+
+ now_mom_.set_infinite (-1);
+ prev_mom_.set_infinite (-1);
+
+ /* We only need the most basic stuff to bootstrap the context tree */
+ event_source ()->add_listener (GET_LISTENER (create_context_from_event),
+ ly_symbol2scm ("CreateContext"));
+ event_source ()->add_listener (GET_LISTENER (prepare),
+ ly_symbol2scm ("Prepare"));
+ events_below ()->register_as_listener (event_source_);