To use the P16Ms when plugged into the S16 ultranet port, you will need to assign the P16 channels. First, verify that you have the proper connections of AES50A on the X32 to AES50A of the S16 (and AES50B of the first snake to AES50A of the second snake if you are using two). Then go to the AES50A tab of the Routing page of the X32. Assign the columns Output 33-40 to P16 1-8 and Output 41-48 to P16 9-16.