Problem with my virus TI desktop

  • hi everybody,


    I have just installed and connect my virus ti 2 desktop ,


    i use cubase 6 , the real one , not a crack with foscusrite saffire .


    I have installed the latest version of the virus soft but i have little "crack" in my sound .


    i try all different buffersize but this crack is always here .


    I really don't know how to do .


    sorry for my english , i'm french .