Only default mute sounds in debug.

main.cpp

@@ -15,7 +15,8 @@ int main(int argc, char* argv[]) {
     animation::init();
     shaders::init();
 
-    sound::mute(true);
+    if(DEBUG_BUILD) sound::mute(true);
+
     gui::FSM main;
     main.event(gui::Event::STARTED);
     Autowalker walker(main);