Fixed duplicate controllers issue

src/core/preset_preview_play_handle.cpp

@@ -258,12 +258,7 @@ ConstNotePlayHandleList presetPreviewPlayHandle::nphsOfInstrumentTrack(
 
 bool presetPreviewPlayHandle::isPreviewing()
 {
-	bool ret = s_previewTC->m_dataMutex.tryLock();
-	if( ret == true )
-	{
-		s_previewTC->m_dataMutex.unlock();
-	}
-	return ret;
+	return s_previewTC->isPreviewing();
 }
 
 

src/core/song.cpp

@@ -1500,6 +1500,13 @@ void song::removeController( Controller * _controller )
 
 
 
+
+bool song::isLoadingProject()
+{
+	return m_loadingProject;
+}
+
+
 #include "moc_song.cxx"