I tried every way, but no signal on input in USB mode
I'm waiting for the guy from Reloop to reply.
Other than, I disabled every windows managed driver, like standard MIDI and WDM driver just to try if it works... nothing (Windows can't use it in WDM mode).
But not working...
(and the manual doesn't say anyting about it).
Update: It seem that a lot of users have the same type of problem that I have, but Reloop says they are working on it...
Also it seems the mixer is Traktor only... I mean everything works but only on tractor...
Reloop can suck my USB
c00l People MV Society 
