The following code illustrates using MCI_MIXSETUP to prepare the audio device for 16-bit, 22050 kHz, stereo mode.

    memset( &MixSetupParms, '\0', sizeof( MCI_MIXSETUP_PARMS ) );

  MixSetupParms.ulBitsPerSample = 16;
  MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
  MixSetupParms.ulSamplesPerSec = 22050;
  MixSetupParms.ulChannels = 2;  /* Stereo */
  MixSetupParms.ulBitsPerSample = 16;
  MixSetupParms.ulFormatMode = MCI_PLAY;
  MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;

   /* The mixer will inform us of entry points to */
   /* read/write buffers to and also give us a    */
   /* handle to use with these entry points.      */

  MixSetupParms.pmixEvent = MyEvent;

    rc = mciSendCommand( usDeviceID,
                     MCI_MIXSETUP,
                     MCI_WAIT | MCI_MIXSETUP_INIT,
                     ( PVOID ) &MixSetupParms,
                     0 );