typedef struct wavefilter_tag {
    DWORD   cbStruct;           
    DWORD   dwFilterTag;        
    DWORD   fdwFilter;          
    DWORD   dwReserved[5];      
} WAVEFILTER;

typedef WAVEFILTER       *PWAVEFILTER;

typedef WAVEFILTER NEAR *NPWAVEFILTER;

typedef WAVEFILTER FAR  *LPWAVEFILTER;