Waiting for the audio to finish playing before auto-destructing an object

An event might occur (such as an object pickup or the killing of an enemy) that we wish to notify the player of by playing an audio clip and an associated visual object (such as an explosion particle system or a temporary object in the location of the event). However, as soon as the clip has finished playing, we will want the visual object to be removed from the scene. This recipe provides a simple way in which to link the ending of a playing audio clip with the automatic destruction of its containing object.