typedef struct tagMIXERCONTROLA {
    DWORD           cbStruct;           
    DWORD           dwControlID;        
    DWORD           dwControlType;      
    DWORD           fdwControl;         
    DWORD           cMultipleItems;     
    CHAR            szShortName[MIXER_SHORT_NAME_CHARS];
    CHAR            szName[MIXER_LONG_NAME_CHARS];
    union {
        struct {
            LONG    lMinimum;           
            LONG    lMaximum;           
        };
        struct {
            DWORD   dwMinimum;          
            DWORD   dwMaximum;          
        };
        DWORD       dwReserved[6];
    } Bounds;
    union {
        DWORD       cSteps;             
        DWORD       cbCustomData;       
        DWORD       dwReserved[6];      
    } Metrics;
} MIXERCONTROLA, *PMIXERCONTROLA, *LPMIXERCONTROLA;

typedef PMIXERCONTROLA PMIXERCONTROL;