If a sound within a continuous container falls below the volume
threshold and the option is set to Kill voice, only the current sound
is killed, and not the container itself. When the current voice is
killed, the next voice scheduled to play will be tested to see if its
volume is below the threshold. It will continue to test each voice
until it reaches one that is over the volume threshold or until it
reaches the last voice in the container. If the container is set to
infinite looping, the sound engine will continue testing voices until
it finds one with a volume above the volume threshold. When it does,
this voice will begin to play.