problem mixing in ableton!!!

hy..i have a little problem in ableton live 5...
the thing is i have a creative sound blaster live 24! which is a 7.1 sound card but in abletons output config it only shouws me 1(mono) & 2(mono) 1/2(stereo)....even if i set the speaker settings to 4.1 or above.... shouldn't i have more channels like 3/4 5/6 in the abletons output config?? what am i doing wrong??