Im using Fireface uc on my sony z115 i5 520m lap with windows 7 64bit. Its showing asio usage very high on cubase 5 and Nuendo 4. Also its showing Fireface uc 10% when its not using. It can run but cannot be happen in considering to this kind of requirement.The firmware and the driver is the newest.(Windows PnP driver for Fireface UFX, Fireface UC and Babyface, version 0.984.        Windows Flash Update Tool for Fireface UFX, UC, Babyface. Update to firmware revision UFX: 351/139/340, UC: 115, Babyface: 184. )
And When I plugged in a USB device(such as a USB flash drives),the Fireface UC stop works!... I don't know what happens...