/**
  * Creates a new Command that can bar line shift a melody part.
  *
  * @param source the Part to paste
  * @param startSlot the slot to start pasting over in the dest
  * @param stopSlot the slot to end pasting over in the dest
  * @param direction the direction ("up" or "down") to transpose the second half
  * @param distance the number of half steps to transpose the melody
  * @param keySig the key signature that the solo is being played in
  * @param cm the command manager used
  */
 public SideSlipCommand(
     MelodyPart source, String direction, int distance, int keySig, CommandManager cm) {
   this.source = source;
   this.dest = source.copy();
   this.original = source.copy();
   this.direction = direction;
   this.distance = distance;
   this.keySig = keySig;
   this.cm = cm;
 }