After reading manual a little bit.. I found out there is a "hidden" menu, which is not visible in the setup menus. I hate this kind of "hidden" things you must read the manual for, if it wasn that it was hidden I would had solved the problem first night.  Anway when you press the "program" button for more then 1 second a "routing" menu will appear, I did choose "Dual Analog" in this menu which should be correct since I use a stereo pair of analog input from my kemper, after I did this simple click now I did instantly hear the processed sound and wet signal not only dry signal as before. 

The EXT light is no longer flashing but heaing a steady flash which mean I can relax because that indicate there is no clocking or cable problem.. Feels nice!