anchor.diff:  $(document).ready(function() {
     $('#wfcb').click(function() {
       toggleWaveform('#wfcb', '.wave');
  +    update_sel_data();
     });
     $('#fmcb').click(function() {
       toggleWaveform('#fmcb', '.fmt');
  +    update_sel_data();
     });
     $('#ptcb').click(function() {
       toggleWaveform('#ptcb', '.pitch');
  +    update_sel_data();
     });
   });
   </script>
  
positive.code:     if (show_min) stats_str.push('min');
      if (show_avg) stats_str.push('avg');
      if (show_max) stats_str.push('max');
      if (pitch_sel.length > 0 && stats_str.length > 0) {
        avg_data += 'Pitch (' + stats_str.join('/') + '): <span style="width: auto; color: black">' + stats(pitch_sel) + '</span>';
      }
      formants_sel = formants.filter(function(el, idx) { return idx >= startX && idx <= stopX; });
      if (formants_sel.length > 0 && stats_str.length > 0) {
        f0_sel = formants_sel.map(function(el) { return el[0] });
        f1_sel = formants_sel.map(function(el) { return el[1] });
        f2_sel = formants_sel.map(function(el) { return el[2] });
  
negative.code:     show_min = $('#show-min').prop('checked');
      show_avg = $('#show-avg').prop('checked');
      show_max = $('#show-max').prop('checked');
      show_fmt = $('#fmcb').prop('checked');
      show_pitch = $('#ptcb').prop('checked');
      var sum = function(a, b) { return a + b; };
      var min = function(a, b) { return Math.min(a, b); };
      var max = function(a, b) { return Math.max(a, b); };
  