typedef struct wavefilter_volume_tag {
        WAVEFILTER      wfltr;
        DWORD           dwVolume;
} VOLUMEWAVEFILTER;

typedef VOLUMEWAVEFILTER       *PVOLUMEWAVEFILTER;

typedef VOLUMEWAVEFILTER NEAR *NPVOLUMEWAVEFILTER;

typedef VOLUMEWAVEFILTER FAR  *LPVOLUMEWAVEFILTER;