UR28m no sound while connecting 2 device via iPad

Hi, I just bought UR28m and tried to connect it to iPad 3 via CCK. It works perfectly, but the problem appeared when I tried to using 2 device via USB hub (in this case I used nanopad2 via Belkin powered hub). Nanopad was detected and worked perfectly, UR28m detected but no sound. Sound output still came from main speaker. I checked it via Dspmix app and UR28m was detected.

My spec --------> UR28m + nanopad2 > Belkin powered USB hub > Apple CCK > iPad 3

Does firmware 2.1.1 will fix this issue?

Can anyone help me?
*Sorry for my English.

Thank You