This message notifies an application of every mixer attribute change if the application registers for the event. When a mixer attribute is changed, an MM_MCIEVENT message is sent to the requesting application.

ulParam1 (ULONG)

The following flags can be used with an amplifier-mixer device.

MCI_NOTIFY

A notification message is posted to the window specified in the hwndCallback parameter of the data structure identified by pParam2 when the action indicated by this message is completed.
MCI_WAIT
Control is not returned until the action indicated by this message is completed.
MCI_MIXNOTIFY_ON
Turns mix notifications on. A valid window handle must be specified in the hwndCallback field of MCI_GENERIC_PARMS. If an invalid handle is specified, MCIERR_INVALID_CALLBACK_HANDLE will be returned.
MCI_MIXNOTIFY_OFF
Turns mix notifications off.

pParam2 (PMCI_GENERIC_PARMS)

A pointer to the MCI_GENERIC_PARMS data structure.

rc (ULONG)

Return codes indicating success or type of failure:

MCIERR_SUCCESS

Command completed successfully.
MCIERR_INVALID_DEVICE_ID
Invalid device ID given.
MCIERR_MISSING_PARAMETER
Required parameter is missing.
MCIERR_INVALID_FLAG
Invalid flag specified for this command.
MCIERR_UNSUPPORTED_FLAG
Flag is not supported by this device.
MCIERR_INSTANCE_INACTIVE
The device ID is currently inactive. Issue MCI_ACQUIREDEVICE to make device context active.
MCIERR_INVALID_CALLBACK_HANDLE
Given callback handle is invalid.

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