Only audio interfaces connected to the core card e.g., Mix Core, d24, or Disk I/O appear in the "I/O Labels" dialog. "Farm I/O" refers to cards other than the first (or "engine") card. To view audio interfaces connected to the Mix Farm, DSP Farm or Mix I/O select the radio button "Farm I/O". You do not have the option under "Farm I/O" to have different labels for "Input" and "Output" as with audio interfaces connected to the core card.