The following example illustrates how an application can set up notification for every audio attribute change.

MCI_GENERIC_PARMS  mixevent;

mixevent.hwndCallback = hwndMixer;

if (hMixer)
  {
  mciSendCommand(hMixer,
  MCI_MIXNOTIFY,                   /* MCI mixer message */
  MCI_WAIT | MCI_MIXNOTIFY_ON,     /* Flags for this message */
  (PVOID)&mixevent,                /* Data structure */
  0);                              /* No user parm */