Hi

obviously I'm on a PC.

Did it ever recognise you unit?
-try uninstall reinstall the drivers.
- try a different usb port

mine recognises it

but sometimes on laptop boot, if i launch traktor, it says no audio

i restart traktor and or flick the on off switch at the back of the unit.

and i always try to user the same usb port and cable.

I've got in the habit of looking for the no audio sign on starting traktor.