HD OMNI on Windows 8.1 with Asio Driver

Hi



I´m trying to use my HD Native Omni System with Cubase 8 on Windows 8.1



But i have problems that i can´t change Buffer Size, sample rate etc. in Cubase



it always jumps back to 44.1 and a buffer size of 1024



anyone using this system sucessfully? If yes, whta Hd Driver are you using?



Thanks Guys for any suggestions..