SCM tremolo_symbol = ly_symbol2scm ("TremoloSpanEvent");
SCM start_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (START));
unsmob_music (start_event_scm)->set_spot (*origin);
SCM tremolo_symbol = ly_symbol2scm ("TremoloSpanEvent");
SCM start_event_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tremolo_symbol, scm_from_int (START));
unsmob_music (start_event_scm)->set_spot (*origin);