Behringer Xenyx Q502 USB - driver problems

Any idea why there are cracklings (echo like) when I use the mix console as external audio interface?
It worked once, then I tried to use usb piano keyboard and messed the driver and settings (to lower the latency)
Then I switched to the onboard audio and actually forgot about the problem..

Now I am trying to use the console like audio interface (just for listening online music) and cannot set it back.
Cant find specific behringer driver, the problem is both if I use 44.1 and 48k rate.