/* call-seq:
 *  close_audio()
 *  
 *  Close the audio device being used by the mixer. You should not use any
 *  mixer functions after this function, unless you use #open_audio() to
 *  re-open the audio device. See also #open_audio().
 *
 *  Returns nil.
 */
VALUE rbgm_mixer_closeaudio(VALUE module)
{
  Mix_CloseAudio();
  return Qnil;
}