Moment start_mom = 0;
for (vsize i = 0; i < audio_elements_.size (); i++)
if (Audio_item *item = dynamic_cast<Audio_item *>(audio_elements_[i]))
Moment start_mom = 0;
for (vsize i = 0; i < audio_elements_.size (); i++)
if (Audio_item *item = dynamic_cast<Audio_item *>(audio_elements_[i]))