tracks/app/views/notes/destroy.js.erb

remove_deleted_note();
TracksPages.set_page_badge(<%=@down_count%>);
TracksPages.page_notify('notice', "<%=  t('notes.deleted_note', :id => @note.id)%>", 5);

function remove_deleted_note() {
  $('div#note-<%=@note.id%>-wrapper').slideUp(1000,
    function() {
      $('div#note-<%=@note.id%>-wrapper').remove();
    });
}