routing audio outputs

i posted before about how id like to run some pre recorded audio through analog gear i have. now that ive figured out how to do it, i dont see certain options that i need to do it in audition. im using a presonus studiolive 24.4 mixer.  what i need to do is route the output of the track with the audio on it from a spare output on my mixer. and send it back to a completely different track. however, my issue is, none of the outputs on my mixer actually show up in auditions output list. only the inputs like 1-24. i have 10 aux outputs on the mixer that i can use to send audio to my analog gear, but i cannot access them from audition....is there something im doing wrong?