Traktor + djm 900 nexus ( streaming issues )

 Please help !!!

When I try and do live mix for radio show using traktor through djm 900 nexus and winamp , when I select 900 nexus asio in shared mode it just gives L and R in output routing rather than 1 ,2 , 3 , 4 etc  and only plays through one channel of mixer . Have read loads online and tried everything . Can anyone shed some light on this much appreciated