transparent property will cause an object to be printed
invisible ink: the object is not printed, but all its other
behavior is retained. The object still takes up space, it takes part in
collisions, and slurs, ties and beams can be attached to it.
This snippet demonstrates how to connect different voices using ties. Normally, ties only connect two notes in the same voice. By introducing a tie in a different voice, and blanking the first up-stem in that voice, the tie appears to cross voices.