Installing Soundblaster card

Hi all,
I have optiplex SX with an integrated soundmax audio card. I want to install soundblaster so I can use soundfonts from Sonic (this works in music sequencing software). I actually opened up the pc box over the weekend and haven't a clue where the soundcard would go. I'm afraid to know, is there no available slot to add a card since the soundmax is integrated on the motherboard? (Boy, I sure wish I did more research in this area before I bought the optiplex.)

Any response most appreciated!! : )

Webgab
http://www.soundclick.com/webgab