typedef struct tagMIXERLINECONTROLSA {
    DWORD           cbStruct;       
    DWORD           dwLineID;       
    union {
        DWORD       dwControlID;    
        DWORD       dwControlType;  
    };
    DWORD           cControls;      
    DWORD           cbmxctrl;       
    LPMIXERCONTROLA pamxctrl;       
} MIXERLINECONTROLSA, *PMIXERLINECONTROLSA, *LPMIXERLINECONTROLSA;

typedef LPMIXERLINECONTROLSA LPMIXERLINECONTROLS;