The seller is perfect communication level but the manufacturer him ... Now the drivers are not (in contrast to the description supplied in the box) on a CD but for download. The drivers have not been updated to Windows 8 so that most of the features are inaccessible. It's more than a shame especially as the Behringer contact form gives an automatic reply informing me that my request is taken into account ... But it lasts, it lasts ... It is as long a song of Carla Bruni and unpleasant ...