added guard so that TTS voices are only loaded once, if present in multiple search paths

src/Audiosignals/VATextToSpeechSignalSource.cpp

@@ -463,8 +463,14 @@ void CVATextToSpeechSignalSource::TTSEngine::Init(){
 				VA_WARN("CVATextToSpeechSignalSource", "The associated license file ("+licence_file+") does not exist, cannot load voice");
 				continue;
 			}
+
+			if (m_loadedVoices.find((*it)->GetLocalName()) != m_loadedVoices.end())
+				continue; //so we do not load the same voice multiple times if it is in multiple directories in which we search
+
 			CPRCEN_engine_load_voice(m_pTTSEngine, licence_file.c_str(), NULL, name.c_str(), CPRC_VOICE_LOAD);
 			VA_INFO("CVATextToSpeechSignalSource", "Loaded voice \"" + name + "\"");
+
+			m_loadedVoices.insert((*it)->GetLocalName()); 
 		}
 	}
 

src/Audiosignals/VATextToSpeechSignalSource.h

@@ -11,6 +11,8 @@
 #include <ITAAudioSample.h>
 #include <ITAAtomicPrimitives.h>
 
+#include <unordered_set>
+
 class ITABufferDatasource;
 class CVACoreImpl;
 class CPRCEN_engine;
@@ -103,6 +105,7 @@ private:
 		std::map<int, std::string> m_idToViseme;
 		float m_sampleRate;
 		std::vector<std::string> m_VoicePaths;
+		std::unordered_set<std::string> m_loadedVoices;
 	};
 
 	struct UserCallbackData{