On my StudioLive 32SX, I have an analog input (computer audio) coming into inputs 31 & 32 on the back of the console.   I am assigning these to channel strips 3 & 4.   On ch. 3 &4, I have assigned it to see the analog input from 31 & 32.    HOWEVER, my input is still assinged to channel strips 31 & 32, and is only being controlled by the channel strip 31 & 32, and not by the assigned channels 3 & 4.     When I route those inputs to channel  3 & 4, what do I need to do with channel strips 31 & 32 so they are controlled in the right spot.  
This was working for me earlier, but now it's not...