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.

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