diff --git a/plugins/channelrx/demodam/amdemod.cpp b/plugins/channelrx/demodam/amdemod.cpp
index 4ec996a92..5f3bf9eed 100644
--- a/plugins/channelrx/demodam/amdemod.cpp
+++ b/plugins/channelrx/demodam/amdemod.cpp
@@ -78,7 +78,6 @@ AMDemod::AMDemod(DeviceAPI *deviceAPI) :
         this,
         &AMDemod::handleIndexInDeviceSetChanged
     );
-    start();
 }
 
 AMDemod::~AMDemod()
diff --git a/plugins/channelrx/demodnfm/nfmdemod.cpp b/plugins/channelrx/demodnfm/nfmdemod.cpp
index ab475ee79..078d25f43 100644
--- a/plugins/channelrx/demodnfm/nfmdemod.cpp
+++ b/plugins/channelrx/demodnfm/nfmdemod.cpp
@@ -78,8 +78,6 @@ NFMDemod::NFMDemod(DeviceAPI *devieAPI) :
         this,
         &NFMDemod::handleIndexInDeviceSetChanged
     );
-
-    start();
 }
 
 NFMDemod::~NFMDemod()
@@ -593,11 +591,11 @@ void NFMDemod::webapiFormatChannelReport(SWGSDRangel::SWGChannelReport& response
     getMagSqLevels(magsqAvg, magsqPeak, nbMagsqSamples);
 
     response.getNfmDemodReport()->setChannelPowerDb(CalcDb::dbPower(magsqAvg));
-    int nbCtcssToneFrequencies;
 
     if (m_running)
     {
-        const Real *ctcssToneFrequencies = m_basebandSink->getCtcssToneSet(nbCtcssToneFrequencies);
+        int nbCtcssToneFrequencies = CTCSSDetector::getNTones();
+        const Real *ctcssToneFrequencies = CTCSSDetector::getToneSet();
         response.getNfmDemodReport()->setCtcssTone(
             m_settings.m_ctcssOn ?
                 m_settings.m_ctcssIndex < 0 ?
diff --git a/plugins/channelrx/demodnfm/nfmdemod.h b/plugins/channelrx/demodnfm/nfmdemod.h
index 14ca52d10..8d1504795 100644
--- a/plugins/channelrx/demodnfm/nfmdemod.h
+++ b/plugins/channelrx/demodnfm/nfmdemod.h
@@ -124,7 +124,6 @@ public:
             const QStringList& channelSettingsKeys,
             SWGSDRangel::SWGChannelSettings& response);
 
-	const Real *getCtcssToneSet(int& nbTones) const { return m_running ? m_basebandSink->getCtcssToneSet(nbTones) : nullptr; }
 	bool getSquelchOpen() const { return m_running && m_basebandSink->getSquelchOpen(); }
 
     void getMagSqLevels(double& avg, double& peak, int& nbSamples)
diff --git a/plugins/channelrx/demodnfm/nfmdemodbaseband.h b/plugins/channelrx/demodnfm/nfmdemodbaseband.h
index 257639257..9e5505ee8 100644
--- a/plugins/channelrx/demodnfm/nfmdemodbaseband.h
+++ b/plugins/channelrx/demodnfm/nfmdemodbaseband.h
@@ -66,7 +66,6 @@ public:
     int getChannelSampleRate() const;
     void getMagSqLevels(double& avg, double& peak, int& nbSamples) { m_sink.getMagSqLevels(avg, peak, nbSamples); }
     bool getSquelchOpen() const { return m_sink.getSquelchOpen(); }
-    const Real *getCtcssToneSet(int& nbTones) const { return m_sink.getCtcssToneSet(nbTones); }
     void setMessageQueueToGUI(MessageQueue *messageQueue) { m_sink.setMessageQueueToGUI(messageQueue); }
     int getAudioSampleRate() const { return m_sink.getAudioSampleRate(); }
     void setBasebandSampleRate(int sampleRate);
diff --git a/plugins/channelrx/demodnfm/nfmdemodgui.cpp b/plugins/channelrx/demodnfm/nfmdemodgui.cpp
index f581cdbbc..2a09aa779 100644
--- a/plugins/channelrx/demodnfm/nfmdemodgui.cpp
+++ b/plugins/channelrx/demodnfm/nfmdemodgui.cpp
@@ -407,13 +407,16 @@ NFMDemodGUI::NFMDemodGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, Baseban
 
     ui->channelSpacing->setCurrentIndex(NFMDemodSettings::getChannelSpacingIndex(12500));
 
-    int ctcss_nbTones;
-    const Real *ctcss_tones = m_nfmDemod->getCtcssToneSet(ctcss_nbTones);
+    int ctcss_nbTones = CTCSSDetector::getNTones();
+    const Real *ctcss_tones = CTCSSDetector::getToneSet();
 
     ui->ctcss->addItem("--");
 
-    for (int i=0; i<ctcss_nbTones; i++) {
-        ui->ctcss->addItem(QString("%1").arg(ctcss_tones[i]));
+    if (ctcss_tones)
+    {
+        for (int i=0; i<ctcss_nbTones; i++) {
+            ui->ctcss->addItem(QString("%1").arg(ctcss_tones[i]));
+        }
     }
 
     ui->dcsOn->setChecked(m_settings.m_dcsOn);
diff --git a/plugins/channelrx/demodnfm/nfmdemodsink.h b/plugins/channelrx/demodnfm/nfmdemodsink.h
index 04b9225d1..5a1ae19ee 100644
--- a/plugins/channelrx/demodnfm/nfmdemodsink.h
+++ b/plugins/channelrx/demodnfm/nfmdemodsink.h
@@ -45,11 +45,6 @@ public:
 
     virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
 
-    const Real *getCtcssToneSet(int& nbTones) const {
-        nbTones = m_ctcssDetector.getNTones();
-        return m_ctcssDetector.getToneSet();
-    }
-
     bool getSquelchOpen() const { return m_squelchOpen; }
 
     void getMagSqLevels(double& avg, double& peak, int& nbSamples)
diff --git a/plugins/channelrx/demodssb/ssbdemod.cpp b/plugins/channelrx/demodssb/ssbdemod.cpp
index 9306b65fc..2a5b445b2 100644
--- a/plugins/channelrx/demodssb/ssbdemod.cpp
+++ b/plugins/channelrx/demodssb/ssbdemod.cpp
@@ -54,6 +54,8 @@ const char* const SSBDemod::m_channelId = "SSBDemod";
 SSBDemod::SSBDemod(DeviceAPI *deviceAPI) :
         ChannelAPI(m_channelIdURI, ChannelAPI::StreamSingleSink),
         m_deviceAPI(deviceAPI),
+        m_thread(nullptr),
+        m_basebandSink(nullptr),
         m_running(false),
         m_spectrumVis(SDR_RX_SCALEF),
         m_basebandSampleRate(0)
@@ -78,8 +80,6 @@ SSBDemod::SSBDemod(DeviceAPI *deviceAPI) :
         this,
         &SSBDemod::handleIndexInDeviceSetChanged
     );
-
-    start();
 }
 
 SSBDemod::~SSBDemod()
diff --git a/plugins/channelrx/demodssb/ssbdemodgui.cpp b/plugins/channelrx/demodssb/ssbdemodgui.cpp
index ea969e5e1..a1df51f06 100644
--- a/plugins/channelrx/demodssb/ssbdemodgui.cpp
+++ b/plugins/channelrx/demodssb/ssbdemodgui.cpp
@@ -202,6 +202,7 @@ void SSBDemodGUI::on_agc_toggled(bool checked)
 {
     m_settings.m_agc = checked;
     applySettings();
+    displayAGC();
 }
 
 void SSBDemodGUI::on_agcClamping_toggled(bool checked)
@@ -440,6 +441,8 @@ SSBDemodGUI::SSBDemodGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, Baseban
 	displaySettings();
     makeUIConnections();
 
+    qDebug() << "********************" << m_settings.m_filterBank.size() << m_settings.m_filterIndex;
+    qDebug() << "*********** " << m_settings.m_filterBank[m_settings.m_filterIndex].m_spanLog2;
 	applyBandwidths(m_settings.m_filterBank[m_settings.m_filterIndex].m_spanLog2, true); // does applySettings(true)
     DialPopup::addPopupsToChildDials(this);
     m_resizer.enableChildMouseTracking();
@@ -466,10 +469,21 @@ void SSBDemodGUI::applySettings(bool force)
 	}
 }
 
+uint32_t SSBDemodGUI::getValidAudioSampleRate() const
+{
+    // When not running, m_ssbDemod->getAudioSampleRate() will return 0, but we
+    // want a valid value to initialise the GUI
+    int sr = m_ssbDemod->getAudioSampleRate();
+    if (sr == 0) {
+        sr = 48000;
+    }
+    return sr;
+}
+
 unsigned int SSBDemodGUI::spanLog2Max()
 {
     unsigned int spanLog2 = 0;
-    for (; m_ssbDemod->getAudioSampleRate() / (1<<spanLog2) >= 1000; spanLog2++);
+    for (; getValidAudioSampleRate() / (1<<spanLog2) >= 1000; spanLog2++);
     return spanLog2 == 0 ? 0 : spanLog2-1;
 }
 
@@ -481,10 +495,10 @@ void SSBDemodGUI::applyBandwidths(unsigned int spanLog2, bool force)
     ui->spanLog2->setMaximum(limit);
     bool dsb = ui->dsb->isChecked();
     //int spanLog2 = ui->spanLog2->value();
-    m_spectrumRate = m_ssbDemod->getAudioSampleRate() / (1<<spanLog2);
+    m_spectrumRate = getValidAudioSampleRate() / (1<<spanLog2);
     int bw = ui->BW->value();
     int lw = ui->lowCut->value();
-    int bwMax = m_ssbDemod->getAudioSampleRate() / (100*(1<<spanLog2));
+    int bwMax = getValidAudioSampleRate() / (100*(1<<spanLog2));
     int tickInterval = m_spectrumRate / 1200;
     tickInterval = tickInterval == 0 ? 1 : tickInterval;
 
@@ -636,6 +650,7 @@ void SSBDemodGUI::displaySettings()
     ui->deltaFrequency->setValue(m_channelMarker.getCenterFrequency());
 
     ui->agc->setChecked(m_settings.m_agc);
+    displayAGC();
     ui->agcClamping->setChecked(m_settings.m_agcClamping);
     ui->dnr->setChecked(m_settings.m_dnr);
     ui->audioBinaural->setChecked(m_settings.m_audioBinaural);
@@ -694,6 +709,18 @@ void SSBDemodGUI::displaySettings()
     blockApplySettings(false);
 }
 
+void SSBDemodGUI::displayAGC()
+{
+    // Disable controls only valid when AGC is enabled
+    ui->agcClamping->setEnabled(m_settings.m_agc);
+    ui->agcTimeLog2->setEnabled(m_settings.m_agc);
+    ui->agcTimeText->setEnabled(m_settings.m_agc);
+    ui->agcPowerThreshold->setEnabled(m_settings.m_agc);
+    ui->agcPowerThresholdText->setEnabled(m_settings.m_agc);
+    ui->agcThresholdGate->setEnabled(m_settings.m_agc);
+    ui->agcThresholdGateText->setEnabled(m_settings.m_agc);
+}
+
 void SSBDemodGUI::displayAGCPowerThreshold(int value)
 {
     if (value == SSBDemodSettings::m_minPowerThresholdDB)
diff --git a/plugins/channelrx/demodssb/ssbdemodgui.h b/plugins/channelrx/demodssb/ssbdemodgui.h
index d4eeaae51..9fa2a9ae7 100644
--- a/plugins/channelrx/demodssb/ssbdemodgui.h
+++ b/plugins/channelrx/demodssb/ssbdemodgui.h
@@ -102,11 +102,13 @@ private:
 	void applyBandwidths(unsigned int spanLog2, bool force = false);
     unsigned int spanLog2Max();
 	void displaySettings();
+	void displayAGC();
 	void displayAGCPowerThreshold(int value);
     void displayAGCThresholdGate(int value);
 	bool handleMessage(const Message& message);
     void makeUIConnections();
     void updateAbsoluteCenterFrequency();
+	uint32_t getValidAudioSampleRate() const;
 
 	void leaveEvent(QEvent*);
 	void enterEvent(EnterEventType*);
diff --git a/plugins/channelrx/demodssb/ssbdemodgui.ui b/plugins/channelrx/demodssb/ssbdemodgui.ui
index 75b58f549..c37d0ded0 100644
--- a/plugins/channelrx/demodssb/ssbdemodgui.ui
+++ b/plugins/channelrx/demodssb/ssbdemodgui.ui
@@ -881,6 +881,13 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="Line" name="line_7">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="QDial" name="agcTimeLog2">
         <property name="maximumSize">
@@ -925,6 +932,13 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="Line" name="line_5">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="QDial" name="agcPowerThreshold">
         <property name="maximumSize">
@@ -969,6 +983,13 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="Line" name="line_6">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="QDial" name="agcThresholdGate">
         <property name="maximumSize">
@@ -1126,12 +1147,24 @@
    <extends>QToolButton</extends>
    <header>gui/buttonswitch.h</header>
   </customwidget>
+  <customwidget>
+   <class>ValueDialZ</class>
+   <extends>QWidget</extends>
+   <header>gui/valuedialz.h</header>
+   <container>1</container>
+  </customwidget>
   <customwidget>
    <class>RollupContents</class>
    <extends>QWidget</extends>
    <header>gui/rollupcontents.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>LevelMeterSignalDB</class>
+   <extends>QWidget</extends>
+   <header>gui/levelmeter.h</header>
+   <container>1</container>
+  </customwidget>
   <customwidget>
    <class>GLSpectrum</class>
    <extends>QWidget</extends>
@@ -1144,18 +1177,6 @@
    <header>gui/glspectrumgui.h</header>
    <container>1</container>
   </customwidget>
-  <customwidget>
-   <class>ValueDialZ</class>
-   <extends>QWidget</extends>
-   <header>gui/valuedialz.h</header>
-   <container>1</container>
-  </customwidget>
-  <customwidget>
-   <class>LevelMeterSignalDB</class>
-   <extends>QWidget</extends>
-   <header>gui/levelmeter.h</header>
-   <container>1</container>
-  </customwidget>
   <customwidget>
    <class>TickedSlider</class>
    <extends>QSlider</extends>
diff --git a/plugins/channelrx/demodvor/vordemod.cpp b/plugins/channelrx/demodvor/vordemod.cpp
index 06f830abd..769dcc41f 100644
--- a/plugins/channelrx/demodvor/vordemod.cpp
+++ b/plugins/channelrx/demodvor/vordemod.cpp
@@ -78,8 +78,6 @@ VORDemod::VORDemod(DeviceAPI *deviceAPI) :
         this,
         &VORDemod::handleIndexInDeviceSetChanged
     );
-
-    start();
 }
 
 VORDemod::~VORDemod()
diff --git a/plugins/channelrx/demodwfm/wfmdemod.cpp b/plugins/channelrx/demodwfm/wfmdemod.cpp
index 0254195ba..a92a104d2 100644
--- a/plugins/channelrx/demodwfm/wfmdemod.cpp
+++ b/plugins/channelrx/demodwfm/wfmdemod.cpp
@@ -79,7 +79,6 @@ WFMDemod::WFMDemod(DeviceAPI* deviceAPI) :
         this,
         &WFMDemod::handleIndexInDeviceSetChanged
     );
-    start();
 }
 
 WFMDemod::~WFMDemod()
diff --git a/sdrbase/dsp/ctcssdetector.h b/sdrbase/dsp/ctcssdetector.h
index e8ec835d0..d2304c0bf 100644
--- a/sdrbase/dsp/ctcssdetector.h
+++ b/sdrbase/dsp/ctcssdetector.h
@@ -46,12 +46,12 @@ public:
     bool analyze(Real *sample); // input signal sample
 
     // get the number of defined tones.
-    int getNTones() const {
+    static int getNTones() {
     	return CTCSSFrequencies::m_nbFreqs;
     }
 
     // get the tone set
-    const Real *getToneSet() const {
+    static const Real *getToneSet() {
     	return CTCSSFrequencies::m_Freqs;
     }