Im still struggling with this. Since having originally got it working, i have only since managed to get the CDJs working with sound being handled by the DB2 for a maximum of about 20 seconds, before it stops.
The frustrating things is with each button press on the CDJ the corresponding button lights up on Cross - but then no action/sounds.
The only thing I can think is that my laptop is Win7 Pro 64bit, Cross only seems to work on 32bit with cdjs and the DB2 has 64 bit driver (32bit wont install). Its doesnt explain that it did works, but now doesn't
PS If I switch to internal sound the CDJs work straight away, if i flip back to DB2 it stalls.