diff --git a/plugins/channelrx/demodais/aisdemodgui.cpp b/plugins/channelrx/demodais/aisdemodgui.cpp
index 3418055df..8b439eb8c 100644
--- a/plugins/channelrx/demodais/aisdemodgui.cpp
+++ b/plugins/channelrx/demodais/aisdemodgui.cpp
@@ -433,7 +433,7 @@ AISDemodGUI::AISDemodGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, Baseban
     traceDataQ.m_ampIndex = 0;
     traceDataQ.m_ofs = 0.0;
     traceDataQ.m_ofsCoarse = 0;
-    ui->scopeGUI->addTrace(traceDataI);
+    ui->scopeGUI->changeTrace(0, traceDataI);
     ui->scopeGUI->addTrace(traceDataQ);
     ui->scopeGUI->setDisplayMode(GLScopeSettings::DisplayXYV);
     ui->scopeGUI->focusOnTrace(0); // re-focus to take changes into account in the GUI
@@ -442,7 +442,7 @@ AISDemodGUI::AISDemodGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, Baseban
     triggerData.m_triggerLevel = 0.1;
     triggerData.m_triggerLevelCoarse = 10;
     triggerData.m_triggerPositiveEdge = true;
-    ui->scopeGUI->addTrigger(triggerData);
+    ui->scopeGUI->changeTrigger(0, triggerData);
     ui->scopeGUI->focusOnTrigger(0); // re-focus to take changes into account in the GUI
 
     m_scopeVis->setLiveRate(9600*6);
diff --git a/sdrgui/gui/glscopegui.h b/sdrgui/gui/glscopegui.h
index 05b378018..db7550bb9 100644
--- a/sdrgui/gui/glscopegui.h
+++ b/sdrgui/gui/glscopegui.h
@@ -51,6 +51,8 @@ public:
     virtual bool deserialize(const QByteArray& data);
 
     bool handleMessage(Message* message);
+    unsigned int getNbTraces() const { return m_settings.m_tracesData.size(); }
+    unsigned int getNbTriggers() const { return m_settings.m_triggersData.size(); }
 
     // preconfiguration methods
     // global (first line):