+
+void
+Performer::acknowledge_element (Audio_element_info)
+{
+}
+
+void
+Performer::process_acknowledged ()
+{
+}
+
+
+void
+Performer::announce_element (Audio_element_info i)
+{
+ i.origin_trans_l_arr_.push (this);
+ daddy_perf_l()->announce_element (i);
+}