fix ClearUp and add Kill() override to JackPlugin

SpiralSound/Plugins/JackPlugin/JackPlugin.C

@@ -450,9 +450,27 @@ m_Connected(false)
 
 JackPlugin::~JackPlugin()
 {
+	if (m_JackClient)
+	{
+		m_JackClient->Detach();
+		delete m_JackClient; 
+		m_JackClient=NULL;
+	}	
+}
+
+bool JackPlugin::Kill()
+{
+	m_IsDead=true;
+
+	UpdatePluginInfoWithHost();
+	RemoveAllInputs ();
+	RemoveAllOutputs ();
+	UpdatePluginInfoWithHost();
+
 	m_JackClient->Detach();
 	delete m_JackClient; 
 	m_JackClient=NULL;
+	return true;
 }
 
 PluginInfo &JackPlugin::Initialise(const HostInfo *Host)
@@ -519,6 +537,8 @@ void JackPlugin::Execute()
 
 void JackPlugin::ExecuteCommands()
 {
+	if (m_IsDead) return;
+	
         bool commandwaiting = m_AudioCH->IsCommandWaiting();
         int command = (commandwaiting)?(int)m_AudioCH->GetCommand():0;
 

SpiralSound/Plugins/JackPlugin/JackPlugin.h

@@ -126,6 +126,8 @@ public:
 	
 	virtual void 		Execute();
 	virtual void 		ExecuteCommands();
+
+	virtual bool         	Kill();
 	
 	virtual void	    StreamOut(std::ostream &s);
 	virtual void	    StreamIn(std::istream &s);

SpiralSynthModular.C

@@ -115,7 +115,11 @@ void SynthModular::ClearUp()
 	for(map<int,DeviceWin*>::iterator i=m_DeviceWinMap.begin();
 		i!=m_DeviceWinMap.end(); i++)
 	{
-		if (i->second->m_Device->Kill());
+		//Stop processing of audio if any
+		if (i->second->m_Device)
+		{
+			if (i->second->m_Device->Kill());
+		}			
 		i->second->m_DeviceGUI->Clear();
 
 		if (i->second->m_DeviceGUI->GetPluginWindow())