## MMPM/2 Device Driver Reference

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### MCI_AUDIO_CONTROL Field - sReturnCode

sReturnCode (SHORT) Used to return any error code. The defined values for this field are:

    AC_UNINITED  1           /* Device must be initialized or loaded first */

    FULL_QUEUE   2           /* Max. number of requests exceeded */

    AC_UNPAUSED  3           /* Resume issued, but device not paused */

    INVALID_REQUEST      4   /* Bad MCI_AUDIO_CONTROL.usIOCtlRequest */

    AC_UNSTARTED         5   /* Device must be started first */

    INVALID_INPUT_LIST   7   /* Device in MCI_AUDIO_CHANGE.input_list is not

                                supported */

    INVALID_OUTPUT_LIST  8   /* Device in MCI_AUDIO_CHANGE.output_list is not

                                supported */