diff --git a/fcdlib/fcdtraits.cpp b/fcdlib/fcdtraits.cpp
index 40592dd80..ac008da78 100644
--- a/fcdlib/fcdtraits.cpp
+++ b/fcdlib/fcdtraits.cpp
@@ -34,7 +34,7 @@ const char *fcd_traits<ProPlus>::displayedName = "FunCube Dongle Pro+";
 const char *fcd_traits<Pro>::pluginDisplayedName = "FunCube Pro Input";
 const char *fcd_traits<ProPlus>::pluginDisplayedName = "FunCube Pro+ Input";
 
-const char *fcd_traits<Pro>::pluginVersion = "4.0.0";
+const char *fcd_traits<Pro>::pluginVersion = "4.3.0";
 const char *fcd_traits<ProPlus>::pluginVersion = "4.3.0";
 
 const int64_t fcd_traits<Pro>::loLowLimitFreq = 64000000L;
diff --git a/plugins/samplesource/fcdpro/fcdprogui.ui b/plugins/samplesource/fcdpro/fcdprogui.ui
index 5e3d747d7..ad9e7c918 100644
--- a/plugins/samplesource/fcdpro/fcdprogui.ui
+++ b/plugins/samplesource/fcdpro/fcdprogui.ui
@@ -31,9 +31,6 @@
   <property name="windowTitle">
    <string>FunCubeDongle</string>
   </property>
-  <property name="toolTip">
-   <string>start/stop acquisition</string>
-  </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <property name="spacing">
     <number>3</number>
@@ -61,6 +58,9 @@
         <layout class="QHBoxLayout" name="deviceButtonsLayout">
          <item>
           <widget class="ButtonSwitch" name="startStop">
+           <property name="toolTip">
+            <string>start/stop acquisition</string>
+           </property>
            <property name="text">
             <string/>
            </property>
@@ -287,7 +287,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="lnaEnhance"/>
+      <widget class="QComboBox" name="lnaEnhance">
+       <property name="toolTip">
+        <string>LNA enhancement</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="bandLabel">
@@ -297,7 +301,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="band"/>
+      <widget class="QComboBox" name="band">
+       <property name="toolTip">
+        <string>Band optimizations</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -311,7 +319,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="bias"/>
+      <widget class="QComboBox" name="bias">
+       <property name="toolTip">
+        <string>Band bias</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="label_2">
@@ -321,7 +333,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="mode"/>
+      <widget class="QComboBox" name="mode">
+       <property name="toolTip">
+        <string>Mode ?</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -335,7 +351,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="lnaGain"/>
+      <widget class="QComboBox" name="lnaGain">
+       <property name="toolTip">
+        <string>LNA gain</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="rfFilterLabel">
@@ -345,7 +365,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="rfFilter"/>
+      <widget class="QComboBox" name="rfFilter">
+       <property name="toolTip">
+        <string>RF filter selection</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -359,7 +383,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="mixGain"/>
+      <widget class="QComboBox" name="mixGain">
+       <property name="toolTip">
+        <string>Mixer gain</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="mixFilterLabel">
@@ -369,7 +397,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="mixFilter"/>
+      <widget class="QComboBox" name="mixFilter">
+       <property name="toolTip">
+        <string>Mixer filter selection</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -383,7 +415,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="gain1"/>
+      <widget class="QComboBox" name="gain1">
+       <property name="toolTip">
+        <string>Gain block #1</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="rcFilterLabel">
@@ -393,7 +429,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="rcFilter"/>
+      <widget class="QComboBox" name="rcFilter">
+       <property name="toolTip">
+        <string>Baseband RC filter selection</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -407,7 +447,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="gain2"/>
+      <widget class="QComboBox" name="gain2">
+       <property name="toolTip">
+        <string>Gain block #2</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="gain3Label">
@@ -417,7 +461,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="gain3"/>
+      <widget class="QComboBox" name="gain3">
+       <property name="toolTip">
+        <string>Gain block #3</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -431,7 +479,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="gain4"/>
+      <widget class="QComboBox" name="gain4">
+       <property name="toolTip">
+        <string>Gain block #4</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="label_3">
@@ -441,7 +493,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="ifFilter"/>
+      <widget class="QComboBox" name="ifFilter">
+       <property name="toolTip">
+        <string>IF filter selection</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
@@ -455,7 +511,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="gain5"/>
+      <widget class="QComboBox" name="gain5">
+       <property name="toolTip">
+        <string>Gain block #5</string>
+       </property>
+      </widget>
      </item>
      <item>
       <widget class="QLabel" name="gain6Label">
@@ -465,7 +525,11 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="gain6"/>
+      <widget class="QComboBox" name="gain6">
+       <property name="toolTip">
+        <string>Gain block #6</string>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
diff --git a/plugins/samplesource/fcdpro/fcdproinput.cpp b/plugins/samplesource/fcdpro/fcdproinput.cpp
index 03f1ec662..2ba8b52c0 100644
--- a/plugins/samplesource/fcdpro/fcdproinput.cpp
+++ b/plugins/samplesource/fcdpro/fcdproinput.cpp
@@ -1,6 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
-// written by Christian Daniel                                                   //
+// Copyright (C) 2015-2018 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          //
@@ -15,8 +14,6 @@
 // along with this program. If not, see <http://www.gnu.org/licenses/>.          //
 ///////////////////////////////////////////////////////////////////////////////////
 
-// FIXME: FCD is handled very badly!
-
 #include <QDebug>
 #include <string.h>
 #include <errno.h>
@@ -27,10 +24,9 @@
 #include "dsp/dspcommands.h"
 #include "dsp/dspengine.h"
 #include "dsp/filerecord.h"
+#include "device/devicesourceapi.h"
+
 #include "fcdproinput.h"
-
-#include <device/devicesourceapi.h>
-
 #include "fcdprothread.h"
 #include "fcdtraits.h"
 #include "fcdproconst.h"
@@ -47,6 +43,7 @@ FCDProInput::FCDProInput(DeviceSourceAPI *deviceAPI) :
 	m_deviceDescription(fcd_traits<Pro>::displayedName),
 	m_running(false)
 {
+    m_fcdFIFO.setSize(20*fcd_traits<Pro>::convBufSize);
     openDevice();
     m_fileSink = new FileRecord(QString("test_%1.sdriq").arg(m_deviceAPI->getDeviceUID()));
     m_deviceAPI->addSink(m_fileSink);
@@ -54,9 +51,13 @@ FCDProInput::FCDProInput(DeviceSourceAPI *deviceAPI) :
 
 FCDProInput::~FCDProInput()
 {
-    if (m_running) stop();
+    if (m_running) {
+        stop();
+    }
+
     m_deviceAPI->removeSink(m_fileSink);
     delete m_fileSink;
+
     closeDevice();
 }
 
@@ -67,15 +68,12 @@ void FCDProInput::destroy()
 
 bool FCDProInput::openDevice()
 {
-    int device = m_deviceAPI->getSampleSourceSequence();
-
-    if (m_dev != 0)
-    {
+    if (m_dev != 0) {
         closeDevice();
     }
 
+    int device = m_deviceAPI->getSampleSourceSequence();
     qDebug() << "FCDProInput::openDevice with device #" << device;
-
     m_dev = fcdOpen(fcd_traits<Pro>::vendorId, fcd_traits<Pro>::productId, device);
 
     if (m_dev == 0)
@@ -117,7 +115,17 @@ bool FCDProInput::start()
 		return false;
 	}
 
-	m_FCDThread = new FCDProThread(&m_sampleFifo);
+    if (!openFCDAudio(fcd_traits<Pro>::qtDeviceName))
+    {
+        qCritical("FCDProInput::start: could not open FCD audio source");
+        return false;
+    }
+    else
+    {
+        qDebug("FCDProInput::start: FCD audio source opened");
+    }
+
+	m_FCDThread = new FCDProThread(&m_sampleFifo, &m_fcdFIFO);
 	m_FCDThread->startWork();
 
 //	mutexLocker.unlock();
@@ -139,6 +147,35 @@ void FCDProInput::closeDevice()
     m_dev = 0;
 }
 
+bool FCDProInput::openFCDAudio(const char* cardname)
+{
+    AudioDeviceManager *audioDeviceManager = DSPEngine::instance()->getAudioDeviceManager();
+    const QList<QAudioDeviceInfo>& audioList = audioDeviceManager->getInputDevices();
+
+    for (const auto &itAudio : audioList)
+    {
+        if (itAudio.deviceName().contains(QString(cardname)))
+        {
+            int fcdDeviceIndex = audioDeviceManager->getInputDeviceIndex(itAudio.deviceName());
+            m_fcdAudioInput.start(fcdDeviceIndex, fcd_traits<Pro>::sampleRate);
+            int fcdSampleRate = m_fcdAudioInput.getRate();
+            qDebug("FCDProPlusInput::openFCDAudio: %s index %d at %d S/s",
+                    itAudio.deviceName().toStdString().c_str(), fcdDeviceIndex, fcdSampleRate);
+            m_fcdAudioInput.addFifo(&m_fcdFIFO);
+            return true;
+        }
+    }
+
+    qCritical("FCDProInput::openFCDAudio: device with name %s not found", cardname);
+    return false;
+}
+
+void FCDProInput::closeFCDAudio()
+{
+    m_fcdAudioInput.removeFifo(&m_fcdFIFO);
+    m_fcdAudioInput.stop();
+}
+
 void FCDProInput::stop()
 {
 //	QMutexLocker mutexLocker(&m_mutex);
@@ -148,7 +185,8 @@ void FCDProInput::stop()
 		m_FCDThread->stopWork();
 		// wait for thread to quit ?
 		delete m_FCDThread;
-		m_FCDThread = 0;
+		m_FCDThread = nullptr;
+		closeFCDAudio();
 	}
 
 	m_running = false;
diff --git a/plugins/samplesource/fcdpro/fcdproinput.h b/plugins/samplesource/fcdpro/fcdproinput.h
index dfdbabe0d..aa0c7240f 100644
--- a/plugins/samplesource/fcdpro/fcdproinput.h
+++ b/plugins/samplesource/fcdpro/fcdproinput.h
@@ -1,6 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
-// written by Christian Daniel                                                   //
+// Copyright (C) 2015-2018 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          //
@@ -22,7 +21,10 @@
 #include <QByteArray>
 #include <inttypes.h>
 
-#include <dsp/devicesamplesource.h>
+#include "dsp/devicesamplesource.h"
+#include "audio/audioinput.h"
+#include "audio/audiofifo.h"
+
 #include "fcdprosettings.h"
 #include "fcdhid.h"
 
@@ -158,6 +160,8 @@ public:
 private:
     bool openDevice();
     void closeDevice();
+    bool openFCDAudio(const char *filename);
+    void closeFCDAudio();
 	void applySettings(const FCDProSettings& settings, bool force);
 	void set_lo_ppm();
 
@@ -165,6 +169,8 @@ private:
 
 	DeviceSourceAPI *m_deviceAPI;
 	hid_device *m_dev;
+    AudioInput m_fcdAudioInput;
+    AudioFifo m_fcdFIFO;
 	QMutex m_mutex;
 	FCDProSettings m_settings;
 	FCDProThread* m_FCDThread;
diff --git a/plugins/samplesource/fcdpro/fcdprothread.cpp b/plugins/samplesource/fcdpro/fcdprothread.cpp
index e1fbbb721..7b4152b2e 100644
--- a/plugins/samplesource/fcdpro/fcdprothread.cpp
+++ b/plugins/samplesource/fcdpro/fcdprothread.cpp
@@ -18,16 +18,19 @@
 #include <QDebug>
 #include <stdio.h>
 #include <errno.h>
-#include "fcdprothread.h"
+#include <chrono>
+#include <thread>
 
 #include "dsp/samplesinkfifo.h"
-#include "fcdtraits.h"
+#include "audio/audiofifo.h"
 
-FCDProThread::FCDProThread(SampleSinkFifo* sampleFifo, QObject* parent) :
+#include "fcdprothread.h"
+
+FCDProThread::FCDProThread(SampleSinkFifo* sampleFifo, AudioFifo *fcdFIFO, QObject* parent) :
 	QThread(parent),
-	fcd_handle(NULL),
+	m_fcdFIFO(fcdFIFO),
 	m_running(false),
-	m_convertBuffer(fcd_traits<Pro>::convBufSize),
+	m_convertBuffer(fcd_traits<Pro>::convBufSize), // nb samples
 	m_sampleFifo(sampleFifo)
 {
 	start();
@@ -59,107 +62,23 @@ void FCDProThread::stopWork()
 
 void FCDProThread::run()
 {
-	if ( !OpenSource(fcd_traits<Pro>::alsaDeviceName) )
-	{
-		qCritical() << "FCDThread::run: cannot open FCD sound card";
-		return;
-	}
-	// TODO: fallback to original fcd
+    m_running = true;
+    qDebug("FCDProThread::run: start running loop");
 
-	m_running = true;
+    while (m_running)
+    {
+        work(fcd_traits<Pro>::convBufSize);
+        std::this_thread::sleep_for(std::chrono::microseconds(200));
+    }
 
-	while(m_running)
-	{
-		if (work(fcd_traits<Pro>::convBufSize) < 0)
-		{
-			break;
-		}
-	}
-
-	CloseSource();
+    qDebug("FCDProThread::run: running loop stopped");
+    m_running = false;
 }
 
-bool FCDProThread::OpenSource(const char* cardname)
+void FCDProThread::work(unsigned int n_items)
 {
-	bool fail = false;
-	snd_pcm_hw_params_t* params;
-	//fcd_rate = FCDPP_RATE;
-	//fcd_channels =2;
-	//fcd_format = SND_PCM_SFMT_U16_LE;
-	snd_pcm_stream_t fcd_stream = SND_PCM_STREAM_CAPTURE;
-
-	if (fcd_handle)
-	{
-		return false;
-	}
-
-	if (snd_pcm_open(&fcd_handle, cardname, fcd_stream, 0) < 0)
-	{
-		qCritical("FCDThread::OpenSource: cannot open %s", cardname);
-		return false;
-	}
-
-	snd_pcm_hw_params_alloca(&params);
-
-	if (snd_pcm_hw_params_any(fcd_handle, params) < 0)
-	{
-		qCritical("FCDThread::OpenSource: snd_pcm_hw_params_any failed");
-		fail = true;
-	}
-	else if (snd_pcm_hw_params(fcd_handle, params) < 0)
-	{
-		qCritical("FCDThread::OpenSource: snd_pcm_hw_params failed");
-		fail = true;
-		// TODO: check actual samplerate, may be crippled firmware
-	}
-	else
-	{
-		if (snd_pcm_start(fcd_handle) < 0)
-		{
-			qCritical("FCDThread::OpenSource: snd_pcm_start failed");
-			fail = true;
-		}
-	}
-
-	if (fail)
-	{
-		snd_pcm_close( fcd_handle );
-		return false;
-	}
-	else
-	{
-		qDebug("FCDThread::OpenSource: Funcube stream started");
-	}
-
-	return true;
+    uint32_t nbRead = m_fcdFIFO->read((unsigned char *) m_buf, n_items); // number of samples
+    SampleVector::iterator it = m_convertBuffer.begin();
+    m_decimators.decimate1(&it, m_buf, 2*nbRead);
+    m_sampleFifo->write(m_convertBuffer.begin(), it);
 }
-
-void FCDProThread::CloseSource()
-{
-	if (fcd_handle)
-	{
-		snd_pcm_close( fcd_handle );
-	}
-
-	fcd_handle = NULL;
-}
-
-int FCDProThread::work(int n_items)
-{
-	int l;
-	SampleVector::iterator it;
-	void *out;
-
-	it = m_convertBuffer.begin();
-	out = (void *)&it[0];
-	l = snd_pcm_mmap_readi(fcd_handle, out, (snd_pcm_uframes_t)n_items);
-	if (l > 0)
-		m_sampleFifo->write(it, it + l);
-	if (l == -EPIPE) {
-		qDebug("FCD: Overrun detected");
-		return 0;
-	}
-	return l;
-}
-
-
diff --git a/plugins/samplesource/fcdpro/fcdprothread.h b/plugins/samplesource/fcdpro/fcdprothread.h
index ce3e47da5..05891cd92 100644
--- a/plugins/samplesource/fcdpro/fcdprothread.h
+++ b/plugins/samplesource/fcdpro/fcdprothread.h
@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2015 Edouard Griffiths, F4EXB                                   //
+// Copyright (C) 2015-2018 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          //
@@ -20,33 +20,37 @@
 #include <QThread>
 #include <QMutex>
 #include <QWaitCondition>
-#include "dsp/inthalfbandfilter.h"
-#include <alsa/asoundlib.h>
+
 #include "dsp/samplesinkfifo.h"
+#include "dsp/decimators.h"
+#include "fcdtraits.h"
+
+class AudioFifo;
 
 class FCDProThread : public QThread {
 	Q_OBJECT
 
 public:
-	FCDProThread(SampleSinkFifo* sampleFifo, QObject* parent = NULL);
+	FCDProThread(SampleSinkFifo* sampleFifo, AudioFifo *fcdFIFO, QObject* parent = nullptr);
 	~FCDProThread();
 
 	void startWork();
 	void stopWork();
-	bool OpenSource(const char *filename);
-	void CloseSource();
 
 private:
-	snd_pcm_t* fcd_handle;
+	AudioFifo* m_fcdFIFO;
 
 	QMutex m_startWaitMutex;
 	QWaitCondition m_startWaiter;
 	bool m_running;
 
+    qint16 m_buf[fcd_traits<Pro>::convBufSize*2]; // stereo (I, Q)
 	SampleVector m_convertBuffer;
 	SampleSinkFifo* m_sampleFifo;
+	Decimators<qint32, qint16, SDR_RX_SAMP_SZ, 16> m_decimators;
 
 	void run();
-	int work(int n_items);
+	void work(unsigned int n_items);
 };
+
 #endif // INCLUDE_FCDPROTHREAD_H
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
index 30d77a5e8..4c9776e13 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.cpp
@@ -23,11 +23,10 @@
 
 #include "dsp/dspcommands.h"
 #include "dsp/dspengine.h"
-#include <dsp/filerecord.h>
+#include "dsp/filerecord.h"
+#include "device/devicesourceapi.h"
+
 #include "fcdproplusinput.h"
-
-#include <device/devicesourceapi.h>
-
 #include "fcdproplusthread.h"
 #include "fcdtraits.h"
 #include "fcdproplusconst.h"
@@ -39,7 +38,6 @@ MESSAGE_CLASS_DEFINITION(FCDProPlusInput::MsgFileRecord, Message)
 FCDProPlusInput::FCDProPlusInput(DeviceSourceAPI *deviceAPI) :
     m_deviceAPI(deviceAPI),
 	m_dev(0),
-	fcd_handle(0),
 	m_settings(),
 	m_FCDThread(0),
 	m_deviceDescription(fcd_traits<ProPlus>::displayedName),
@@ -53,9 +51,13 @@ FCDProPlusInput::FCDProPlusInput(DeviceSourceAPI *deviceAPI) :
 
 FCDProPlusInput::~FCDProPlusInput()
 {
-    if (m_running) stop();
+    if (m_running) {
+        stop();
+    }
+
     m_deviceAPI->removeSink(m_fileSink);
     delete m_fileSink;
+
     closeDevice();
 }
 
@@ -66,9 +68,12 @@ void FCDProPlusInput::destroy()
 
 bool FCDProPlusInput::openDevice()
 {
+    if (m_dev != 0) {
+        closeDevice();
+    }
+
     int device = m_deviceAPI->getSampleSourceSequence();
     qDebug() << "FCDProPlusInput::openDevice with device #" << device;
-
     m_dev = fcdOpen(fcd_traits<ProPlus>::vendorId, fcd_traits<ProPlus>::productId, device);
 
     if (m_dev == 0)
diff --git a/plugins/samplesource/fcdproplus/fcdproplusinput.h b/plugins/samplesource/fcdproplus/fcdproplusinput.h
index 99a139dff..94206cd61 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusinput.h
+++ b/plugins/samplesource/fcdproplus/fcdproplusinput.h
@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2016 Edouard Griffiths, F4EXB                                   //
+// Copyright (C) 2016-2018 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          //
@@ -21,8 +21,6 @@
 #include <QByteArray>
 #include <inttypes.h>
 
-#include <alsa/asoundlib.h>
-
 #include "dsp/devicesamplesource.h"
 #include "audio/audioinput.h"
 #include "audio/audiofifo.h"
@@ -161,7 +159,6 @@ private:
 	hid_device *m_dev;
 	AudioInput m_fcdAudioInput;
 	AudioFifo m_fcdFIFO;
-	snd_pcm_t* fcd_handle;
 	QMutex m_mutex;
 	FCDProPlusSettings m_settings;
 	FCDProPlusThread* m_FCDThread;
diff --git a/plugins/samplesource/fcdproplus/fcdproplusthread.cpp b/plugins/samplesource/fcdproplus/fcdproplusthread.cpp
index 0f742bde7..4a6f27f2a 100644
--- a/plugins/samplesource/fcdproplus/fcdproplusthread.cpp
+++ b/plugins/samplesource/fcdproplus/fcdproplusthread.cpp
@@ -17,11 +17,14 @@
 #include <QDebug>
 #include <stdio.h>
 #include <errno.h>
-#include "fcdproplusthread.h"
+#include <chrono>
+#include <thread>
 
 #include "dsp/samplesinkfifo.h"
 #include "audio/audiofifo.h"
 
+#include "fcdproplusthread.h"
+
 FCDProPlusThread::FCDProPlusThread(SampleSinkFifo* sampleFifo, AudioFifo *fcdFIFO, QObject* parent) :
 	QThread(parent),
 	m_fcdFIFO(fcdFIFO),
@@ -61,8 +64,10 @@ void FCDProPlusThread::run()
 	m_running = true;
 	qDebug("FCDThread::run: start running loop");
 
-	while (m_running) {
+	while (m_running)
+	{
 	    work(fcd_traits<ProPlus>::convBufSize);
+	    std::this_thread::sleep_for(std::chrono::microseconds(100));
 	}
 
 	qDebug("FCDThread::run: running loop stopped");