typedef struct wavefilter_echo_tag {
        WAVEFILTER      wfltr;
        DWORD           dwVolume;
        DWORD           dwDelay;
} ECHOWAVEFILTER;

typedef ECHOWAVEFILTER       *PECHOWAVEFILTER;

typedef ECHOWAVEFILTER NEAR *NPECHOWAVEFILTER;

typedef ECHOWAVEFILTER FAR  *LPECHOWAVEFILTER;