function calculate(clip) {
  var i, saveDur, saveDurB, saveDurE;
  var lines = new Array(), result = new Array();  
  lines = clip.split("\r\n");

  for (i=0; i < lines.length; i++) {
      result=lines[i].match(/(.*Dur:)([^\|]*)(.*$)/);
	  if (result == null)
		  continue;  // No duration, didn't follow grace note.
	  if (lines[i].indexOf("Grace") > 0) {  // Found a grace note/chord
        continue;  }
	  if (lines[i].indexOf("Rest") > 0) {  // Found a rest, ignore
        continue;  }
	// shell.popUp(lines[i]);
	saveDur = result[2];
	//shell.popUp(saveDur);
	saveDur = saveDur.replace("32nd","64th");
	saveDur = saveDur.replace("16th","32nd");
	saveDur = saveDur.replace("8th","16th");
	saveDur = saveDur.replace("4th","8th");
	saveDur = saveDur.replace("Half","4th");
	saveDur = saveDur.replace("Whole","Half");
	shell.popUp(saveDur);
   // thisDur = getNoteLength(saveDur);
   	// shell.popUp(saveDur);
	// Code to manipulate durations goes here
	saveDurB = saveDur.replace("=End",""); // In case of triplets.
	saveDurE = saveDur.replace("=First",""); // In case of triplets.
	lines[i] = "|Rest|Dur:" + saveDurB + "\r\n" + result[1] + saveDurE + result[3];
    } 
  return lines;