Streaming at multiple bit rates

[Sodathief]

Hi, i am running a audio server for a college campus radio.
I know how to stream one 24kbps stream. and i know to stream another i have to change the ports in the dnas.
but my problem is listing two ports in the dnas if my port base is 8000 how do i make it say that my port base is 8000 and 8002? possibly portbase=8000,8002 ???? that didnt work. can sombody help me please? thank you.