dspMixFx for iPad

Hello:

I have a UR44 and ipad4 with iOS 8.0.2 and dspMixFx installed, but I can not control my uUR44 from ipad.
All cables I use are good quality (not imitation).
When I connect the two devices and open the dspMixFx application, the USB icon at the top right corner flashes continuously. And not sound or changes I make in the app are appreciated.
The signal from my keyboard enters for channels 1 and 2 with a mono jack in each, and the red LED flashes in both. But I can not make it work.

Any idea how to fix this?
Thank you!