I have GPO installed, didn't have any problems installing it...
But now finally installed, all the instruments are played (stand alone, in sibelius and in cubase) a half step higher then they should sound. (c is played on the keyboard and you here c sharp)
I have other sound applications(vsti) who make use of the same asio drivers who dont have this problem so i doubt its the driver or sound card.
On the kontakt keyboard the tune knob is set to 0.