
+++ b/plugins/samplesink/limesdroutput/limesdroutput.cpp
@@ -111,9 +111,6 @@ bool LimeSDROutput::openDevice()
 
         // check if the requested channel is busy and abort if so (should not happen if device management is working correctly)
 
-        char *busyChannels = new char[deviceParams->m_nbTxChannels];
-        memset(busyChannels, 0, deviceParams->m_nbTxChannels);
-
         for (unsigned int i = 0; i < m_deviceAPI->getSinkBuddies().size(); i++)
         {
             DeviceSinkAPI *buddy = m_deviceAPI->getSinkBuddies()[i];
@@ -122,13 +119,11 @@ bool LimeSDROutput::openDevice()
             if (buddyShared->m_channel == requestedChannel)
             {
                 qCritical("LimeSDROutput::openDevice: cannot open busy channel %u", requestedChannel);
-                delete[] busyChannels;
                 return false;
             }
         }
 
         m_deviceShared.m_channel = requestedChannel; // acknowledge the requested channel
-        delete[] busyChannels;
     }
     // look for Rx buddies and get reference to common parameters
     // take the first Rx channel
@@ -370,20 +365,12 @@ bool LimeSDROutput::start()
         return false;
     }
 
-    applySettings(m_settings, true);
-
     // start / stop streaming is done in the thread.
 
-    if ((m_limeSDROutputThread = new LimeSDROutputThread(&m_streamId, &m_sampleSourceFifo)) == 0)
-    {
-        qCritical("LimeSDROutput::start: cannot create thread");
-        stop();
-        return false;
-    }
-    else
-    {
-        qDebug("LimeSDROutput::start: thread created");
-    }
+    m_limeSDROutputThread = new LimeSDROutputThread(&m_streamId, &m_sampleSourceFifo);
+    qDebug("LimeSDROutput::start: thread created");
+
+    applySettings(m_settings, true);
 
     m_limeSDROutputThread->setLog2Interpolation(m_settings.m_log2SoftInterp);
 
diff --git a/plugins/samplesink/limesdroutput/limesdroutputthread.cpp b/plugins/samplesink/limesdroutput/limesdroutputthread.cpp
index 218f35523..3dac3cf8f 100644
--- a/plugins/samplesink/limesdroutput/limesdroutputthread.cpp
+++ b/plugins/samplesink/limesdroutput/limesdroutputthread.cpp
@@ -15,6 +15,7 @@
 ///////////////////////////////////////////////////////////////////////////////////
 
 #include <errno.h>
+#include <algorithm>
 
 #include "limesdroutputthread.h"
 #include "limesdroutputsettings.h"
@@ -27,6 +28,7 @@ LimeSDROutputThread::LimeSDROutputThread(lms_stream_t* stream, SampleSourceFifo*
     m_log2Interp(0),
     m_fcPos(LimeSDROutputSettings::FC_POS_CENTER)
 {
+    std::fill(m_buf, m_buf + 2*LIMESDROUTPUT_BLOCKSIZE, 0);
 }
 
 LimeSDROutputThread::~LimeSDROutputThread()
diff --git a/plugins/samplesink/plutosdroutput/plutosdroutput.cpp b/plugins/samplesink/plutosdroutput/plutosdroutput.cpp
index 6d8d90aed..374ab452c 100644
--- a/plugins/samplesink/plutosdroutput/plutosdroutput.cpp
+++ b/plugins/samplesink/plutosdroutput/plutosdroutput.cpp
@@ -42,6 +42,13 @@ PlutoSDROutput::PlutoSDROutput(DeviceSinkAPI *deviceAPI) :
     m_plutoTxBuffer(0),
     m_plutoSDROutputThread(0)
 {
+    m_deviceSampleRates.m_addaConnvRate = 0;
+    m_deviceSampleRates.m_bbRateHz = 0;
+    m_deviceSampleRates.m_firRate = 0;
+    m_deviceSampleRates.m_hb1Rate = 0;
+    m_deviceSampleRates.m_hb2Rate = 0;
+    m_deviceSampleRates.m_hb3Rate = 0;
+
     suspendBuddies();
     openDevice();
     resumeBuddies();
@@ -72,20 +79,12 @@ bool PlutoSDROutput::start()
 
     if (m_running) stop();
 
-    applySettings(m_settings, true);
-
     // start / stop streaming is done in the thread.
 
-    if ((m_plutoSDROutputThread = new PlutoSDROutputThread(PLUTOSDR_BLOCKSIZE_SAMPLES, m_deviceShared.m_deviceParams->getBox(), &m_sampleSourceFifo)) == 0)
-    {
-        qCritical("PlutoSDROutput::start: cannot create thread");
-        stop();
-        return false;
-    }
-    else
-    {
-        qDebug("PlutoSDROutput::start: thread created");
-    }
+    m_plutoSDROutputThread = new PlutoSDROutputThread(PLUTOSDR_BLOCKSIZE_SAMPLES, m_deviceShared.m_deviceParams->getBox(), &m_sampleSourceFifo);
+    qDebug("PlutoSDROutput::start: thread created");
+
+    applySettings(m_settings, true);
 
     m_plutoSDROutputThread->setLog2Interpolation(m_settings.m_log2Interp);
     m_plutoSDROutputThread->startWork();
@@ -257,11 +256,9 @@ bool PlutoSDROutput::openDevice()
     m_deviceAPI->setBuddySharedPtr(&m_deviceShared); // propagate common parameters to API
 
     // acquire the channel
-    suspendBuddies();
     DevicePlutoSDRBox *plutoBox =  m_deviceShared.m_deviceParams->getBox();
     plutoBox->openTx();
     m_plutoTxBuffer = plutoBox->createTxBuffer(PLUTOSDR_BLOCKSIZE_SAMPLES, false); // PlutoSDR buffer size is counted in number of (I,Q) samples
-    resumeBuddies();
 
     return true;
 }
diff --git a/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkgui.cpp b/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkgui.cpp
index 3e844d322..96773dc4c 100644
--- a/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkgui.cpp
+++ b/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkgui.cpp
@@ -601,15 +601,11 @@ void SDRdaemonSinkGui::tick()
                         samplesCorr = 127*8;
                         quickStart = true;
                     }
-                    else if (queueLength < 8)
+                    else if (queueLength < 16)
                     {
                         samplesCorr = ((8 - queueLength)*16)/m_nbSinceLastFlowCheck;
                     }
-                    else if (queueLength > 8)
-                    {
-                        samplesCorr = ((8 - queueLength)*16)/m_nbSinceLastFlowCheck;
-                    }
-                    else if (queueLength > 16)
+                    else
                     {
                         samplesCorr = -127*16;
                         quickStart = true;
diff --git a/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkoutput.cpp b/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkoutput.cpp
index 23fed01e9..f9469cb3e 100644
--- a/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkoutput.cpp
+++ b/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkoutput.cpp
@@ -64,12 +64,7 @@ bool SDRdaemonSinkOutput::start()
 	QMutexLocker mutexLocker(&m_mutex);
 	qDebug() << "SDRdaemonSinkOutput::start";
 
-	if((m_sdrDaemonSinkThread = new SDRdaemonSinkThread(&m_sampleSourceFifo)) == 0)
-	{
-	    qCritical("out of memory");
-		stop();
-		return false;
-	}
+	m_sdrDaemonSinkThread = new SDRdaemonSinkThread(&m_sampleSourceFifo);
 	m_sdrDaemonSinkThread->setRemoteAddress(m_settings.m_address, m_settings.m_dataPort);
 	m_sdrDaemonSinkThread->setCenterFrequency(m_settings.m_centerFrequency);
 	m_sdrDaemonSinkThread->setSamplerate(m_settings.m_sampleRate);
diff --git a/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkthread.h b/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkthread.h
index 6a17cdd4e..581a6cb88 100644
--- a/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkthread.h
+++ b/plugins/samplesink/sdrdaemonsink/sdrdaemonsinkthread.h
@@ -63,7 +63,7 @@ public:
 private:
 	QMutex m_startWaitMutex;
 	QWaitCondition m_startWaiter;
-	bool m_running;
+	volatile bool m_running;
 
 	int m_samplesChunkSize;
 	SampleSourceFifo* m_sampleFifo;
diff --git a/plugins/samplesink/sdrdaemonsink/udpsinkfec.cpp b/plugins/samplesink/sdrdaemonsink/udpsinkfec.cpp
index 3637c29fa..ce7747b2e 100644
--- a/plugins/samplesink/sdrdaemonsink/udpsinkfec.cpp
+++ b/plugins/samplesink/sdrdaemonsink/udpsinkfec.cpp
@@ -115,7 +115,7 @@ void UDPSinkFEC::write(const SampleVector::iterator& begin, uint32_t sampleChunk
 
             metaData.m_crc32 = crc32.checksum();
 
-            memset((void *) &m_superBlock, 0, m_udpSize);
+            memset((void *) &m_superBlock, 0, sizeof(m_superBlock));
 
             m_superBlock.header.frameIndex = m_frameCount;
             m_superBlock.header.blockIndex = m_txBlockIndex;
diff --git a/plugins/samplesink/sdrdaemonsink/udpsinkfec.h b/plugins/samplesink/sdrdaemonsink/udpsinkfec.h
index a0a374e24..825a4b12a 100644
--- a/plugins/samplesink/sdrdaemonsink/udpsinkfec.h
+++ b/plugins/samplesink/sdrdaemonsink/udpsinkfec.h
@@ -244,7 +244,7 @@ private slots:
 private:
     void encodeAndTransmit(UDPSinkFEC::SuperBlock *txBlockx, uint16_t frameIndex, uint32_t nbBlocksFEC, uint32_t txDelay);
 
-    bool m_running;
+    volatile bool m_running;
     CM256 m_cm256;                       //!< CM256 library object
     bool m_cm256Valid;                   //!< true if CM256 library is initialized correctly
     UDPSocket    m_socket;
diff --git a/plugins/samplesource/airspy/airspyinput.cpp b/plugins/samplesource/airspy/airspyinput.cpp
index ae0c53355..450c46a30 100644
--- a/plugins/samplesource/airspy/airspyinput.cpp
+++ b/plugins/samplesource/airspy/airspyinput.cpp
@@ -161,15 +161,9 @@ bool AirspyInput::start()
         return false;
     }
 
-    if (m_running) stop();
-
-	if((m_airspyThread = new AirspyThread(m_dev, &m_sampleFifo)) == 0)
-	{
-	    qCritical("AirspyInput::start: out of memory");
-		stop();
-		return false;
-	}
+    if (m_running) { stop(); }
 
+	m_airspyThread = new AirspyThread(m_dev, &m_sampleFifo);
 	m_airspyThread->setSamplerate(m_sampleRates[m_settings.m_devSampleRateIndex]);
 	m_airspyThread->setLog2Decimation(m_settings.m_log2Decim);
 	m_airspyThread->setFcPos((int) m_settings.m_fcPos);
diff --git a/plugins/samplesource/airspy/airspythread.cpp b/plugins/samplesource/airspy/airspythread.cpp
index 3b2424ba5..7d03055d4 100644
--- a/plugins/samplesource/airspy/airspythread.cpp
+++ b/plugins/samplesource/airspy/airspythread.cpp
@@ -16,6 +16,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <algorithm>
 
 #include "airspythread.h"
 
@@ -34,6 +35,7 @@ AirspyThread::AirspyThread(struct airspy_device* dev, SampleSinkFifo* sampleFifo
 	m_fcPos(0)
 {
 	m_this = this;
+	std::fill(m_buf, m_buf + 2*AIRSPY_BLOCKSIZE, 0);
 }
 
 AirspyThread::~AirspyThread()
diff --git a/plugins/samplesource/bladerfinput/bladerfinput.cpp b/plugins/samplesource/bladerfinput/bladerfinput.cpp
index 8a655c874..ef4901a13 100644
--- a/plugins/samplesource/bladerfinput/bladerfinput.cpp
+++ b/plugins/samplesource/bladerfinput/bladerfinput.cpp
@@ -146,12 +146,7 @@ bool BladerfInput::start()
 
     if (m_running) stop();
 
-	if((m_bladerfThread = new BladerfInputThread(m_dev, &m_sampleFifo)) == 0) {
-	    qCritical("BladerfInput::start: out of memory");
-		stop();
-		return false;
-	}
-
+	m_bladerfThread = new BladerfInputThread(m_dev, &m_sampleFifo);
 	m_bladerfThread->setLog2Decimation(m_settings.m_log2Decim);
 	m_bladerfThread->setFcPos((int) m_settings.m_fcPos);
 
diff --git a/plugins/samplesource/bladerfinput/bladerfinputplugin.cpp b/plugins/samplesource/bladerfinput/bladerfinputplugin.cpp
index 288d56cbb..02a2ebd34 100644
--- a/plugins/samplesource/bladerfinput/bladerfinputplugin.cpp
+++ b/plugins/samplesource/bladerfinput/bladerfinputplugin.cpp
@@ -59,23 +59,23 @@ PluginInterface::SamplingDevices BlderfInputPlugin::enumSampleSources()
 
 	int count = bladerf_get_device_list(&devinfo);
 
-	for(int i = 0; i < count; i++)
-	{
-		QString displayedName(QString("BladeRF[%1] %2").arg(devinfo[i].instance).arg(devinfo[i].serial));
+    if (devinfo)
+    {
+        for(int i = 0; i < count; i++)
+        {
+            QString displayedName(QString("BladeRF[%1] %2").arg(devinfo[i].instance).arg(devinfo[i].serial));
 
-		result.append(SamplingDevice(displayedName,
-		        m_hardwareID,
-				m_deviceTypeID,
-				QString(devinfo[i].serial),
-				i,
-				PluginInterface::SamplingDevice::PhysicalDevice,
-				true,
-				1,
-				0));
-	}
+            result.append(SamplingDevice(displayedName,
+                    m_hardwareID,
+                    m_deviceTypeID,
+                    QString(devinfo[i].serial),
+                    i,
+                    PluginInterface::SamplingDevice::PhysicalDevice,
+                    true,
+                    1,
+                    0));
+        }
 
-	if (devinfo)
-	{
 		bladerf_free_device_list(devinfo); // Valgrind memcheck
 	}
 
diff --git a/plugins/samplesource/bladerfinput/bladerfinputthread.cpp b/plugins/samplesource/bladerfinput/bladerfinputthread.cpp
index 7805d91fa..e0dec6855 100644
--- a/plugins/samplesource/bladerfinput/bladerfinputthread.cpp
+++ b/plugins/samplesource/bladerfinput/bladerfinputthread.cpp
@@ -18,6 +18,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <algorithm>
 #include "dsp/samplesinkfifo.h"
 
 
@@ -31,6 +32,7 @@ BladerfInputThread::BladerfInputThread(struct bladerf* dev, SampleSinkFifo* samp
 	m_log2Decim(0),
 	m_fcPos(0)
 {
+    std::fill(m_buf, m_buf + 2*BLADERF_BLOCKSIZE, 0);
 }
 
 BladerfInputThread::~BladerfInputThread()
diff --git a/plugins/samplesource/fcdpro/fcdproinput.cpp b/plugins/samplesource/fcdpro/fcdproinput.cpp
index 314581121..e02e5df17 100644
--- a/plugins/samplesource/fcdpro/fcdproinput.cpp
+++ b/plugins/samplesource/fcdpro/fcdproinput.cpp
@@ -121,12 +121,7 @@ bool FCDProInput::start()
 		return false;
 	}
 
-	if ((m_FCDThread = new FCDProThread(&m_sampleFifo)) == NULL)
-	{
-	    qCritical("out of memory");
-		return false;
-	}
-
+	m_FCDThread = new FCDProThread(&m_sampleFifo);
 	m_FCDThread->startWork();
 
 //	mutexLocker.unlock();
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
index e350933f0..92be2bab8 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
@@ -115,12 +115,7 @@ bool FCDProPlusInput::start()
 		return false;
 	}
 
-	if ((m_FCDThread = new FCDProPlusThread(&m_sampleFifo)) == NULL)
-	{
-	    qCritical("out of memory");
-		return false;
-	}
-
+	m_FCDThread = new FCDProPlusThread(&m_sampleFifo);
 	m_FCDThread->startWork();
 
 //	mutexLocker.unlock();
diff --git a/plugins/samplesource/filesource/filesourceinput.cpp b/plugins/samplesource/filesource/filesourceinput.cpp
index 6a6a8f946..b7b859c85 100644
--- a/plugins/samplesource/filesource/filesourceinput.cpp
+++ b/plugins/samplesource/filesource/filesourceinput.cpp
@@ -145,12 +145,7 @@ bool FileSourceInput::start()
 
 	//openFileStream();
 
-	if((m_fileSourceThread = new FileSourceThread(&m_ifstream, &m_sampleFifo)) == NULL) {
-	    qCritical("out of memory");
-		stop();
-		return false;
-	}
-
+	m_fileSourceThread = new FileSourceThread(&m_ifstream, &m_sampleFifo);
 	m_fileSourceThread->setSampleRateAndSize(m_sampleRate, m_sampleSize);
 	m_fileSourceThread->connectTimer(m_masterTimer);
 	m_fileSourceThread->startWork();
diff --git a/plugins/samplesource/hackrfinput/hackrfinput.cpp b/plugins/samplesource/hackrfinput/hackrfinput.cpp
index 29c3a74a1..3c51c7fad 100644
--- a/plugins/samplesource/hackrfinput/hackrfinput.cpp
+++ b/plugins/samplesource/hackrfinput/hackrfinput.cpp
@@ -132,12 +132,7 @@ bool HackRFInput::start()
 
     if (m_running) stop();
 
-	if ((m_hackRFThread = new HackRFInputThread(m_dev, &m_sampleFifo)) == 0)
-	{
-	    qCritical("HackRFInput::start: out of memory");
-		stop();
-		return false;
-	}
+    m_hackRFThread = new HackRFInputThread(m_dev, &m_sampleFifo);
 
 //	mutexLocker.unlock();
 
diff --git a/plugins/samplesource/hackrfinput/hackrfinputthread.cpp b/plugins/samplesource/hackrfinput/hackrfinputthread.cpp
index db002490a..c0a9dfc57 100644
--- a/plugins/samplesource/hackrfinput/hackrfinputthread.cpp
+++ b/plugins/samplesource/hackrfinput/hackrfinputthread.cpp
@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>
+#include <algorithm>
 
 #include "dsp/samplesinkfifo.h"
 
@@ -32,6 +33,7 @@ HackRFInputThread::HackRFInputThread(hackrf_device* dev, SampleSinkFifo* sampleF
 	m_log2Decim(0),
 	m_fcPos(0)
 {
+    std::fill(m_buf, m_buf + 2*HACKRF_BLOCKSIZE, 0);
 }
 
 HackRFInputThread::~HackRFInputThread()
diff --git a/plugins/samplesource/limesdrinput/limesdrinput.cpp b/plugins/samplesource/limesdrinput/limesdrinput.cpp
index f30b3270a..da15bf064 100644
--- a/plugins/samplesource/limesdrinput/limesdrinput.cpp
+++ b/plugins/samplesource/limesdrinput/limesdrinput.cpp
@@ -129,9 +129,6 @@ bool LimeSDRInput::openDevice()
 
         // check if the requested channel is busy and abort if so (should not happen if device management is working correctly)
 
-        char *busyChannels = new char[deviceParams->m_nbRxChannels];
-        memset(busyChannels, 0, deviceParams->m_nbRxChannels);
-
         for (unsigned int i = 0; i < m_deviceAPI->getSourceBuddies().size(); i++)
         {
             DeviceSourceAPI *buddy = m_deviceAPI->getSourceBuddies()[i];
@@ -140,13 +137,11 @@ bool LimeSDRInput::openDevice()
             if (buddyShared->m_channel == requestedChannel)
             {
                 qCritical("LimeSDRInput::openDevice: cannot open busy channel %u", requestedChannel);
-                delete[] busyChannels;
                 return false;
             }
         }
 
         m_deviceShared.m_channel = requestedChannel; // acknowledge the requested channel
-        delete[] busyChannels;
     }
     // look for Tx buddies and get reference to common parameters
     // take the first Rx channel
@@ -389,20 +384,12 @@ bool LimeSDRInput::start()
         return false;
     }
 
-    applySettings(m_settings, true);
-
     // start / stop streaming is done in the thread.
 
-    if ((m_limeSDRInputThread = new LimeSDRInputThread(&m_streamId, &m_sampleFifo)) == 0)
-    {
-        qCritical("LimeSDRInput::start: cannot create thread");
-        stop();
-        return false;
-    }
-    else
-    {
-        qDebug("LimeSDRInput::start: thread created");
-    }
+    m_limeSDRInputThread = new LimeSDRInputThread(&m_streamId, &m_sampleFifo);
+    qDebug("LimeSDRInput::start: thread created");
+
+    applySettings(m_settings, true);
 
     m_limeSDRInputThread->setLog2Decimation(m_settings.m_log2SoftDecim);
 
diff --git a/plugins/samplesource/limesdrinput/limesdrinputthread.cpp b/plugins/samplesource/limesdrinput/limesdrinputthread.cpp
index 5d32b4060..208455b30 100644
--- a/plugins/samplesource/limesdrinput/limesdrinputthread.cpp
+++ b/plugins/samplesource/limesdrinput/limesdrinputthread.cpp
@@ -15,6 +15,7 @@
 ///////////////////////////////////////////////////////////////////////////////////
 
 #include <errno.h>
+#include <algorithm>
 
 #include "limesdrinputsettings.h"
 #include "limesdrinputthread.h"
@@ -27,6 +28,7 @@ LimeSDRInputThread::LimeSDRInputThread(lms_stream_t* stream, SampleSinkFifo* sam
     m_sampleFifo(sampleFifo),
     m_log2Decim(0)
 {
+    std::fill(m_buf, m_buf + 2*LIMESDR_BLOCKSIZE, 0);
 }
 
 LimeSDRInputThread::~LimeSDRInputThread()
diff --git a/plugins/samplesource/perseus/perseusinput.cpp b/plugins/samplesource/perseus/perseusinput.cpp
index 893accd0a..50f45c380 100644
--- a/plugins/samplesource/perseus/perseusinput.cpp
+++ b/plugins/samplesource/perseus/perseusinput.cpp
@@ -68,20 +68,12 @@ bool PerseusInput::start()
 {
     if (m_running) stop();
 
-    applySettings(m_settings, true);
-
     // start / stop streaming is done in the thread.
 
-    if ((m_perseusThread = new PerseusThread(m_perseusDescriptor, &m_sampleFifo)) == 0)
-    {
-        qCritical("PerseusInput::start: cannot create thread");
-        stop();
-        return false;
-    }
-    else
-    {
-        qDebug("PerseusInput::start: thread created");
-    }
+    m_perseusThread = new PerseusThread(m_perseusDescriptor, &m_sampleFifo);
+    qDebug("PerseusInput::start: thread created");
+
+    applySettings(m_settings, true);
 
     m_perseusThread->setLog2Decimation(m_settings.m_log2Decim);
     m_perseusThread->startWork();
diff --git a/plugins/samplesource/perseus/perseusthread.cpp b/plugins/samplesource/perseus/perseusthread.cpp
index a64b84e47..ec0441a78 100644
--- a/plugins/samplesource/perseus/perseusthread.cpp
+++ b/plugins/samplesource/perseus/perseusthread.cpp
@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2018 Edouard Griffiths, F4EXB                                   //
+        // Copyright (C) 2018 Edouard Griffiths, F4EXB                                   //
 //                                                                               //
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
@@ -15,6 +15,7 @@
 ///////////////////////////////////////////////////////////////////////////////////
 
 #include <QtGlobal>
+#include <algorithm>
 #include "perseusthread.h"
 
 PerseusThread *PerseusThread::m_this = 0;
@@ -28,6 +29,7 @@ PerseusThread::PerseusThread(perseus_descr* dev, SampleSinkFifo* sampleFifo, QOb
     m_log2Decim(0)
 {
     m_this = this;
+    std::fill(m_buf, m_buf + 2*PERSEUS_NBSAMPLES, 0);
 }
 
 PerseusThread::~PerseusThread()
diff --git a/plugins/samplesource/perseus/perseusthread.h b/plugins/samplesource/perseus/perseusthread.h
index 6fe21e93d..46d75c649 100644
--- a/plugins/samplesource/perseus/perseusthread.h
+++ b/plugins/samplesource/perseus/perseusthread.h
@@ -42,7 +42,7 @@ public:
 private:
 	QMutex m_startWaitMutex;
 	QWaitCondition m_startWaiter;
-	bool m_running;
+	volatile bool m_running;
 
 	perseus_descr* m_dev;
 	qint32 m_buf[2*PERSEUS_NBSAMPLES];
diff --git a/plugins/samplesource/plutosdrinput/plutosdrinput.cpp b/plugins/samplesource/plutosdrinput/plutosdrinput.cpp
index 4025c3c5f..7086a02b0 100644
--- a/plugins/samplesource/plutosdrinput/plutosdrinput.cpp
+++ b/plugins/samplesource/plutosdrinput/plutosdrinput.cpp
@@ -44,6 +44,13 @@ PlutoSDRInput::PlutoSDRInput(DeviceSourceAPI *deviceAPI) :
     m_plutoRxBuffer(0),
     m_plutoSDRInputThread(0)
 {
+    m_deviceSampleRates.m_addaConnvRate = 0;
+    m_deviceSampleRates.m_bbRateHz = 0;
+    m_deviceSampleRates.m_firRate = 0;
+    m_deviceSampleRates.m_hb1Rate = 0;
+    m_deviceSampleRates.m_hb2Rate = 0;
+    m_deviceSampleRates.m_hb3Rate = 0;
+
     suspendBuddies();
     openDevice();
     resumeBuddies();
@@ -81,20 +88,12 @@ bool PlutoSDRInput::start()
 
     if (m_running) stop();
 
-    applySettings(m_settings, true);
-
     // start / stop streaming is done in the thread.
 
-    if ((m_plutoSDRInputThread = new PlutoSDRInputThread(PLUTOSDR_BLOCKSIZE_SAMPLES, m_deviceShared.m_deviceParams->getBox(), &m_sampleFifo)) == 0)
-    {
-        qCritical("PlutoSDRInput::start: cannot create thread");
-        stop();
-        return false;
-    }
-    else
-    {
-        qDebug("PlutoSDRInput::start: thread created");
-    }
+    m_plutoSDRInputThread = new PlutoSDRInputThread(PLUTOSDR_BLOCKSIZE_SAMPLES, m_deviceShared.m_deviceParams->getBox(), &m_sampleFifo);
+    qDebug("PlutoSDRInput::start: thread created");
+
+    applySettings(m_settings, true);
 
     m_plutoSDRInputThread->setLog2Decimation(m_settings.m_log2Decim);
     m_plutoSDRInputThread->startWork();
@@ -287,11 +286,9 @@ bool PlutoSDRInput::openDevice()
     m_deviceAPI->setBuddySharedPtr(&m_deviceShared); // propagate common parameters to API
 
     // acquire the channel
-    suspendBuddies();
     DevicePlutoSDRBox *plutoBox =  m_deviceShared.m_deviceParams->getBox();
     plutoBox->openRx();
     m_plutoRxBuffer = plutoBox->createRxBuffer(PLUTOSDR_BLOCKSIZE_SAMPLES, false);
-    resumeBuddies();
 
     return true;
 }
diff --git a/plugins/samplesource/rtlsdr/rtlsdrinput.cpp b/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
index 5a0b711dc..76156dc11 100644
--- a/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
+++ b/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
@@ -187,13 +187,7 @@ bool RTLSDRInput::start()
 
     if (m_running) stop();
 
-	if ((m_rtlSDRThread = new RTLSDRThread(m_dev, &m_sampleFifo)) == NULL)
-	{
-	    qCritical("RTLSDRInput::start: out of memory");
-		stop();
-		return false;
-	}
-
+	m_rtlSDRThread = new RTLSDRThread(m_dev, &m_sampleFifo);
 	m_rtlSDRThread->setSamplerate(m_settings.m_devSampleRate);
 	m_rtlSDRThread->setLog2Decimation(m_settings.m_log2Decim);
 	m_rtlSDRThread->setFcPos((int) m_settings.m_fcPos);
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcebuffer.cpp b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcebuffer.cpp
index 1ab67e08c..594434cf2 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcebuffer.cpp
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourcebuffer.cpp
@@ -18,6 +18,7 @@
 #include <cassert>
 #include <cstring>
 #include <cmath>
+#include <algorithm>
 #include <boost/crc.hpp>
 #include <boost/cstdint.hpp>
 #include "sdrdaemonsourcebuffer.h"
@@ -62,6 +63,9 @@ SDRdaemonSourceBuffer::SDRdaemonSourceBuffer(uint32_t throttlems) :
     } else {
         m_cm256_OK = true;
     }
+
+    std::fill(m_decoderSlots, m_decoderSlots + nbDecoderSlots, DecoderSlot());
+    std::fill(m_frames, m_frames + nbDecoderSlots, BufferFrame());
 }
 
 SDRdaemonSourceBuffer::~SDRdaemonSourceBuffer()
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp
index a60062a85..5ae6f0778 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.cpp
@@ -31,6 +31,7 @@ SDRdaemonSourceUDPHandler::SDRdaemonSourceUDPHandler(SampleSinkFifo *sampleFifo,
     m_masterTimer(deviceAPI->getMasterTimer()),
     m_masterTimerConnected(false),
     m_running(false),
+    m_rateDivider(1000/SDRDAEMONSOURCE_THROTTLE_MS),
 	m_sdrDaemonBuffer(m_rateDivider),
 	m_dataSocket(0),
 	m_dataAddress(QHostAddress::LocalHost),
@@ -54,7 +55,6 @@ SDRdaemonSourceUDPHandler::SDRdaemonSourceUDPHandler(SampleSinkFifo *sampleFifo,
     m_converterBuffer(0),
     m_converterBufferNbSamples(0),
     m_throttleToggle(false),
-    m_rateDivider(1000/SDRDAEMONSOURCE_THROTTLE_MS),
 	m_autoCorrBuffer(true)
 {
     m_udpBuf = new char[SDRdaemonSourceBuffer::m_udpPayloadSize];
diff --git a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h
index 0f686329a..bbb4c0799 100644
--- a/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h
+++ b/plugins/samplesource/sdrdaemonsource/sdrdaemonsourceudphandler.h
@@ -55,6 +55,7 @@ private:
 	const QTimer& m_masterTimer;
 	bool m_masterTimerConnected;
 	bool m_running;
+    uint32_t m_rateDivider;
 	SDRdaemonSourceBuffer m_sdrDaemonBuffer;
 	QUdpSocket *m_dataSocket;
 	QHostAddress m_dataAddress;
@@ -80,7 +81,6 @@ private:
     int32_t *m_converterBuffer;
     uint32_t m_converterBufferNbSamples;
     bool m_throttleToggle;
-    uint32_t m_rateDivider;
     bool m_autoCorrBuffer;
 
 	void connectTimer();
diff --git a/plugins/samplesource/sdrplay/sdrplayinput.cpp b/plugins/samplesource/sdrplay/sdrplayinput.cpp
index ce013c784..3dd8db149 100644
--- a/plugins/samplesource/sdrplay/sdrplayinput.cpp
+++ b/plugins/samplesource/sdrplay/sdrplayinput.cpp
@@ -168,12 +168,7 @@ bool SDRPlayInput::start()
 		return false;
 	}
 
-    if((m_sdrPlayThread = new SDRPlayThread(m_dev, &m_sampleFifo)) == 0)
-    {
-        qCritical("SDRPlayInput::start: failed to create thread");
-        return false;
-    }
-
+	m_sdrPlayThread = new SDRPlayThread(m_dev, &m_sampleFifo);
     m_sdrPlayThread->setLog2Decimation(m_settings.m_log2Decim);
     m_sdrPlayThread->setFcPos((int) m_settings.m_fcPos);
 
diff --git a/plugins/samplesource/testsource/testsourceinput.cpp b/plugins/samplesource/testsource/testsourceinput.cpp
index d1aa8d40a..4221c3a02 100644
--- a/plugins/samplesource/testsource/testsourceinput.cpp
+++ b/plugins/samplesource/testsource/testsourceinput.cpp
@@ -74,13 +74,7 @@ bool TestSourceInput::start()
 
     if (m_running) stop();
 
-	if ((m_testSourceThread = new TestSourceThread(&m_sampleFifo)) == 0)
-	{
-	    qCritical("TestSourceInput::start: out of memory");
-		stop();
-		return false;
-	}
-
+    m_testSourceThread = new TestSourceThread(&m_sampleFifo);
 	m_testSourceThread->setSamplerate(m_settings.m_sampleRate);
 	m_testSourceThread->connectTimer(m_masterTimer);
 	m_testSourceThread->startWork();
diff --git a/sdrbase/audio/audiofifo.cpp b/sdrbase/audio/audiofifo.cpp
index 92734fb84..78bdf4ea0 100644
--- a/sdrbase/audio/audiofifo.cpp
+++ b/sdrbase/audio/audiofifo.cpp
@@ -266,7 +266,6 @@ bool AudioFifo::create(uint32_t numSamples)
 		m_fifo = 0;
 	}
 
-	m_size = 0;
 	m_fill = 0;
 	m_head = 0;
 	m_tail = 0;
diff --git a/sdrbase/dsp/dvserialengine.cpp b/sdrbase/dsp/dvserialengine.cpp
index d042a2019..fa075382a 100644
--- a/sdrbase/dsp/dvserialengine.cpp
+++ b/sdrbase/dsp/dvserialengine.cpp
@@ -150,7 +150,7 @@ void DVSerialEngine::getComList()
     const char* sysdir = "/sys/class/tty/";
 
     // Scan through /sys/class/tty - it contains all tty-devices in the system
-    n = scandir(sysdir, &namelist, NULL, NULL);
+    n = scandir(sysdir, &namelist, NULL, alphasort);
     if (n < 0)
         perror("scandir");
     else
diff --git a/sdrbase/dsp/dvserialworker.cpp b/sdrbase/dsp/dvserialworker.cpp
index 8db6935a5..ed59009ee 100644
--- a/sdrbase/dsp/dvserialworker.cpp
+++ b/sdrbase/dsp/dvserialworker.cpp
@@ -33,6 +33,7 @@ DVSerialWorker::DVSerialWorker() :
     m_audioBuffer.resize(48000);
     m_audioBufferFill = 0;
     m_audioFifo = 0;
+    memset(m_dvAudioSamples, 0, SerialDV::MBE_AUDIO_BLOCK_SIZE*sizeof(short));
 }
 
 DVSerialWorker::~DVSerialWorker()
diff --git a/sdrbase/dsp/dvserialworker.h b/sdrbase/dsp/dvserialworker.h
index da7347037..52af0acdb 100644
--- a/sdrbase/dsp/dvserialworker.h
+++ b/sdrbase/dsp/dvserialworker.h
@@ -131,7 +131,7 @@ private:
     void upsample6(short *in, int nbSamplesIn, unsigned char channels);
 
     SerialDV::DVController m_dvController;
-    bool m_running;
+    volatile bool m_running;
     int m_currentGainIn;
     int m_currentGainOut;
     short m_dvAudioSamples[SerialDV::MBE_AUDIO_BLOCK_SIZE];
diff --git a/sdrbase/dsp/fftfilt.h b/sdrbase/dsp/fftfilt.h
index cb8c2b923..6318cf2d5 100644
--- a/sdrbase/dsp/fftfilt.h
+++ b/sdrbase/dsp/fftfilt.h
@@ -48,8 +48,9 @@ protected:
 	int window;
 
 	inline float fsinc(float fc, int i, int len) {
-		return (i == len/2) ? 2.0 * fc:
-				sin(2 * M_PI * fc * (i - (len/2))) / (M_PI * (i - (len/2)));
+	    int len2 = len/2;
+		return (i == len2) ? 2.0 * fc:
+				sin(2 * M_PI * fc * (i - len2)) / (M_PI * (i - len2));
 	}
 
 	inline float _blackman(int i, int len) {
diff --git a/sdrbase/util/doublebuffer.h b/sdrbase/util/doublebuffer.h
index 6e27b81f4..b76db989a 100644
--- a/sdrbase/util/doublebuffer.h
+++ b/sdrbase/util/doublebuffer.h
@@ -32,6 +32,25 @@ public:
 
 	~DoubleBufferSimple() {}
 
+	DoubleBufferSimple(const DoubleBufferSimple& other)
+	{
+	    m_size = other.m_size;
+	    m_data = other.m_data;
+	    m_current = m_data.begin();
+	}
+
+    DoubleBufferSimple& operator=(const DoubleBufferSimple& other)
+    {
+        if (&other == this) {
+            return *this;
+        }
+
+        m_size = other.m_size;
+        m_data = other.m_data;
+        m_current = m_data.begin();
+        return *this;
+    }
+
 	void resize(int size)
 	{
 	    m_size = size;
diff --git a/sdrbase/util/movingaverage.h b/sdrbase/util/movingaverage.h
index 326921526..4a6276f95 100644
--- a/sdrbase/util/movingaverage.h
+++ b/sdrbase/util/movingaverage.h
@@ -55,8 +55,8 @@ class MovingAverageUtil
         }
     }
 
-    double asDouble() const { return m_total / N; }
-    float asFloat() const { return m_total / N; }
+    double asDouble() const { return ((double)m_total) / N; }
+    float asFloat() const { return ((float)m_total) / N; }
     operator T() const { return  m_total / N; }
 
   private:
diff --git a/sdrgui/dsp/scopevismulti.cpp b/sdrgui/dsp/scopevismulti.cpp
index 42303f69a..7318d18cb 100644
--- a/sdrgui/dsp/scopevismulti.cpp
+++ b/sdrgui/dsp/scopevismulti.cpp
@@ -61,6 +61,9 @@ ScopeVisMulti::ScopeVisMulti(GLScopeMulti* glScope) :
 {
     setObjectName("ScopeVisNG");
     m_glScope->setTraces(&m_traces.m_tracesData, &m_traces.m_traces[0]);
+    for (int i = 0; i < (int) nbProjectionTypes; i++) {
+        m_projectorCache[i] = 0.0;
+    }
 }
 
 ScopeVisMulti::~ScopeVisMulti()
diff --git a/sdrgui/dsp/scopevisng.cpp b/sdrgui/dsp/scopevisng.cpp
index b34a7de2a..19195f4d6 100644
--- a/sdrgui/dsp/scopevisng.cpp
+++ b/sdrgui/dsp/scopevisng.cpp
@@ -64,6 +64,9 @@ ScopeVisNG::ScopeVisNG(GLScopeNG* glScope) :
     setObjectName("ScopeVisNG");
     m_traceDiscreteMemory.resize(m_traceChunkSize); // arbitrary
     m_glScope->setTraces(&m_traces.m_tracesData, &m_traces.m_traces[0]);
+    for (int i = 0; i < (int) nbProjectionTypes; i++) {
+        m_projectorCache[i] = 0.0;
+    }
 }
 
 ScopeVisNG::~ScopeVisNG()
diff --git a/sdrgui/gui/glscope.cpp b/sdrgui/gui/glscope.cpp
index 9a7b812e6..29db0558a 100644
--- a/sdrgui/gui/glscope.cpp
+++ b/sdrgui/gui/glscope.cpp
@@ -86,6 +86,7 @@ GLScope::GLScope(QWidget* parent) :
 	m_x2Scale.setOrientation(Qt::Horizontal);
 	m_powerOverlayFont.setBold(true);
 	m_powerOverlayFont.setPointSize(font().pointSize()+1);
+	memset(m_sampleRates, 0, (1<<m_memHistorySizeLog2)*sizeof(int));
 }
 
 GLScope::~GLScope()
diff --git a/sdrgui/gui/glspectrum.cpp b/sdrgui/gui/glspectrum.cpp
index 84e924878..642ba9329 100644
--- a/sdrgui/gui/glspectrum.cpp
+++ b/sdrgui/gui/glspectrum.cpp
@@ -1279,10 +1279,12 @@ void GLSpectrum::applyChanges()
 
 		if (sidebands == ChannelMarker::usb) {
 			nw = dv->m_channelMarker->getLowCutoff();     // negative bandwidth
-			pw = (dv->m_channelMarker->getBandwidth() / 2); // positive bandwidth
+			int bw = dv->m_channelMarker->getBandwidth() / 2;
+			pw = (qreal) bw; // positive bandwidth
 		} else if (sidebands == ChannelMarker::lsb) {
 			pw = dv->m_channelMarker->getLowCutoff();
-			nw = (dv->m_channelMarker->getBandwidth() / 2);
+			int bw = dv->m_channelMarker->getBandwidth() / 2;
+			nw = (qreal) bw;
 		} else if (sidebands == ChannelMarker::vusb) {
             nw = -dv->m_channelMarker->getOppositeBandwidth(); // negative bandwidth
             pw = dv->m_channelMarker->getBandwidth(); // positive bandwidth