Cubase 6.0

I have a Mac powerbook with 10.11 and a focusrite scarlett 2I4 first gen audio card and i am running Cubase 6.0 i can’t get them to work i get a distorted sound and the inputs meters go to red and stay even if i move the slider.Cubase reads the asio driver of the scarlet 2I4 The mac audio core also … and if i connect my mp3 player to the audio card
the sound if fine the problem is between Cubase and the audio card … i need some help anybody? thanks SAL