ahha i just found out that when i press "mode" and "X" button from my wheel and turn the wheel it adjusts my virtual dj volume thing D
this is damn good! I've waited for some program that could adjust the virtual dj sound via g15 thing but there isnt any :P

I have joytech nitro triforce which sucks, now i have one good thing in this wheel !
E: only x is enough to adjust