2 sounds cards

Ok guys here's my problem. I have 2 sets of speakers one is regular speakers and the other one is headphones (Zalman Theatre 6) but it doesn't what speakers I have. So here's my problem I want to be able to play from both of the speakers at the same time my zalmans are 5.1 so they take up 3 holes in there and logitech are 2.1 they take up only 1 hole in there but that one hole is the hole that get taken over by zalman's. Lol ok so I wanna be able to play from both of them at the same time. So here's what I did since I have a fairly good asus mobo it has a "crappy" built in sound card in there so I put my 2.1 speakers in there. And it works fine but, windows MAYBE can't send music to two of my sound cards? So what I think I need to do is have some way to tell windows to play from 2 sound cards at one time which will be a crappy idea lol OR better idea to have my whooping Audigy 2 produce music from both of my speakers. Please help me how do I do that.

IT'S NICE TO BE IMPORTANT, BUT ITS MORE IMPORTANT TO BE NICE.................