state save/load working! signal pause/play button added, and speed control is now better.

src/graph-manager.h

@@ -159,7 +159,7 @@ namespace VISEQ::GRAPH {
 			void splitEdges(){
 				for(auto s : split_edges){
 					Vec2Df center = s->end->position.center(s->start->position);
-					SPTR_Node cn = addMidiNode(center);
+					SPTR_Node cn = copyNode(std::dynamic_pointer_cast<MidiNode>(s->start), center);
 					addConnection(s->start, cn);
 					addConnection(cn, s->end);
 					remove_edges.push_back(s);