If you are using fixed faders for your mAirList channels (you don‘t move them around with channel assign), it‘s just easier to work with the fader numbers.
If you want to use Audio IDs (which I never tried myself), you must use 0-63 for the physical inputs, and 64-127 for the MADI inputs.
So the first input on the first IO card is 0, second input on first IO card is 1 etc.